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Segregating traffic on dual-NIC machine

Segregating traffic on dual-NIC machine

2002-05-07       - By Chris Caputo

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Reply:     1     2     3     4     5     6     7  

Is there something magical I need to know about segregating traffic on a
dual-NIC machine?

Both NICs are plugged into the same Ethernet switch with configs as
follows. What I am seeing is that most of the packets destined to
10.1.1.12 are going to eth1 and only some are going to eth0, even though I
would expect them all to go to eth0.

It is almost like eth1 is ARPing for both IP addresses on the machine.

Thanks for any insight,
Chris

---

ifconfig output:

eth0 Link encap:Ethernet HWaddr 00:00:00:00:E3:88
inet addr:10.1.1.12 Bcast:10.1.1.255 Mask:255.255.255.0
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:20262 errors:0 dropped:0 overruns:0 frame:0
TX packets:385 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:100
RX bytes:2369763 (2.2 Mb) TX bytes:38708 (37.8 Kb)
Interrupt:18 Base address:0xf000

eth1 Link encap:Ethernet HWaddr 00:00:00:00:E3:89
inet addr:10.1.1.14 Bcast:10.1.1.255 Mask:255.255.255.0
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:39609 errors:0 dropped:0 overruns:0 frame:0
TX packets:85114 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:100
RX bytes:29001121 (27.6 Mb) TX bytes:107388915 (102.4 Mb)
Interrupt:19 Base address:0x1000

/etc/sysconfig/network-scripts/ifcfg-eth0 contains:

BOOTPROTO= 'none '
BROADCAST= '10.1.1.255 '
DEVICE= 'eth0 '
GATEWAY=10.1.1.254
HWADDR=00:00:00:00:E3:88
IPADDR= '10.1.1.12 '
NETMASK= '255.255.255.0 '
NETWORK= '10.1.1.0 '
ONBOOT= 'yes '
TYPE=Ethernet
USERCTL=no

and /etc/sysconfig/network-scripts/ifcfg-eth1 contains:

BOOTPROTO=none
BROADCAST=10.1.1.255
DEVICE=eth1
GATEWAY=10.1.1.254
HWADDR=00:00:00:00:e3:89
IPADDR=10.1.1.14
NETMASK=255.255.255.0
NETWORK=10.1.1.0
ONBOOT= 'yes '
TYPE=Ethernet
USERCTL=no