Only ping to the ip outside outside our internal network under Redhat7.1

Only ping to the ip outside outside our internal network under Redhat7.1

Post by Simon Le » Tue, 26 Mar 2002 23:20:51



Dear all,

 Redhat 6.0 is originally acts as our linux server.  Recently, we install
Red Hat 7.1 as our school server. The config is the same as that of the old
server. We can ping the ip outside our internal network. However, it is very
strange that the other services cannot work, e.g. it cannot connect to the
internet through Netscape, Mail server also cannot  work even for the
computers (using the outlook in Win98) in our internal network. But it can
send mail to the other clients by entering "mail somebody" at the server
computer.   Why? Note that DNS service does work because it can update the
data from the old server but  NFS service do not work. Please give some
advice, thanks.

Sincerely yours,
Simon

 
 
 

Only ping to the ip outside outside our internal network under Redhat7.1

Post by peter pils » Wed, 27 Mar 2002 06:44:18



> Dear all,

>  Redhat 6.0 is originally acts as our linux server.  Recently, we install
> Red Hat 7.1 as our school server. The config is the same as that of the
> old server. We can ping the ip outside our internal network. However, it
> is very strange that the other services cannot work, e.g. it cannot
> connect to the
> internet through Netscape, Mail server also cannot  work even for the
> computers (using the outlook in Win98) in our internal network. But it can
> send mail to the other clients by entering "mail somebody" at the server
> computer.   Why? Note that DNS service does work because it can update the
> data from the old server but  NFS service do not work. Please give some
> advice, thanks.

you have a firewall that let through icmp but not tcp ?

peter

--
peter pilsl

http://www.goldfisch.at

 
 
 

1. Can't see the outside network, but outside can see in - problem.

I have a Linux system setup mainly for ipmasqing to my internal network, and
it also uses fetchmail to rove around and pick up mail.  It had been running
fine for about 3 weeks - and then it stopped being able to make outbound
connections.

What works:
    incoming ftp, telnet, http, nfs, samba - basically everything.  It has
no monitor or keyboard but I can telnet in no problem.
The routing of the internal network to the Internet works extremely well.

What doesn't work.
    When I'm logged on to the machine, I can not telnet out, ftp out, or
anything out, thus it is not picking up my mail or sending mail - basically
any outbound connection does not work.
I can't even 'telnet localhost' or connect in anyway to localhost.

I'm after suggestions as how to fix this.  I've read all my logs and they
are no different than when the system worked great.

Oh yeah - it works for a period of ten minutes up to 3 hours after I reboot.
So to make sure my mail service does not get disrupted I've been having to
reboot every 1 - 3 hours when I'm around.

Any suggestions or insights would be appreciated.
System: Debian 2.0 (hamm/frozen)
Kernel: 2.0.33
486SX-25 / 8mb RAM
2 D-Link DE-220T Network cards (one to cable modem).
ProFTPd and Apache always running - everything else run out of inetd.

Thanks
Jason

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