[TriLUG] problems with multiple interfaces on a RHEL5.5 x64 machine
Matt Pusateri
mpusateri at wickedtrails.com
Tue Nov 8 19:52:59 EST 2011
You could try setting your gateway for eth1 inside your ifcfg-eth1 instead of inside /etc/sysconfig/network. But I can't see where that would matter.
On Nov 8, 2011, at 7:39 PM, Warren Myers wrote:
> I'm pinging by IP (eg 8.8.8.8).
>
> The gateway has been set in /etc/sysconfig/network to be the same as is
> handed-out by DHCP
>
> Before setting eth1 to be static, it was on dhcp and the two interfaces
> were getting sequential IPs (and with either up and the other down, we
> could ping outside devices).
>
> -WMM
>
> On Tue, Nov 8, 2011 at 19:31, Matt Pusateri <mpusateri at wickedtrails.com>wrote:
>
>> Heath is on track here most likely. What does netstat -rn show when only
>> eth1 is up versus when eth2 is up. Also when you are pinging external IP's
>> are you pinging by IP or by hostname? If it's by hostname, I would suspect
>> that your name servers are getting set in resolv.conf when you get an
>> address via DHCP.
>>
>> Matt P.
>>
>> On Nov 8, 2011, at 7:28 PM, Heath Roberts wrote:
>>
>>> 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
>>>> --
>>>> This message was sent to: Heath Roberts <htroberts at gmail.com>
>>>> To unsubscribe, send a blank message to trilug-leave at trilug.org from
>> that
>>>> address.
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>>>>
>>>
>>>
>>>
>>> --
>>> Heath Roberts
>>> htroberts at gmail.com
>>> --
>>> This message was sent to: M. Pusateri <mpusateri at wickedtrails.com>
>>> To unsubscribe, send a blank message to trilug-leave at trilug.org from
>> that address.
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>>
>> --
>> This message was sent to: Warren <volcimaster at gmail.com>
>> To unsubscribe, send a blank message to trilug-leave at trilug.org from that
>> address.
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>>
>
>
>
> --
> Warren Myers
> http://warrenmyers.com
> http://twitter.com/volcimaster
> http://www.linkedin.com/in/warrenmyers
> --
> This message was sent to: M. Pusateri <mpusateri at wickedtrails.com>
> To unsubscribe, send a blank message to trilug-leave at trilug.org from that address.
> TriLUG mailing list : http://www.trilug.org/mailman/listinfo/trilug
> Unsubscribe or edit options on the web : http://www.trilug.org/mailman/options/trilug/mpusateri%40wickedtrails.com
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