John Oliver wrote: > I'm looking at a machine (Dell PE 1950 running RHEL4u5) that has no > network connectivity. I've checked the usual suspects... made sure that > the configuration for each interface matches the physical interface and > its crossconnect to the proper switch, hardware addresses, iptables, ARP > entries. It can ping it's own IP address, but cannot get out on the > network at all, from any interface. The Ethernet interfaces are > detected properly and the correct drivers are being loaded. There is no > sign of trouble whatsoever, other than the fact that it does not work > :-) > > This is a lab machine, so no idea is too outlandish... everyone has root > access to most of the lab machines, so I wonder that strange issues like > this do not occur more frequently.
Simplify the experiment! Can you disconnect all network cables and reconnect one ethernet port to a test laptop, say. Use x-over cable if needed. Then check link lights, use ethtool (or mii-tool, mii-diag). Assign manual IPs (eg, via:) ifconfig eth0 192.168.23.45 up Then test ping, and if you suspect hardware, try ttcp or nc (netcat) or some other tool to exercise (just) the device. Aside: I saw a funny situation a few weeks ago where somebody made a loop-back from one switch port to another which caused confusing symptoms. Only during the process of replacing the switch was the loop discovered. Regards, ..jim -- [email protected] http://www.kernel-panic.org/cgi-bin/mailman/listinfo/kplug-list
