Re: Can't ping into or outof Redhat box

From: Jerry Smiley (jsmiley_at_nc.rr.com)
Date: 01/05/04 

Date: Mon, 05 Jan 2004 16:28:37 GMT

Geoff wrote:

> The ethernet interface does seem to come up (no errors on boot etc), there
> are lights on on the ethernet card and the link/activity light on the
> router is flashing
>
> Output of ifconfig -a eth0 has the following :
>
> Link encap:Ethernet HWaddr: 00:50:DA:01:CE:36
> inet addr:172.16.37.20 Bcast:172.16.37.255 Mask:255.255.255.0
> UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
> RX packets:0 errors:0 dropped:0 overruns:0 frame:0
> TX packets:16 errors:0 dropped:0 overruns:0 frame:0
> collisions:0 txqueuelen:100
> Rx bytes:0 (0.0 b) TX bytes:822 (822.0 b)
> Interrupt: 5 Basse address:0x220
>
> Output of "ping 172.16.37.15" (PC connected to router)
>
> PING 172.16.37.15 (172.16.37.15) 56(84) bytes of data
> From 172.16.37.20 icmp_seq=1 Destination Host Unreachable
> From 172.16.37.20 icmp_seq=2 Destination Host Unreachable
> From 172.16.37.20 icmp_seq=3 Destination Host Unreachable
> From 172.16.37.20 icmp_seq=4 Destination Host Unreachable
> From 172.16.37.20 icmp_seq=5 Destination Host Unreachable
> From 172.16.37.20 icmp_seq=6 Destination Host Unreachable
> From 172.16.37.20 icmp_seq=7 Destination Host Unreachable
> From 172.16.37.20 icmp_seq=8 Destination Host Unreachable
> From 172.16.37.20 icmp_seq=9 Destination Host Unreachable
> CNTRL-C
> ---- 172.16.37.15 ping statistics ---
> 12 packets transmitted , 0 received, +9 errorrs, 100% packet loss, time
> 11077ms, pipe 3
>
> if I do another ifconfig -a eth0 (after the ping)
> the tx packet count goes up but that's it.
>
> If I change the router to a hub I get the same results.
>
>
> Geoff.
>
>
>
>
>
> "P.T. Breuer" <ptb@oboe.it.uc3m.es> wrote in message
> news:vndvsb.qgv.ln@news.it.uc3m.es...
>> In comp.os.linux.networking Geoff <geoff_r@canada.com> wrote:
>> > I can ping my system from itself (ie local host, or via it's static
> IP),
>> By IP address? You'd expect to. The pings never leave the kernel.
>> > however I can't ping it from the outside world... (http is the same, ok
> from
>> Then your network card is not working.
>> > on the box, but not from outside).
>> > What may not be set-up correct ?
>> Most anything at all, given lack of data like output from /sbin/ifconfig,
>> notice of HOW you are doing the ping, what the packet counts on the
>> interface look like, what the tcpdump from the interface shows ...
>>
>> Peter
Have you swapped out your cable....seeing that the packets are being
transmitted, it may be that the cable is bad or may not be the correct
patch cable.

Also, run netstat -r and you should the router gateway....please post the
results from the netstat -r Thanks

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