[TriLUG] problems with multiple interfaces on a RHEL5.5 x64 machine

[Heath Roberts]

I don't know specifically about linux, but most unix distributions don't
like having multiple interfaces on the same subnet.

As to why you have 'external' (by which I assume you mean off your own
subnet) connectivity with the DHCP address and not the static one: When you
have the DHCP interface active, it's learning routes (well, at least a
default route) from DHCP. How are you configuring routes when only the
static interface is up?

On Tue, Nov 8, 2011 at 7:20 PM, Warren Myers <volcimaster at gmail.com> wrote:

> Good evening, all
>
> I am trying to use a statically-assigned address on one interface (eth1) of
> a server and have a dhcp-assigned address on another interface (eth2) on
> the same subnet (172.17.11.0/24).
>
> When I setup a static IP for eth1 (following the directions found on
>
> http://www.cyberciti.biz/faq/rhel-centos-fedoracore-linux-network-card-configuration
> ),
> I entered the following into `/etc/sysconfig/network-scripts/ifcfg-eth1`:
>
> # ServerEngines Corp. Emulex OneConnect 10Gb NIC (be3)
> DEVICE=eth1
> BOOTPROTO=static
> DHCPCLASS=
> HWADDR=00:21:5A:9B:00:41
> IPADDR=172.17.11.203
> NETMASK=255.255.255.0
> #TYPE=ethernet
> ONBOOT=yes
>
>
> If eth1 is the only adapter running, I cannot ping *ANY* external IP :(
>
> When eth2 is also running, I can ping external addresses.
>
> `ifconfig` returns the following:
>
> eth1      Link encap:Ethernet  HWaddr 00:21:5A:9B:00:41
>          inet addr:172.17.11.203  Bcast:172.17.11.255  Mask:255.255.255.0
>          inet6 addr: fe80::221:5aff:fe9b:41/64 Scope:Link
>          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
>          RX packets:4747 errors:0 dropped:0 overruns:0 frame:0
>          TX packets:5495 errors:0 dropped:0 overruns:0 carrier:0
>          collisions:0 txqueuelen:1000
>          RX bytes:447100 (436.6 KiB)  TX bytes:1059019 (1.0 MiB)
>          Memory:fbf60000-fbf80000
>
> eth2      Link encap:Ethernet  HWaddr 00:21:5A:9B:00:42
>          inet addr:172.17.11.245  Bcast:172.17.11.255  Mask:255.255.255.0
>          inet6 addr: fe80::221:5aff:fe9b:42/64 Scope:Link
>          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
>          RX packets:6745 errors:0 dropped:0 overruns:0 frame:0
>          TX packets:10802 errors:0 dropped:0 overruns:0 carrier:0
>          collisions:0 txqueuelen:1000
>          RX bytes:1260318 (1.2 MiB)  TX bytes:12302950 (11.7 MiB)
>          Memory:fbe40000-fbe60000
>
>
> # cat /etc/sysconfig/network
> HOSTNAME=<redacted>
> NETWORKING=yes
> NETWORKING_IPV6=no
> GATEWAY=172.17.11.1
>
>
> Am I missing something super obvious? If so, what is it?
>
> Regards,
> Warren
>
> --
> Warren Myers
> http://warrenmyers.com
> http://twitter.com/volcimaster
> http://www.linkedin.com/in/warrenmyers
> --
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-- 
Heath Roberts
htroberts at gmail.com