Is it acceptable:2 network cards on 1 server, same subnet?
Say, I've a linux server with 2 network ports. (CentOs)
Ive also 2 identical servers. The one a backup server.
Idea is to manage the backup server via the 2nd ethernet port and if its needed to simply plug the network cable in the live server into 1st ethernet port.
Is it a good idea / acceptable to have the following config for each server?
eth0:192.168.1.51/24
eth1:192.168.1.52/24
Tx
Ive also 2 identical servers. The one a backup server.
Idea is to manage the backup server via the 2nd ethernet port and if its needed to simply plug the network cable in the live server into 1st ethernet port.
Is it a good idea / acceptable to have the following config for each server?
eth0:192.168.1.51/24
eth1:192.168.1.52/24
Tx
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Btw, if I make ether1: 192.168.0.52 I can ping it...?
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Tx. I just used a 2nd subnet. Can you explain though how the 2 routing tables will interact?
You are defining routing-rules, where you can specify how they should interact. In the example above the rule is: If there is traffic from or to local IP 192.168.1.52, use routingtable rt2. With this you can also add a second "default gateway" and do other fancy routing-stuff. For more details on advanced routing with linux and iproute2 see http://lartc.org/howto/
ASKER
Seems some issue with the ethernet setup on the server..
eth0 responds to a ping on .51 and .52
yet this is the setup:
[root@OPSIPBXB ~]# ifconfig
eth0 Link encap:Ethernet HWaddr 2C:41:38:88:31:02
inet addr:192.168.1.51 Bcast:192.168.1.255 Mask:255.255.255.0
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:70867 errors:0 dropped:0 overruns:0 frame:0
TX packets:28588 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:38163290 (36.3 MiB) TX bytes:6199235 (5.9 MiB)
Interrupt:169 Memory:df900000-df910000
eth1 Link encap:Ethernet HWaddr 2C:41:38:88:31:03
inet addr:192.168.1.52 Bcast:192.168.1.255 Mask:255.255.255.0
UP BROADCAST MULTICAST MTU:1500 Metric:1
RX packets:909 errors:0 dropped:0 overruns:0 frame:0
TX packets:3 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:59958 (58.5 KiB) TX bytes:192 (192.0 b)
Interrupt:177 Memory:dfa00000-dfa10000
lo Link encap:Local Loopback
inet addr:127.0.0.1 Mask:255.0.0.0
UP LOOPBACK RUNNING MTU:16436 Metric:1
RX packets:12813 errors:0 dropped:0 overruns:0 frame:0
TX packets:12813 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:2424142 (2.3 MiB) TX bytes:2424142 (2.3 MiB)
and
[root@OPSIPBXB ~]# route
Kernel IP routing table
Destination Gateway Genmask Flags Metric Ref Use Iface
192.168.1.0 * 255.255.255.0 U 0 0 0 eth0
192.168.1.0 * 255.255.255.0 U 0 0 0 eth1
169.254.0.0 * 255.255.0.0 U 0 0 0 eth1
default 192.168.1.210 0.0.0.0 UG 0 0 0 eth0
and eth1 doesn't respond at all.
[root@OPSIPBXB ~]# uname -a
Linux OPSIPBXB 2.6.18-238.12.1.el5 #1 SMP Tue May 31 13:22:04 EDT 2011 x86_64 x86_64 x86_64 GNU/Linux
[root@OPSIPBXB ~]#
Server is HPDL120
Any ideas please?