Hi Folks!
Thanks to all those who have so far offered help.
> Check the tcpdump. If it shows the packets going out on the interface,
> then you have a cable problem. Otherwise, you have a routing problem.
Okay, I'm a networking newbie, so I'm sending some tcpdump info. I have
read the NET3-HOWTO, and everything looks set up as it suggests. In
fact, I've used the Redhat netcfg utility and checked that against NET3.
I don't have routed running as there's only the two machines. I just
don't understand why this is happening (as everything I know to check
looks just fine).
Maybe you guys can give me some verbose pointers? tcpdump on both
machines gives the same output (phew!), so it would seem that the
cabling is okay, so it's down to a routing problem. What to do, then?
Background - both are running kernel 2.2.5, office1 is a dual PII SMP
machine with Intel Pro/100+ TX card (using eepro100 driver), whereas
office2 is a single proc machine with Realtek PCI-NE2000 card (using
ne2k-pci). Office1 is running samba, which explains the netbios
datagrams.
First, to get the IP and HWaddr info:
[root@office1 linux]# ifconfig eth0
eth0 Link encap:Ethernet HWaddr 00:10:5C:AB:01:D8
inet addr:192.168.1.1 Bcast:192.168.1.255 Mask:255.255.255.0
UP BROADCAST RUNNING PROMISC MULTICAST MTU:1500 Metric:1
RX packets:218 errors:0 dropped:0 overruns:0 frame:0
TX packets:819 errors:0 dropped:0 overruns:0 carrier:0
collisions:2 txqueuelen:100
Interrupt:11 Base address:0xe800 Memory:40-0
[root@office2 /root]# ifconfig eth0
eth0 Link encap:Ethernet HWaddr 00:00:E8:D7:4C:21
inet addr:192.168.1.2 Bcast:192.168.1.255 Mask:255.255.255.0
UP BROADCAST RUNNING PROMISC MULTICAST MTU:1500 Metric:1
RX packets:311 errors:0 dropped:0 overruns:0 frame:0
TX packets:2581 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:100
Interrupt:10 Base address:0x6400
[root@office1 linux]# ping office2
PING office2 (192.168.1.2): 56 data bytes
There was 100% packet loss
Here's the tcpdump:
17:01:05.300986 office1 > office2: icmp: echo request
17:01:06.301268 office1 > office2: icmp: echo request
17:01:07.321620 office1 > office2: icmp: echo request
17:01:08.321269 office1 > office2: icmp: echo request
17:01:09.321273 office1 > office2: icmp: echo request
17:01:10.291220 arp who-has office2 tell office1
17:01:10.291528 arp reply office2 is-at 0:0:e8:d7:4c:21
17:01:10.321239 office1 > office2: icmp: echo request
17:01:11.291215 arp who-has office2 tell office1
17:01:11.291517 arp reply office2 is-at 0:0:e8:d7:4c:21
17:01:11.321255 office1 > office2: icmp: echo request
17:01:12.291216 arp who-has office2 tell office1
17:01:12.291526 arp reply office2 is-at 0:0:e8:d7:4c:21
Okay... so, I'll try it from the other end:
[root@office2 /root]# ping office1
PING office1 (192.168.1.1): 56 data bytes
100% packet loss as usual....
17:17:55.120115 office2 > office1: icmp: echo request
17:17:56.119833 office2 > office1: icmp: echo request
17:17:57.119670 office2 > office1: icmp: echo request
17:17:58.119618 office2 > office1: icmp: echo request
17:17:59.119332 office2 > office1: icmp: echo request
17:18:00.119177 office2 > office1: icmp: echo request
17:18:09.291364 office1.netbios-dgm > 192.168.1.0.netbios-dgm: udp 213
17:18:09.291456 office1.netbios-dgm > office2.netbios-dgm: udp 181
17:18:14.291217 arp who-has office2 tell office1
17:18:14.291522 arp reply office2 is-at 0:0:e8:d7:4c:21
17:18:15.291226 arp who-has office2 tell office1
17:18:15.291531 arp reply office2 is-at 0:0:e8:d7:4c:21
17:18:16.291215 arp who-has office2 tell office1
17:18:16.291527 arp reply office2 is-at 0:0:e8:d7:4c:21
Neither machine sends replies to the other. They just send requests.
Both machines get exactly the same output from tcpdump. Please let me
know what I should do to get them talking.
Thanks,
Jason
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