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henriknj

Member

Registered: 2006-05-11

Posts: 4

DNS delay

Hello! 
I have a problem which I would like some help debugging. I run two boxes acting as DNS cache (using djbdns), Server 1 also acts as my internet gateway
         
When I resolv a hostname with server 1

Server 1:               

$ time ping -c1 sourceforge.net
PING sourceforge.net (66.35.250.203) 56(84) bytes of data.
64 bytes from sourceforge.net (66.35.250.203): icmp_seq=1 ttl=51     time=187 ms

real    0m6.750s

and server 2

Server 2:

$ time ping -c1 sourceforge.net
PING sourceforge.net (66.35.250.203) 56(84) bytes of data.
64 bytes from sourceforge.net (66.35.250.203): icmp_seq=1 ttl=51 time=190 ms

real    0m0.539s

The delay whick server 1 causes is annoying big time, what could the cause for this be?

cactus

Taco Eater

From: t͈̫̹ͨa͖͕͎̱͈ͨ͆ć̥̖̝o̫̫̼s͈̭̱̞͍̃!̰

Registered: 2004-05-25

Posts: 4,622

Website

Re: DNS delay

maybe because you are not using -n with your ping requests, so for each packet, it is doing a dns lookup.
You are likely not pointing the server's dns query to itself either. On the server1, what is in your /etc/resolv.conf?

---

"Be conservative in what you send; be liberal in what you accept." -- Postel's Law
"tacos" -- Cactus' Law
"t̥͍͎̪̪͗a̴̻̩͈͚ͨc̠o̩̙͈ͫͅs͙͎̙͊ ͔͇̫̜t͎̳̀a̜̞̗ͩc̗͍͚o̲̯̿s̖̣̤̙͌ ̖̜̈ț̰̫͓ạ̪͖̳c̲͎͕̰̯̃̈o͉ͅs̪ͪ ̜̻̖̜͕" -- -̖͚̫̙̓-̺̠͇ͤ̃ ̜̪̜ͯZ͔̗̭̞ͪA̝͈̙͖̩L͉̠̺͓G̙̞̦͖O̳̗͍