Issue with Multihomed Linux System and -e Option

["Jason Alexander" <alexander.jason.a () gmail com>]

Hello,

I have a linux box with two network interfaces,  eth0 and eth1.  I
have the box configured with the following settings:

1: lo: <LOOPBACK,UP,10000> mtu 16436 qdisc noqueue
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
    inet 127.0.0.1/8 brd 127.255.255.255 scope host lo
2: eth0: <BROADCAST,MULTICAST,UP,10000> mtu 1500 qdisc pfifo_fast qlen 1000
    link/ether 00:14:22:49:5b:b3 brd ff:ff:ff:ff:ff:ff
    inet 129.255.13.81/23 brd 129.255.13.255 scope global eth0
3: eth1: <BROADCAST,MULTICAST,UP,10000> mtu 1500 qdisc pfifo_fast qlen 1000
    link/ether 00:e0:98:29:4d:f6 brd ff:ff:ff:ff:ff:ff
    inet 129.255.99.148/27 brd 129.255.99.163 scope global eth1

129.255.99.128/27 dev eth1  proto kernel  scope link  src 129.255.99.148
129.255.12.0/23 dev eth0  proto kernel  scope link  src 129.255.13.81
127.0.0.0/8 dev lo  scope link
default
        nexthop via 129.255.99.129  dev eth1 weight 1
        nexthop via 129.255.12.1  dev eth0 weight 10

When I test with ping and source from eth0 or eth1 it gets sourced
from the correct and travels over the correct interface.

When I do the following command :
nmap -e eth0 -T5 -sS -sV -p- -v 129.255.XX.XX

Everything works ok.  Nmap scanns from the interface and address
assigned to eth0.

When I do the following:
nmap -e eth1 -T5 -sS -sV -p- -v 129.255.XX.XX

Packets are source from the address for eth1 but are being routed out
the interface for eth0.

Any ideas.

Thanks
Jason

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