A PC with two NIC routing problem

A linux PC has two NIC cards:
eth0=10.10.10.100/24 belongs to VLAN 10
eth1=11.11.11.100/24 belongs to VLAN 11
the default gateway is 10.10.10.1

A layer 3 switch has the following configuration:
int vlan 10
  ip addr 10.10.10.1 255.255.255.0
int vlan 11
  ip addr 11.11.11.1 255.255.255.0

Host10 on vlan 10 with ip address 10.10.10.10/24 can ping 10.10.10.100,
but cannot ping 11.11.11.100

Host11 on vlan 11 with ip address 11.11.11.11/24 can ping 11.11.11.100,
but cannot ping 10.10.10.100

How to make the linux PC respond to all pings from both hosts?

Thanks,
Jack

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Received on Fri Oct 01 2010 - 13:32:08 ART