alpha-lemming
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Intermittent network connection
I have the following network setup:
4 Hosts (Debian, Ubuntu, 2x Freebsd) on a Gbit-Ethernet switch uplinked to ->
a 24-port Fast-Ethernet with a variety of heterogenous hosts in a local lan.
All of the hosts are in the same class C network and use the same gateway and dns server.
I recently added an Esxi server with 2 gbit-Ethernet cards to the network, with one card configured as a dedicated management interface, connected to the Fast-Ethernet switch with an IP in the local network. The other card, used by the VM-nets, is connected to the Gbit Ethernet switch. (I have also tried it the other way around)
The problem: the management network is intermittently unreachable from all but ONE machine, a FreeBSD machine on the same switch. Really weird. I can log into to any other host on the same switch and sometimes have a good connection, sometimes a "no route to host" when I try to ping the management interface. But the connection from the one FreeBSD box on the same switch is rock stable.
I have, of course, tried replacing cables and every possible switch <-> host combination.
Any ideas on what is going on or how to troubleshoot this?
Thanks!
4 Hosts (Debian, Ubuntu, 2x Freebsd) on a Gbit-Ethernet switch uplinked to ->
a 24-port Fast-Ethernet with a variety of heterogenous hosts in a local lan.
All of the hosts are in the same class C network and use the same gateway and dns server.
I recently added an Esxi server with 2 gbit-Ethernet cards to the network, with one card configured as a dedicated management interface, connected to the Fast-Ethernet switch with an IP in the local network. The other card, used by the VM-nets, is connected to the Gbit Ethernet switch. (I have also tried it the other way around)
The problem: the management network is intermittently unreachable from all but ONE machine, a FreeBSD machine on the same switch. Really weird. I can log into to any other host on the same switch and sometimes have a good connection, sometimes a "no route to host" when I try to ping the management interface. But the connection from the one FreeBSD box on the same switch is rock stable.
I have, of course, tried replacing cables and every possible switch <-> host combination.
Any ideas on what is going on or how to troubleshoot this?
Thanks!
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Any updates?
ASKER
Sorry for the delay, had to go out of town..
No, the hosts that cannot connect do not have or get a mac address for the management nic
arp <host> spits out the ip addres, then "no entry" for the mac...
The management interface is not in a VLAN and failover/loadbalancing with the other nic ist turned off.
It's just weird that this one BSD box has a rock solid connection while all the others are flaky..
No, the hosts that cannot connect do not have or get a mac address for the management nic
arp <host> spits out the ip addres, then "no entry" for the mac...
The management interface is not in a VLAN and failover/loadbalancing with the other nic ist turned off.
It's just weird that this one BSD box has a rock solid connection while all the others are flaky..
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ASKER
All the nics are in Autonegotiate mode.
I found the culprit, although I don't know the exact cause yet.
Shutting down one of the other hosts, which is running vmware-server makes everything work right. Maybe I had duplicate macs or something...
I found the culprit, although I don't know the exact cause yet.
Shutting down one of the other hosts, which is running vmware-server makes everything work right. Maybe I had duplicate macs or something...