has. Co( igur5 E F)Fi s Guid -- opt E l Statem78


Syntax

apt E s {
  [Svers8E  vers8E _ntr3
(; ]
  [Sdir Etorg paer_fes ; ]
  [Snes d-xfer paer_fes ; ]
  [Sdump-ail tpaer_fes ; ]
  [Smemstatis13cs-ail tpaer_fes ; ]
  [Spid-ail tpaer_fes ; ]
  [Sstatis13cs-ail tpaer_fes ; ]
  [Saur -nxrem639 yes_or_no; ]
  [Sdsain17 te-on-exit yes_or_no; ]
  [Sdialup yes_or_no; ]
  [Sfake-i15 Fy yes_or_no; ]
  [Sfetch-glue yes_or_no; ]
  [Shas-old-cli78 s yes_or_no; ]
  [Shost-statis13cs yes_or_no; ]
  [Shost-statis13cs-max fumber; ]
  [Smultiple-cfes s yes_or_no; ]
  [Sfotify yes_or_no; ]
  [Sr15uis8E  yes_or_no; ]
  [Srfc2308--ypr1 yes_or_no; ]
  [Sane-id-pool yes_or_no; ]
  [Strea5-cr-as-space yes_or_no; ]
  [Sal-.-fotify { ip_a5(i; [ ip_a5(i; ... ] }; ]
  [2at)w4rdS(tonloE|Sairst ); ]
  [2at)w4rders {4[ in_a5(i ;4[ in_a5(i ;4... ] ] }; ]
  [25heck-fes s ( mareer |tRlave |treupo(ueo) ( w4r(E|Saail2| ignor ); ]
  [Sallow-15 Fy { a5(ie t_m1tch_li 1 }; ]
  [2allow-transf56 { a5(ie t_m1tch_li 1 }; ]
  [2allow-r15uis8E  { a5(ie t_m1tch_li 1 }; ]
  [2blackhole { a5(ie t_m1tch_li 1 }; ]
  [2l
sten-on [Sp in ip_p in ] { a5(ie t_m1tch_li 1 }; ]
  [215 Fy-uourceo[ a5(ie t2( ip_a5(i2| *d) ] [Sp in ( ip_p in | *d) ] ; ]
  [2lame-ttl fumber; ]
  [Smax-transf56-tis -39 fumber; ]
  [Smax-ncache-ttl fumber; ]
  [Smin-roots fumber; ]
  [Sser al-15 F(r. fumber; ]
  [Stransf56-at)55 d(eon -answ/i)|.m6ly-answ/is ); ]
  [2transf56s-39  fumber; ]
  [Stransf56s-BIt fumber; ]
  [Stransf56s-p56-n. fumber; ]
  [Stransf56-uourceoip_a5(i; ]
  [SmaintaiF-ixfr-bas  yes_or_no; ]
  [Smax-ixfr-log-sizetfumber; ]
  [S5 resizetsize_w5 E ; ]
  [Sd1tasizetsize_w5 E ; ]
  [Sailes2size_w5 E ; ]
  [Sstacksizetsize_w5 E ; ]
  [Sclea( 
(-anfervaltfumber; ]
  [Sheartbea5-anfervaltfumber; ]
  [Sanferface-anfervaltfumber; ]
  [Sstatis13cs-anfervaltfumber; ]
  [Stopology { a5(ie t_m1tch_li 1 }; ]
  [2s inli 1 { a5(ie t_m1tch_li 1 }; ]
  [2rrset-order2{ order_w5 E
;4[ order_w5 E
;4... ] }; ]
};

Defi( tiE . leiUsage

Tceoapt E s statem78 srt. up globsitapt E s osbs anei by has.. Tcal2statem78 may ppear 51 anloSo8cee3 24 coy igur5 E FSail ; irvmore4fhan on taccurr nc. al2found, tm airst accurr nc. determines2theSactusitapt E s anei, andSa w4r( (owillsbs gen).1nid. If tc/is al2no apt E s statem78 , an apt E s bn17k gher nach)opt E set os3tsadefault willsbs anei.

Paerfes s

vers8E
TheSvers8E tc/ sr ser2sh F2 .report viastc/2ndE 5 mma6 rw2viasa 15 Fy of nes tvers8E .bindian2cla t chaos. TheSdefault is2tc/ real vers8E numberiofitc/ sr ser, 5u1 Ros tsr ser ov).15orl2d ef56itc/ str3 (i"sur y orwam2to be jok3 (".
dir Etorg
TheSw2.5 ( dir Etorgiofitc/ sr ser. iAny fon-absolut paerfes sSinStm 2coy igur5 E FSail twillsbs taken as rel15ia) fo.esis dir Etorg. Tm tdefault n17 t E at) moto se ser Butput.ailes (e.g.o"nes d.run") is2tcis dir Etorg. Ifsa4dir Etorgial2nse s5 E fied, thesw2.5 ( dir Etorgtdefaults os".", tm trir Etorgtai)-.whichttce er ser was start21. Tm tdir Etorgts5 E fiedSsh F2 .b24an absolut paer.
nes d-xfer
TheSpaerfes to2tc sfes d-xfer program2t2at tc/2er ser us6s)orw inbound1zB-. transf56s. Ifsnsess5 E fied, thesdefault is Rystrm4dependrntS(e.g.o "/usr/sbin/fes d-xfer").
dump-ail
TheSpaerfes arv-pe4file tc/2er ser dumpt tce2d1tabas .fo)when i rnceivesiSIGINT wignsit(ndc dumpdb). Ifsnse s5 E fied, thesdefault iso"nes d_dump.db".
memstatis13cs-ail
TheSpaerfes arv-pe4file tc/2er ser wri1es memorgtusage statis13cs to, B- exit, if2deain17 te-on-exit al2yes. Ifsnse s5 E fied, thesdefault iso"nes d.memstats".
pid-ail
TheSpaerfes arv-pe4file tc/2er ser wri1es 3tsap uce tvI. 3-. Ifsnse s5 E fied, thesdefault isoov).158 (tRystrm4dependrnt, 5u1 al2anusilo "/var/run/nes d.pid" or "/etc/nes d.pid". Tm tpid-ail tal2anei.by program.Slike "ndc" es51 wa8 .fo.se6 tsignals to2theSrun( ( fes .r ser.
statis13cs-ail
TheSpaerfes arv-pe4file tc/2er ser appends statis13cs to)when i rnceivesiSIGILL wignsit(ndc stats). Ifsnse s5 E fied, thesdefault iso"nes d.stats".

Boolea( Opt E l

aur -nxrem639
If yes,.ese2AA 5at al2alwayl2set on NXDOMAINtreupo(ues,eea)e2if tc/ sr ser2al2nsesactusilotaur or ta Ea). TheSdefault is2yes. Do not turn aff aur -nxrem639vanle tvorwa4r Esur vorwaknowvwp51 orwa4r do3 (, 5s sos alder2Roftw4r Ewon'talike it.
deain17 te-on-exit
If yes,.ese2wisver2whlitpains a5 (lotdeain17 te na)rg obj Et i it ae n7 tei,)when i exits, a6 .th)e5wri1e.a memorgtusage report to ese2memstatis13cs-ail . Tm tdefault is2no,.becaIse at al2fareer fo.litStc sov).158 (tRystrm4clea( up. deain17 te-on-exit al2handy at) detecti (Sm6morgtleaks.
dialup
If yes,.ese2wisver2trea5s ae zB-.s as irv-pey are do3 (1zB-. transf56ssacross aSdial B- dema6 odialup link,vwhichtcha be brBIght up by traff cSor g3 158 (tai)-.-pal2se ser. iTcal2has diff56rntSeff56tlr c5 rd3 (ieo1zB-. typr 46 tco8ceneri1es2theSzB-. m639ten58ceesoS-pat it ae 2happen. in)atshortoanferval,So8ceena)rg heartbea5-anferval a6 ohov)fuilotdur3 (ies sB-. call. ItSal-. suppie tes sos af tc/ nt)55 zB-.SmaintaiF58ceetraff c. TheSdefault is2no. Tm tdialup opt E may l-. 5 Fw5 E fiedSinStm tzB-. statem78 ,SinSwhich cas .it oa)rrides2theSopt E l dialup statem78 .

If tc/ zB-. al2asmareer zB-.,.ese2wisver2whlitse6 tBut NOTIFYoreques foSall tcetRlaves. iTcal2whlittrigg7r2tce2"zB-. up to d1tiv5heck3 ("SinStm tRlave (d uvid3 (iit supp insSNOTIFY), ae nwiie thesslave osv F(fy tc/ zB-. whil ethescalltus up.

If tc/ zB-. al2asslave or)stub zB-.,.ese2wisver willssuppie t2tc/ regularE"zB-. up to2d1ti")15 F(r. a6 oanloSv). -.5 es m when thesheartbea5-anferval expires.

fake-i15 Fy
If yes,.ese2wisver2whlitsimul1ni tc/ obsolete DNS 15 Fy typr IQUERY. Tm tdefault is2no.
fetch-glue
If yes (thesdefault),.ese2wisver2whlitfetch "glue" reuource r15 rd. ittdoesn'tahave2when co(utruct3 (ies saddit E si d1ta)sict E ar atreupo(ue. fetch-glue no2chan5 Fanei 39 co(junc E Ftgher r15uis8E no2to prea)etttc swisver's cachetai)-.growiie.or bs6om3 (t5 rruptei (at tc/25 at of requir g more4w2.5 ai)-.-petcli78 ).
has-old-cli78 s
Setf3 (ies sopt E to yes al2equival78 .fo2setf3 (ies sahe nwiie apt E s: aur -nxrem639 yes; a6 orfc2308--ypr1 no;. Tm tIse arvhas-old-cli78 sswher aur -nxrem639 a6 orfc2308--ypr1 iseorder2dependrnt.
host-statis13cs
If yes,.statis13cs aae.k6pt4fo) na)rg host2t2at tc/ es sfes .r seroanfera6tlrwher. Tm tdefault is2no. Not6: turn3 (ion host-statis13cs2chanco(uus huge amountt of.m6morg.
host-statis13cs-max
TheSmax mum4numberiofihost2r15 rd. s51 willsbs k6pt. When this limi52is reachei no newth at. willsbs ddrd to2tc shost2statis13cs. If tc/ srt oszero es nS-peis al2no limi52srt. Tm tdefault value il2zero.
m639taiF-ixfr-bas
If yes,.a transact E logtis k6pt4fo) Increm78 si ZB-. Transf56. Tm tdefault is2no.
multiple-cfes s
If yes,.multiplesCNAME r1uourceor15 rd. willsbs e nw (dorw)atrem639 nes . Tm tdefault is2no. Ae nwiie multiplesCNAME r15 rd. is agains 2staleaFds a6 tal not r15 mm78drd. MultiplesCNAME supp in is avail5ble.becaIse preaioustvers8E s arvhas. e nw (dmultiplesCNAME r15 rd., a6 .th)seor15 rd. have2be)e5anei at) load bal58c3 (tbota4numberiofisitis.
notify
If yes (thesdefault),.DNS NOTIFYom6ssage. are)se8 .when a zB-. tc/ sr ser2al2aur or ta Ea) at) changes. Tm tIse arvNOTIFY s5 dl2co(serg nc. between thesmareer a6 .itstRlaves. iSlave srsvers th51 rnceiveta4NOTIFYom6ssage, a6 .undrrstale.it,)willsco8 sct tc/ mareer sr ser2at) tm tzB-. to.see irv-pey ne d to2dosa4zB-. transf56. If -pey do,des ySwillsiFit steoit2imm7d(at y. Tm tnotify opt E may l-. 5 Fw5 E fiedSinStm tzB-. statem78 ,SinSwhich cas .it oa)rrides2theSopt E l notify statem78 .
rn5uis8E
If yes,.andSa DNS 15 Fy reques svrn5uis8E ,ttce er ser willsattempt to2dosall tcetw2.5 requirei to answ/i)tcet15 Fy. If r15uis8E al not on,v-pe4se ser willsreturn a ref56rsi fo.ese cli78 irvat doesn'taknowves sansw/i. Tm tdefault is2yes. See l-. fetch-glue abBve.
rfc2308--ypr1
If yes,.ese2wisver2whlitsele NSor15 rd. along wher tce2SOA r15 rd ao) negi1ia) answ/is. You ne d to2witStcis to2no5irvorwahave2an oldShas. er ser us3 (torwa4l2asat)w4rder s51 does not undrrstale.negi1ia) answ/is whichtco8 sinSboer SOA ale NSor15 rd. orvorwahave2an oldSvers8E 4f selemail. TheSc rr Et fix iseto2upgrad. tc/ broken se ser Br selemail. TheSdefault is2no.
ane-id-pool
If yes,.ese2wisver2whlitkeep -ra6k 4f itstownoButstaleiie 15 Fy ID's foSavoid duplicatiE . leiincreas .ranremne t. iTcal2whlitr1uult inS128KB more4m6morgtbe3 (t5 (uus i by tc/2.r ser. TheSdefault is2no.
trea5-cr-as-space
If yes,.ese2wisver2whlittrea5 '\r'Echarac1ers2-pe4ses tway at trea5s a ' ' Br '\t'. Thal2m6y beonece targ when load g zB-. fileseon)at UNIXtRystrm4 s51 weis gen).1nid E . l NT Br DOS2m6c2 e. Tm tdefault is2no.

Al-.-Notify

al-.-fotify

Defi( s a globsitli 1iofiIP a5(ie tes2 351 4l-. get se8 .NOTIFYom6ssage. ws neser2asaie htcopgiofitc/ zB-. al2loaded. Tcal2helps foSensur v-pat cop e. of tc/ zB-.l2whlitquickly2co(serg E .``s alth'' srsvers. Ifsan al-.-fotifytli 1iis2gia)e539 a4zB-. statem78 , at whlitoa)rride2theSopt E l al-.-fotifytstatem78 . Whe9 a4zB-. notify statem78 2al2se .fo.no,. es sIP a5(ie tes2inStm tglobsital-.-fotifytli 1iwillsn-o get se8 .NOTIFYom6ssage.2at) tm51 zB-.. TheSdefault is2tc/ emptytli 1i(no globsitfotificatiE .li 1).

Ft)w4rd3 (

Tceoah)w4rd3 (efacility chan5 Fanei fo.crea5 aElarge4siti- d) cacheton)atfewtsrsvers,treiuc3 (ttraff cSoser2links foSexfer si fes .r sers. It2chanal-. 5 Fanei foSallowv15 F(r. by sesvers s51 do n-o have2d r Et c66ss to2theSInfer et, 5u1 wi htfo.l1ok up exferior fes .2anyway. Fo)w4rd3 (eaccurs anloSo8S-p ne 15 F(r. at) whichttce er ser is not aut or ta Ea) a6 odoes not have2-pe4answ/i)3 2ats cache.

ah)w4rd
This apt E iseonloSmea( (ful2if tc/ ah)w4rderstli 1iis n-o empty. A2value 4f first, thesdefault,scaus6sttce er ser fo.15 Fy tc/ at)w4rders first, a6 .if s51 doesn'taansw/i)tce ques 8E tc/ sr ser2whlitthen look at) tm tansw/i)3tself. If onlo ises5 E fied, thessr ser2whlitonloS15 Fy tc/ at)w4rders.
ah)w4rders
S5 E fies2theSIP a5(ie tes2 . 5 Fanei at) ao)w4rd3 (. Tm tdefault is2the emptytli 1i(no ao)w4rd3 ().

Ft)w4rd3 (2chanal-. 5 Fc ( igured E . Sv).-zB-. bau s, ae nwiieSorw .c tglobsitah)w4rd3 (eapt E s osbs oa)rridd)e539 a4vaFiety artways. You canSse .particularEzB-.l2to2use2diff56rntSah)w4rders, o) have diff56rntSah)w4rdtonlo/firsttbehav or, o) to2not ah)w4rd 51 4ll. See tc/ zB-. statem78 fah more4in -.55 E F.

Futur vvers8E s arvhas. 82whlitp uvide.a more4pow/iful2ah)w4rd3 ( Rystrm. Ts seyntax2describ (dabBve)willsco8 inue foS5 Fwupp inid.

Nes Check3 (

Ts ser ser25an 5heck rem639 nes s baue .upE tc/i) nxpec1ei cli78 coy exts. Fo) nxample,oatrem639 nes Fanei 4l2ashostnes Fchan5 F5heckei at) compli58ce wher tce2RFCsodefi( (ovalidvhostnes s.

Tsreiv5heck3 (.s tho1s ais avail5ble:

ignor
Nov5heck3 (.is dB-..
w4r(
Nes .2ar F5heckei agains 2tc/i) nxpec1ei cli78 coy exts. Invalidvnes .2ar logged, 5u1 d uce tiie.co8 inues nt)55 ly.
fail
Nes .2ar F5heckei agains 2tc/i) nxpec1ei cli78 coy exts. Invalidvnes .2ar logged, a6 .th) affend3 (id1ta)al2r1jec1ei.

Ts ser ser25an 5heck nes .2tcree2ar as:smareer zB-. files,tRlave zB-. files,t leiintreupo(ues fo.15 Fies2theSsr ser has iFit sted. If 5heck-fes s reupo(ueofailthas be)e5s5 E fied, a6 answ/i3 (ies scli78 's ques 8E w F2 .require send3 (ian anvalidvnes to2theScli78 ,.ese2wisver2whlitsele a REFUSED.rnupo(ueo5ode to.ese cli78 .

Ts sdefaults ar :

    check-fes s mareer fail;
    check-fes s Rlave w4r(;
    check-fes s rnupo(ueoignor ;

5heck-fes s m6y l-. 5 Fw5 E fiedSinStm zB-. statem78 ,SinSwhich cas .it oa)rrides2theSopt E l 5heck-fes s statem78 . When anei 39 atzB-. statem78 ,Stm tar aial2nse s5 E fied (becaIse it2chasbs deiucei ai)-.-petzB-. typr).

Ac66ss Coy rol

Ac66ss to2theSer ser25an bs restr3c1ei baue .E tc/ IP a5(ie t2ar the reques 8 (tRystrm. See a5(ie t_m1tch_li 1 at) details B- how to2w5 E fy IP a5(ie t2li 1s.

allow-15 Fy
S5 E fies2which h at. are2allnwed osask rd3 arg 15 s58E s. allow-15 Fy m6y l-. 5 Fw5 E fiedSinStm zB-. statem78 ,SinSwhich cas .it oa)rrides2the opt E l allow-15 Fy statem78 . Ifsnsess5 E fied, thesdefault is foSallowv15 F(r. ai)-.ae 2hos s.
allow-transf56
S5 E fies2which h at. are2allnwed osrnceivetzB-. transf56ssai)-.-pe se ser. iallow-transf56 m6y l-. 5 Fw5 E fiedSinStm zB-. statem78 ,SinSwhich cas .it oa)rrides2the opt E l allow-transf56 statem78 . Ifsnsess5 E fied, thesdefault iseto2allowvtransf56ssai)-.ae 2hos s.
allow-rn5uis8E
S5 E fies2which h at. are2allnwed osmake r15uis8ve.15 Fies2thrBIgh.esis se ser. iIfsnsess5 E fied, thesdefault iseto2allowvr15uis8ve.15 Fies2ai)-. ae 2hos s.
blackhole
S5 E fies2a2li 1iofia5(ie tes2 351 ese2wisver2whlitnsesaccep 215 Fies2ai)- rw2us .fo)r1uolveta415 Fy. Q5 Fies2ai)-.th)seoa5(ie tes2willsn-o be rnupo(drd to.

Inferfaces

TceSanferfaces a6 tp insS 351 ese2wisver2whlitansw/i)15 F(r.2ai)-.m6y 5 Fw5 E fiedSus3 (ttheSl sten-on opt E . il sten-on takel2an4opt E si4dort, a6 .a9 a5(ie t_m1tch_li 1. Ts seisver2whli l sten E . llsiFferfaces ae nw (dby es saddie t2m1tch2li 1. Ifsa4p in is nsess5 E fied, p in 53 willsbs anei.

Multiplesl sten-on statem78 . are2allnwed. Fo) nxample,

    l
sten-on { 5.6.7.8; };
    l
sten-on p in 1234 { !1.2.3.4; 1.2/16; };
willsen5ble.es sfes .r seroon p in 53 at) tm tIP a5(ie t25.6.7.8, a6 on p in 1234 ofsan a5(ie t2an thesmac2 eSinSne .1.2S-pat il2nse 1.2.3.4.

If nosl sten-on ises5 E fied, thessr ser2whlitl sten E .p in 53 E . llsiFferfaces.

Q5 Fy A5(ie t

If tc/ sr ser doesn'taknowves sansw/i foSas15 s58E , at whlit15 Fy or whsfes .r sers. 15 Fy-uource s5 E fies2theSa5(ie t a6 tp inFanei at) sucht15 F(r.. If a5(ie t is * or)iseomittei,)a whldc4rdSIP a5(ie t (INADDR_ANY) willsbs anei. If p in is * or)iseomittei,)a ranrem unprivileged p inFwillsbs anei. Tm tdefault is

    15 Fy-uourceoa5(ie t2* p inF*;

Not6: 15 Fy-uource curr ntngdapp ies onloSfoSUDPt15 F(r.; TCP)15 F(r. alwayl2us .a whldc4rdSIP a5(ie t.andSa ranrem unprivileged p in.

ZB-. Transf56l

max-transf56-tis -39
Inbound1zB-. transf56st(nes d-xfer2d uce t s)Srun( ( longwh than thal2m6nySminutes willsbs terminat21. Tm tdefault ise120 minutes (2 hrwrs).
transf56-at)55
TheSsr ser2supp insStwoozB-. transf56.s tho1s. on -answ/ivaseseon tDNS m6ssage2per2rnuourceor15 rd transf56red. m6ly-answ/is2dacks 4l2m6nySreuourceor15 rd. 4l2possible.39to2a m6ssage. m6ly-answ/is2al2more eff cirnt, 5u1 al2onloSknown2 . 5 Fandrrstoo(dby has. 8.1+ a6 tp1tched vers8E s arvhas. 4.9.5. Tm tdefault is2on -answ/i. transf56-at)55 2m6y be oa)rridd)e5E . Sv).-sr ser2bau s2byEan .g2thessr ser statem78 .
transf56s-39
TheSmax mum4numberiofiinbound1zB-. transf56sd.c51 c1n bs run( ( co8curr ntng. Tm tdefault value il210. Increas ( transf56s-392m6y s5 d up tm 2coyserg nc. 4f slave zB-.l, 5u1 i1 4l-. m6y increas .theSl1a .E tc/ n17 ltRystrm.
transf56s-BIt
This apt E willsbs aneid39 thesfutur vto limi52es sfumberiof co8curr ntoButbound1zB-. transf56s. I istcheckei at) eyntax, 5u1 al 4-peiwis6Signor d.
transf56s-p56-n.
TheSmax mum4numberiofiinbound1zB-. transf56sd(nes d-xfer d uce t s)S.c51 c1n bs co8curr ntng transf56r8 (tai)-.a2gia)e5remot6 fes .r ser. Tm tdefault value il22. Increas ( transf56s-p56-n.2m6y s5 d up tm 2coyserg nc. 4f slave zB-.l, 5u1 i1 4l-. m6y increas .theSl1a .E tc/ remot6 fes .r ser. transf56s-p56-n.2m6y bs oa)rridd)e5E . Sv).-sr ser2bau s byEan .g2thestransf56lsphras of tc/ sr ser statem78 .
transf56-uource
transf56-uource determines2which n17 lta5(ie t.willsbs bound to2theSTCP)coynict E anei foSfetch ae zB-.s transf56rediinbound1by es se ser. Ifsnsesse , at defaults osatRystrm4coy rollei value which whli anusilotbe es saddie t2afses/23Fferface ``closes fo'' tc/ remot6 eni. Tmal2addie t2m2to ppear in tc/ remot6 eni'siallow-transf56 opt E at) tm tzB-. be3 (ttransf56red,5irvB-. al2s5 E fied. Tcal2statem78 srt. thestransf56-uource orw)ae zB-.s, 5u1 chan5 Foa)rridd)e E . Sv).-zB-. bau s1by iFBold .g2a transf56-uource statem78 gheriF)-pe4zB-. bn17k inStm 2coy igur5 E FSail .
s1r al-15 F(r.
Slave srsvers2whlitp F(od csilot15 Fy mareer sr sers osfi6 tBut5irvzB-. s1r al4number. have2changed. Each)sucht15 FyvaseseaSminute amount2ar the slave srsver'l2netw2.5 ba6 width, 5u1 more4imp inantng nach)15 Fyvasesea s55 l amount2ar m6morgSinStm tRlave sr ser2whil ewaitiieSorwStm t mareer sr ser2fo)r1upo(d. Tm ts1r al-15 F(r.)opt E sets tc/ max mum4numberiofico8curr ntos1r al-numberi15 F(r. allnwed osbeoButstaleiie 51 4nySgia)e5tis . Tm tdefault is2four)(4). Not6: If a sr ser2l1a s aElarge4(ten. o) hundr dl2ar thousales)Snumberiofislave zB-.l, this limi52sh F2 .b24raisrd to2tc shigh hundr dl2ar2l1w thousales -- 4-peiwis6Stc sRlave sr ser2m6y neser2actusilotbs6ome aware)of zB-. changesSinStm tmareer sr sers. Beware, though,S.c51 setf3 (iesis limi5 arbitrarily2high canSspele a co(u drr5ble.amount2ar your)slave srsver'l netw2.5, CPU, a6 .m6morgtreuources. A. wher all tun5ble.limi5l, this B-. sh F2 .b24changed gentngda6 .monitor dSorwSats eff56tl.

ReuourceoLimi5l

TceSsrsver'l2usage of.m4nySRystrm4reuources chan5 Flimi5ed. Some ov).158 (tRystrmsadon'tasupp in sos af tc/ limi5l. On)suchtRystrms, a w4r( (owillsbs issued2if tc/ unsupp inidSlimi52is anei. Some ov).158 (tRystrmsadon'tasupp in limi58 (treuources, a6 oan.th)seoRystrms aoc1nnsesse Sreuourceolimi5loan.thal2systrm2m6ssage2will be logged.

Scsiei value. are2allnwed when s5 E fy3 (treuourceolimi5l. Fo) nxample,o1G2chan5 Fanei 39s ad)of 10737418242to s5 E fy aSlimi52orvB-. gigabyt . anlimi5ed2reques svanlimi5edFane, o) theSmax mum avail5ble.amount. default us6sttce limi52es5 was iF fahce when theser ser was start21. See size_w5 E fah more4details.

5 resize
TheSmax mum4sizetafsa4core4dump. Tm tdefault is2default.
d1tasize
TheSmax mum4amount2ar d1ta)m6morgttheser ser m6y us . Tm tdefault is default.
files
TheSmax mum4numberiofifilesetheser ser m6y have2ov)n co8curr ntng. TheSdefault is2anlimi5ed. Not6:oan.sos av).158 ( RystrmsatheSer ser25annsesse Sa( unlimi5edFvalue 46 tcannsesdetermine theSmax mum4numberiofiov)n filesethesker el canSsupp in. On)such Rystrms,4choos3 (ianlimi5ed2willscaIse ese2wisver2to2use tc slargeriofitc/ rlim_max fah RLIMIT_NOFILE a6 otce2value return (dby syscoy (_SC_OPEN_MAX). Ifstc/ actusitker el limi52is largerithan thal2value,Suse l mi5 files2to s5 E fy tce limi52explicitly.
max-ixfr-log-size
TheSmax-ixfr-log-size willsbs aneid39 asfutur vreleas of ese2wisver2to2limi52es ssizetafstm t transact E logtk6pt4fo) Increm78 si ZB-. Transf56.
stacksize
TheSmax mum4amount2ar stack)m6morgttheser ser m6y us . Tm tdefault is default.

P F(od c Task Infervals

clea( (-anferval
TheSsr ser2whlitr1mBve)expired r1uourceor15 rd. ai)-.-petcachetna)rg clea( (-anfervalSminutes. Tm tdefault is260Sminutes. If srt os0, nosp F(od cSclea( (2whlitoccur.
heartbea5-anferval
TheSsr ser2whlitv). -.5 zB-.Smainten58ceetasks orw)ae zB-.sSmarked dialup yes ws neser2tmal2infervaltexpires. Tm tdefault is260Sminutes. Reason5ble.value. are2up to212d1y (1440Sminutes). Ifsse .fo.0, noszB-.Smainten58ceeorwStm s/ zB-.l2whlitoccur.
i(ferface-anferval
TheSsr ser2whlitscan thesnetw2.5 3Fferface li 1ina)rg i(ferface-anfervalSminutes. Tm tdefault is260Sminutes. Ifsse .fo.0, 3Fferface scan( (2whlitonloSoccur when thescoy igur5 E F ail tal2loaded. AfFer2tc sscan,tl steners2whlitbe start21 E . ly new iFferfaces (d uvidei th)y are2allnwed by es sl sten-on coy igur5 E F). L steners2E iFferfaces es5 have2gB-.Saway willsbs clea( d up.
statis13cs-anferval
Nes .r serostatis13cs whlitbe logged na)rg statis13cs-anferval minutes. Tm tdefault is260. If srt.fo.0, nosstatis13cs whlitbe logged.

Topology

Allson wh th (s be3 (tequal, when theser ser chooseseaSfes .r ser fo.15 Fy ai)-.a2li 1iofifes .r sers, at d ef56sies sB-. -pat il topolog csilotcloses fo)3tself. TheStopology statem78 takel2an4a5(ie t_m1tch_li 1 leiinferd et. ittin)ats5 E altway. Each)top-lna)itli 1ielem78 2al aswignei a distalc . Non-negi1ed nlem78 . get a distalc baue .E tc/i) posi EE iF tce list, ws re theSclose) theSmatch is to2theSetart af tc/ lis ,.ese2whorte) theSdistalc s1between i1 46 otce2sr ser. iA negi1ed match willsbs swignei theSmax mum4distalc ai)-.-pet.r ser. If tc/is al2no match, es saddie t2willsget a distalc which is2furtc/i than any fon-negi1ed li 1ielem78 , a6 oclose) than any fegi1ed elem78 . Fo) nxample,

    topology {
        10/8;
        !1.2.3/24;
        { 1.2/16; 3/8; };
    };

whlitp ef56isr sers onsnetw2.5 10 theSmos ,.ahe nwed by h at. E netw2.5 1.2.0.0 (netmask 255.255.0.0) ale.netw2.5 3, wher tce2excep E F ofihosts onsnetw2.5 1.2.3 (netmask 255.255.255.0), which is2p ef56red least af all.

Ts sdefault topology is

    topology { n17 lhost; n17 lnets; };

ReuourceoR15 rd s in3 (

Whe9 return3 (.sultiplesRRs, es sfes .r serowillsn-)55 lysreturn es m in Round1Rob39, i. . hfFer2nach)reques , tc/Sairst RR is2put oses/2e6 tBf tc/ lis . Asies sBrder Bf RRs is not defi( (, this sh F2 .not caIse any d ublems.

TheScli78 r1uolvero5ode sh F2 .re-arrange2thesRRs as apd upF(at , i. . an .g2any a5(ie tes2E tc/ n17 ltne .iF p ef56 nc. oson wh a5(ie tes. Hnweser, nsesall r1uolsers can do.esis, o) are2not c rr Etly2co( igured.

Whe9 a4cli78 isEan .g2a n17 ltRr ser, -pet. in3 (2chan5 Fv). -.5edSinStm sr ser, 5aue .E tc/ cli78 's a5(ie t. Tmal2onloSrequires2co( igur .g2thesfes .r sers, nsesall tc/ cli78 s.

TheSs inli 1 statem78 2takel2an4addie t2m1tch2li 1 leiinferd et. ittea)e more4s5 E alng than thestopology statem78 2does.

Each)top lna)itstatem78 2an -pet. inli 1 m2to 3tself.b24an explicit addie t2m1tch2li 1 wher on tar twoonlem78 .. Thesfirst nlem78 (which m6y bs an IP a5(ie t, an IP p efix, an ACLofes ta) nes1ed addie t2m1tch2li 1) Bf each)top lna)itli 1iis25heckei agains 2tc/ uourceoa5(ie t2Bf tc/ 15 FyvantileaSmatch is found.

O8ceetceSuourceoa5(ie t2Bf tc/ 15 Fyvhas be)e5m1tched,2if tc/ top lna)i statem78 tco8 sins anloSo8eielem78 , theSactusitpF(mi Ea)ielem78 2-pat m1tchedetceSuourceoa5(ie t2al2anei.fo.select tc/oa5(ie t2an tc/ reupo(ue fo.mBve) oses/2begin( (24f tc/ reupo(ue. If tc/ statem78 2al2a2li 1 af)twoonlem78 ., thessrcoydielem78 2alttrea5ed like es saddie t m1tch2li 1 in)attopology statem78 . Each)top lna)itelem78 2alt swignei a distalc 46 otce2a5(ie t2an tc/ reupo(ue wher tce2min mum4distalc s mBved) oses/2begin( (24f tc/ reupo(ue.

Inies sahe nwiie nxample,oanyi15 F(r. rnceivei ai)-.anyi4f tc/ a5(ie tes af tc/ host23tself.willsget reupo(ues p ef56r .g2a5(ie tes2E anyi4f tc/ n17 lly2co(nec1ei netw2.5.. Next moto p ef56red are2a5(ie tes2E tc/ 192.168.1/24 netw2.5, andSafFer2tcat ein wh th/ 192.168.2/24 or 192.168.3/24 netw2.5 wher no p ef56 nc. sh wn between these ewo netw2.5.. Q5 F(r. rnceivei ai)-.a host2E tc/ 192.168.1/24 netw2.5 whlitp ef56 on wh a5(ie tes2E tcat netw2.5 oses/2192.168.2/24 a6 .192.168.3/24 netw2.5.. Q5 F(r. rnceivei ai)-.a host2E tc/ 192.168.4/24 or2tc/ 192.168.5/24 netw2.5 whlitanloSv ef56ion wh a5(ie tes2E tc/i) dir Etly2co(nec1ei netw2.5..

. inli 1 {
           { n17 lhost;         // IF   tc/ n17 lthost
             { n17 lnets;       // THENSairst 
it2E  tc/
               192.168.1/24;    //      ahe nwiie nets
               { 192,168.2/24;.192.168.3/24; }; }; };
           { 192.168.1/24;      // IF   on2cla t C 192.168.1
             { 192.168.1/24;    // THENSIse .1, o) .2 o) .3
               { 192.168.2/24;.192.168.3/24; }; }; };
           { 192.168.2/24;      // IF   on2cla t C 192.168.2
             { 192.168.2/24;.   // THENSIse .2, o) .1 o) .3
               { 192.168.1/24;.192.168.3/24; }; }; };
           { 192.168.3/24;      // IF   on2cla t C 192.168.3
             { 192.168.3/24;.   // THENSIse .3, o) .1 o) .2
               { 192.168.1/24;.192.168.2/24; }; }; };
           { { 192.168.4/24;.192.168.5/24; }; // if .4 or2.5,2d ef56itcat net
           };
};
Ts sahe nwiie nxample.willsgEa)ireason5ble.behav our2at) tm tn17 lthost a6 ohosts onsdir Etly2co(nec1ei netw2.5.. I istsimilar) oses/2behav or 4f tc/ a5(ie tt. in2an has. 4.9.x. Reupo(ues s78 .fo2q5 Fies2ai)-.th) n17 lthost2whlitfavrw24lyi4f tc/ dir Etly2co(nec1ei netw2.5.. Reupo(ues s78 .fo2q5 Fies2ai)-.4lyi4n wh hosts onsa dir Etly2co(nec1ei netw2.52will d ef56ia5(ie tes2E tcat ses tnetw2.5. Reupo(ues oson wh q5 Fies2will n-o bet. ined.
. inli 1 {
            { n17 lhost; n17 lnets; };
            { n17 lnets; };
};

RRset Order3 (

Whe9 sultiplesr15 rd. are return (di . l answ/i)3t m6y bs Iseful2to c ( igureies sBrder tc/ re5 rd. are placei 39to2tc sreupo(ue. Fo) nxample the re5 rd. arw)atzB-.Smight b24c ( igured to alwayl2be return (di .es sBrder tc/y are4defi( ( iF)-pe4zB-. ail . OrFv).hapl2asranrem shuffle2ar the re5 rd. as th)y are2return (dis wa8 ed. Tcesrrset-order statem78 permits2coy igur5 E FS4f tc/ order3 ( m6de 4f tc/ re5 rd. insa sultiplesr15 rd reupo(ue. Thesdefault,sif nosorder3 ( is defi( (, al2a2cycl cSorder3 ( (round rob39).

Ansorder_w5 E is defi( ( as ahe nws:

  [scla t cla t_fes  ][stypr typr_fes  ][sfes  "FQDN" ]sorder order3
(

If noscla t ises5 E fied, thesdefault is2<5ode>ANY. Ifsns typr ises5 E fied, thesdefault is2<5ode>ANY. Ifsns fes ises5 E fied, thesdefault is2<5ode>"*".

Ts slegal value. fah <5ode>order3 ( ar :

<5ode>fixed
R15 rd. are return (di .es sBrder tc/y are4defi( ( iF)-pe4zB-. ail .
<5ode>ranrem
R15 rd. are return (di .sos ranrem Brder.
<5ode>cycl c
R15 rd. are return (di .a round-rob39 Brder.

Ft) nxample:

    rrset-order2{
	cla t IN typr Asfes  "rc.vix.com"sBrder ranrem;
        Brder cycl c;
    };

whlitcaIse any reupo(ues at) typr A re5 rd. inscla t IN es5 have2"rc.vix.com"s4l2assuffix, to alwayl2be return (di ranrem Brder. Allson wh r15 rd. are return (di .cycl cSorder.

If sultiples<5ode>rrset-order statem78 . appear, tc/y are4nse combi( (--tc slast2E edapp ies.

If nos<5ode>rrset-order statem78 ises5 E fied, asdefault B-. of: rrset-order2{2cla t ANY typr ANY fes "*" Brder cycl c ; };

is anei.

Tun3 (

lame-ttl
Sets2es sfumberiofssrcoyds oscacheta2lame sr ser2andicatiE . 04dis5bles cach3 (. Default is2600 (10Sminutes). Max mum4value il21800 (30Sminutes).
max-ncache-ttl
Totreiucesnetw2.5 traff cS leiincreas .v). -.5a8ceetceSur serost res.negi1ia) answ/is. max-ncache-ttl2al2anei.fo.seteaSmax mum4ret78 8E tim/ at).th)seoansw/is in tc/ sr ser2al2srcoyds. Tm tdefault max-ncache-ttl2al 10800 srcoyds (3 hrwrs). max-ncache-ttl2cannsesexceedetce max mum4ret78 8E tim/ at) rd3 arg (posi Eve)oansw/is (72d1ys) ale.willsbs sil ntng trun7 tei.fo.72d1yssif srt.fo.a value which is2grea5e6itcat 72d1ys.
min-roots
TheSmin mum4fumberiofsroot sesvers s51 al2r1quirei arw)a reques 2at) tm troot sesvers osbeoaccep ed. Default 2.

[2has. Coy ig. Fil |2has. Hom |2ISC ]


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