Rodd Clarkson wrote:
On Thu, 2007-10-25 at 17:10 +0800, John Summerfield wrote:
Rodd Clarkson wrote:
A pause at send time suggests a DNS lookup's timing out. Could be your
end, could be the server's.
What's in your /etc/resolve.conf ?
# generated by NetworkManager, do not edit!
nameserver 192.168.1.254
Do your IP addresses reverse-resolve?
not sure what this output means, but:
[rodd@localhost ~]$ host 192.168.1.254
254.1.168.192.in-addr.arpa domain name pointer home.gateway.
[rodd@localhost ~]$ host home.gateway
home.gateway has address 192.168.1.254
;; Warning: short (< header size) message received
;; connection timed out; no servers could be reached
;; Warning: short (< header size) message received
;; connection timed out; no servers could be reached
"time home.gateway"
Should be quick, like this, whether it works or fails.
17:37 [summer@numbat ~]$ time host cdm
cdm.demo.lan has address 192.168.4.254
real 0m0.012s
user 0m0.004s
sys 0m0.005s
17:37 [summer@numbat ~]$ time host 192.168.4.254
Host 254.4.168.192.in-addr.arpa not found: 3(NXDOMAIN)
real 0m0.298s
user 0m0.002s
sys 0m0.009s
17:37 [summer@numbat ~]$
Those timeouts look to me to be your problem. You can try running
tcpdump on the server. Read the docs, but it's something like this:
tcpdump -i any -ttt port 53 and host 192.168.1.100
This shows how to combine criteria; you might want to leave the host off
to see where the requests that time out are going.
[rodd@localhost ~]$
/etc/resolv.conf (END)
Do you control the mail server?
Yes?
Can your mail server resolve the IP addresses of your clients?
Nope.
That's probably part of the problem. Can you fix that?
R.
--
Cheers
John
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