Re: queer dns access problem
- From: david brett <dbrett@xxxxxxx>
- Date: Thu, 03 Jan 2008 15:10:54 -0500
It sounds like a network configuration error somewhere.
Try doing the following:
-traceroute to the DNS server's IP address
-see if you can access anything outside your own network via IP (i.e. ping http)
-see what is the default route on the box not working (netstat -nr)
These three steps will help point the direction to look next.
Please accept my apology if, jumping in late I have missed any of these already.
Steve Phillips wrote:
Bill Tangren wrote:Earlier you said you could ssh out of the broken box. Can you ssh to the
same segment or to a remote network? Can you log in to the box twice and
start a packet capture while you attempt a dns lookup? This might show us
if it is related to firewalling or routing.
If by the same segment, you mean within the same 10.1.5.x domain, I can
ssh if I use the IP number to the same segment (there are errors, but it
ultimately succeeds), but I cannot ssh out of the segment, with or without
IP number. Also, I can ssh into the broken box from within the segment.
[see below]
there is no 10.1.5.x segment, there is only a 10.x segment. You have both the working and non working box in the same network. I would be double checking hte network masks at this point as it does sound like you have a network masking problem. It may also help to know what boxes (ip ranges) are working and what ones are not, what exactly are you testing to.
like
on box a i can ssh to (using ip addresses)
10.1.5.1
10.1.6.1
but not 10.100.6.1
but 202.1.4.5 works as well
on box b all of the above work.
you could also try making your subnet masks smaller, your gateway is in 10.1.1.2 ? try reducing your mask to a /21 (255.255.248.0) and see if that allows you to reach the dns servers - at this point tho, you should really be getting a network tech involved or someone who has access to the dns servers and see how they are configured.
Ian
----- "Bill Tangren" <bjt@xxxxxxxxxxxxx> wrote:On Dec 13, 2007 8:02 AM, Bill Tangren <bjt@xxxxxxxxxxxxx> wrote:10.1.1.46/8 are
OK. Is the /8 netmask a cut and paste error too?No, it is correct.
Your trouble could be a routing issue: 10.1.5.58/8 andthereon the same subnet as far as the network layer is concerned soisno reason to go to the default route. Thats why I asked for a
traceroute too -- or mtr if you have it installed and it will
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