resolv.conf

[johny2K]

i have 2 redhat 7.1 servers, basically same configurations - i am wondering how come i can't telnet the other one and each time i check /etc/resolv.conf - it changes for unknown reason. i used "setup" to configure each network (they are both on the same LAN). i verified /etc/xinetd.d/telnet - both are the same...

what must be wrong?

thanks.

 

[sleipnir214]

Are both machines using static IP addresses? One of the things DHCP does is set the name servers -- and resolv.conf is changed to reflect the name server settings reported by the DHCP servers.



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[gui95]

In the file /etc/securetty, do you have
pts/0
pts/1
...
?

If not, edit this file and write them.

regards,

GBy

 

[johny2K]

sleipnir214 - yes, they're both have static IPs as I set it up using the "setup" command and verified each time with "netstat -rn".

gui95 - i did, but for still unknown reason, something is changing the resolv.conf. Looks like it's not holding on to what I saved.

i can ping the default router, too. I can telnet to other server/s from this problematic server, but not vice-versa.

 

[gui95]

check the file:
/etc/sysconfig/network-scripts/ifcfg-ethN
where N=0 if device is eth0

regards,

Gby

 

[johny2K]

Hello - what about it Gby?

here it is:

DEVICE=eth0
ONBOOT=yes
BOOTPROTO=static
IPADDR=192.168.45.15
NETMASK=255.255.255.0
GATEWAY=192.168.45.1

 

[johny2K]

thanks...

i was able to find the culprit - it's the ipchains service that screwing things up.

i tried these:

1.) verified "/var/log/messages" and look for un-necessary or shall we say - unusual processes..

May 5 13:04:04 localhost ipchains: Flushing all current rules and user defined chains: succeeded
May 5 13:04:04 localhost ipchains: Clearing all current rules and user defined chains: succeeded
May 5 13:04:05 localhost ipchains: Applying ipchains firewall rules succeeded

2.) killed the process, by;

# service ipchains stop

***/var/log/messages shows;

May 5 13:18:01 dcs02 ipchains: Flushing all current rules and user defined chains: succeeded
May 5 13:18:01 dcs02 ipchains: Clearing all current rules and user defined chains: succeeded
May 5 13:18:01 dcs02 ipchains: Applying ipchains firewall rules succeeded
May 5 14:46:00 dcs02 ipchains: Flushing all chains: succeeded
May 5 14:46:00 dcs02 ipchains: Removing user defined chains: succeeded
May 5 14:46:00 dcs02 ipchains: Resetting built-in chains to the default ACCEPT policy succeeded

3.) checked right-after and found out - it is working... i was able to telnet the server from other server.

 

[flugh]

[tt]
i was able to find the culprit - it's the ipchains service that screwing things up.

i tried these:

1.) verified "/var/log/messages" and look for un-necessary or shall we say - unusual processes..
...
2.) killed the process, by;
[/tt]

Usually when I'm "helping someone solve a network problem", the first thing I tell them to do is drop their firewall. That will make things better.

Seriously. I mean, what can be so bad on the internet. Everyone is friendly, right?
</sarcasm>
I'd rather suggest you should read the Linux IPCHAINS-HOWTO, and maybe this or that. Don't just throw down your defenses because you want to use *gag* telnet. *sigh* I need a beer. Been a long day ;-)

Check out those links, will try to help out later if you want it.

----
JBR

 

[johny2K]

thanks...