Root and Forwarders Servers

Bernt bernt at kyivstar.net
Mon May 29 13:53:44 UTC 2000


Hi there, 

 I've just installed new version of BIND (Version = named 8.2.2-P5)
instead of good old 4.9.7 at one of my servers and now doing some testing.
So, I'd be thankfull if anybody could clarify some nuances of
"forwarders" option:

0) I set "forwarders first" and "forwarders server" option and have 
   default root.cache file.

1) When answering a query, named first tries all(?) root servers, 	
   and only after this tries my "forwarders server" 193.193.193.100.
   This significantly slows dns responces.
  
   The problem is that I expect named to query "forwarders server"
   first, not one of the root servers, because my forwarder answers much
   faster than root does.  Nevertheless, I dont want to use 
   "forwarders only " option, cause this will disable use of root servers
   even if my "forwarder" is unavailable.


Some debug 1 output from named.run (with no connection to root servers):

datagram from [client.ip].1266, fd 20, len 31
req: nlookup(www.digex.net) id 1475 type=1 class=1
req: found 'www.digex.net' as 'net' (cname=0)
forw: forw -> [205.188.185.18].53 ds=4 nsid=61164 id=1475 16ms retry 4sec
resend(addr=1 n=0) -> [195.8.99.11].53 ds=4 nsid=61164 id=1475 64ms
resend(addr=2 n=0) -> [198.41.0.21].53 ds=4 nsid=61164 id=1475 93ms
resend(addr=3 n=0) -> [198.41.3.38].53 ds=4 nsid=61164 id=1475 99ms
resend(addr=4 n=0) -> [198.17.208.67].53 ds=4 nsid=61164 id=1475 118ms
resend(addr=5 n=0) -> [192.5.5.241].53 ds=4 nsid=61164 id=1475 118ms
resend(addr=6 n=0) -> [210.176.152.18].53 ds=4 nsid=61164 id=1475 252ms
resend(addr=7 n=0) -> [198.41.0.4].53 ds=4 nsid=61164 id=1475 451ms
resend(addr=8 n=0) -> [216.33.75.82].53 ds=4 nsid=61164 id=1475 971ms
resend(addr=9 n=0) -> [192.112.36.4].53 ds=4 nsid=61164 id=1475 1006ms
resend(addr=10 n=0) -> [192.36.144.253].53 ds=4 nsid=61164 id=1475 1419ms
reforw(addr=11 n=0) -> [193.193.193.100].53 ds=4 nsid=61164 id=1475 -1ms
			^^^^^^^^^^^^^^^^^

resend(addr=12 n=0) -> [192.203.230.10].53 ds=4 nsid=61164 id=1475 2697ms
resend(addr=0 n=1) -> [205.188.185.18].53 ds=4 nsid=61164 id=1475 16ms
resend(addr=1 n=1) -> [195.8.99.11].53 ds=4 nsid=61164 id=1475 64ms
datagram from [193.193.193.100].53, fd 4, len 123
		^^^^^^^^^^^^^^^^
send_msg -> [client.ip].1266 (UDP 20) id=1475


BR, 

Bernt






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