Re: Can't ping into or outof Redhat box

From: Ermanno Sartori (ermanno.sartori_at_gazzettino.it)
Date: 01/06/04


Date: Tue, 06 Jan 2004 23:41:25 +0100

Geoff wrote:
> "Jerry Smiley" <jsmiley@nc.rr.com> wrote in message
> news:D9kKb.236150$I53.10968840@twister.southeast.rr.com...
>
>>Geoff wrote:
>>
>>
>>>"Jerry Smiley" <jsmiley@nc.rr.com> wrote in message
>>>news:VggKb.207427$dl.10549419@twister.southeast.rr.com...
>>>
>>>>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
>>>>
>>>
>>>I have tried different cables, with the same results.
>>>
>>>netstat -r gives the following :
>>>
>>>Destination Gateway Genmask Flags MSS
>>>Window irtt Iface
>>>172.16.37.0 * 255.255.255.0 U 0
>>>0 0 eth0
>>>169.254.0.0 * 255.255.0.0 U
>>
>>0169.254.0.0 * 255.255.0.0 U 0
>>
>>>0 0 eth0
>>>127.0.0.0 * 255.0.0.0 U
>>>0 0 0 lo
>>>default 172.16.37.254 0.0.0.0 UG 0
>>>0 0 eth0
>>>
>>>
>>>The Router IP address (on the LAN side) is 172.16.37.254
>>
>>Looking at your route -r output...it appears you have another IP route of
>>169.254.0.0 that may be causing a problem. It shows a route to IP
>>networks. I am assuming that only the IP network of 172.16.37.0 is the
>>network that you have setup for your pc to the router.
>>
>>
>>Here is my netstat -r....my router is 192.168.1.1
>>
>>Kernel IP routing table
>>Destination Gateway Genmask Flags MSS Window irtt
>>Iface
>>192.168.1.0 * 255.255.255.0 U 0 0 0
>>eth0
>>default 192.168.1.1 0.0.0.0 UG 0 0 0
>>eth0
>>
>
>
> I've run :
> > route del -net 169.254.0.0 netmask 255.255.0.0
> > route del -net default
>
> So all I am left with is :
> Destination Gateway Genmask Flags MSS
> Window irtt Iface
> 172.16.37.0 * 255.255.255.0 U 0
> 0 0 eth0
> 127.0.0.0 * 255.0.0.0 U
> 0 0 0 lo
>
> But I still get the same results for a ping..
>
>
>
>
your eth0 interface is 192.168.1.0 ? you cannot connect anywhere. 0 an
mask (255) are not valid adresses fo eth interfaces.

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