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Bluey_the_dog
n00b
Joined: 13 Oct 2002
Posts: 69
Location: Perth, Australia
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 Posted: Wed Aug 30, 2006 4:04 am Post subject: [SOLVED] Possible DNS screwup - but then possibly not???? |
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Hi all,
Where I work I'm looking after a small group of Linux & windows machines within a larger windows based network. My problem is that one gentoo machine can ping everything except another gentoo machine. In more detail:
Windows machine: win1
Gentoo machine: gen1
Another gentoo machine: gen2
Third party machine outside our firewall, such as google.com, the isp etc: outside1
Lets ping some machines...
win1 can ping: win1, gen1, gen2, outside1
gen1 can ping: win1, gen1, gen2, outside1
gen2 can ping: win1, NOT gen1, gen2, outside1, any other machine on our network, any machine outside our firewall
As you can see everything can ping everything else except for one specific machine that can't ping one specific other machine. Does anyone have and ideas as to why this rather strange thing is happening?
Regards,
Andrew
Last edited by Bluey_the_dog on Thu Aug 31, 2006 11:53 pm; edited 1 time in total |
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PsychoticRetina
Guru
Joined: 18 Dec 2005
Posts: 352
Location: behind the scalpel
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| Posted: Wed Aug 30, 2006 4:56 am Post subject: Re: Possible DNS screwup - but then possibly not???? |
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when pinging machines on the network, are you pinging by hosname or ip? sounds as if either theres no entry for gen1 in gen2s /etc/hosts (if by hostname) or gen1 is set to drop icmp packets from gen2s ip.
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Bluey_the_dog
n00b
Joined: 13 Oct 2002
Posts: 69
Location: Perth, Australia
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| Posted: Wed Aug 30, 2006 5:34 am Post subject: Re: Possible DNS screwup - but then possibly not???? |
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| vesselin wrote: | | when pinging machines on the network, are you pinging by hosname or ip? sounds as if either theres no entry for gen1 in gen2s /etc/hosts (if by hostname) or gen1 is set to drop icmp packets from gen2s ip. |
Forgot to mention in the original post that everyone can ping everyone else successfully via IP addresss but the problem only occurs when using host names. Host files aren't used as such, everything is via DHCP/DNS. Also none of the machines have firewalls as we, win1, gen1, gen2, are all behind the mighty corporate firewall 
Andrew |
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Diezel
l33t
Joined: 04 Feb 2003
Posts: 600
Location: Karjaa, Finland
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| Posted: Wed Aug 30, 2006 6:49 am Post subject: |
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Does gen2 solve the IP of gen1 when you are trying to ping it? What does nslookup say? Can gen2 ping gen1 if you supply the full hostname, as in gen1.corporatenetwork.com?
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Bluey_the_dog
n00b
Joined: 13 Oct 2002
Posts: 69
Location: Perth, Australia
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| Posted: Thu Aug 31, 2006 11:56 pm Post subject: |
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Thanks for the tips. Had a bit of a fiddle with nslookup and discovered that the dns server had had a bit of a brain fade. Got the admin to give it a bit of a nudge and things are now working. I can now ping anyone from anywhere 
Regards,
Andrew |
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