RHEL6 problem with 2 NICs

I have 2 PCs
PC1 (RHEL5): 2 NICs: 172.29.137.111, 172.29.139.111
PC2 (RHEL6): 2 NICs: 172.29.137.109, 172.29.139.109

From PC3: 172.29.139.11, I can ping both NICs of PC1, but I can only ping 172.29.139.109 of PC2. Routing table of PC1 and PC2 is the same.

Is it related to OS or something, please help me. Thanks.
rvc-itAsked:
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rvc-itAuthor Commented:
I followed this guide
http://www.linuxhorizon.ro/iproute2.html
and I could solve it now.
Thank for your answer.
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Kerem ERSOYPresidentCommented:
Hi,

It seems to me that PC2 has a different default gateway value than PC1 so that 172.29.137.109 can not route cannot send the ping reply back.

Cheers,
K.
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Kerem ERSOYPresidentCommented:
IPRoute2 a different subject altogether. You must have had a problem about routing, Default gateways, which interface the DG belongs  but I don't think this could go down to RHEL 5/6 or something like that.
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Kerem ERSOYPresidentCommented:
Normally you would not need to add routing for any interface which is attached to the system.. There is/was a problem with your routing but somehow you've managed to circumvent it. But I don2t think this is about RHEL6.  There must be something that have altered your routing table..
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rvc-itAuthor Commented:
I'm not sure why RHEL5 can route automatically to outside with 2 NICs but RHEL6 doesn't.
I have to add 2 routing tables for VLAN137 and VLAN139 separately to make it works.
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