Very Computer

by **Peter Gehrin** » Sat, 17 Feb 2001 07:59:08

im working with a small Linux System with network support on an local
network. A ping from a remote machine is successful. A local telnet
session is also successful. A telnet session from the remote machine
will fail.

I can see with ifconfig, if the ping from the remote machine is running,

the tx counter increases. If I try the remote telnet session, i can
watch incoming packets but no packet will transmitted.

With tcpdump i see the telnet connect request from the remote machine.
At next my machines sends an arp-request about the address of the remote

machine and the remote machine replies the correct information, but
nothing will happen.

My routing table has an entry for the network an for my own machine.
Im Starting telnetd by inetd.conf direct not checked by tcpd.

Has anybody an idea whats going wrong.

Thanks

Peter

by **David Efflan** » Sat, 17 Feb 2001 16:57:17

>im working with a small Linux System with network support on an local
>network. A ping from a remote machine is successful. A local telnet
>session is also successful. A telnet session from the remote machine
>will fail.

>I can see with ifconfig, if the ping from the remote machine is running,

>the tx counter increases. If I try the remote telnet session, i can
>watch incoming packets but no packet will transmitted.

>With tcpdump i see the telnet connect request from the remote machine.
>At next my machines sends an arp-request about the address of the remote

>machine and the remote machine replies the correct information, but
>nothing will happen.

>My routing table has an entry for the network an for my own machine.
>Im Starting telnetd by inetd.conf direct not checked by tcpd.

>Has anybody an idea whats going wrong.

Is the name of the remote box in /etc/hosts if not DNS? It could be that
you are not waiting the minute or two it takes for reverse dnslookup
failure to time out. That should not happen if the name of the remote box
is known to the server, unless you have something blocked with host.allow,
hosts.deny, ipchains, etc.

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Very Computer

Remote Ping successful/telnet local successful/telnet remote failed

Remote Ping successful/telnet local successful/telnet remote failed

Remote Ping successful/telnet local successful/telnet remote failed