eth0 has two addresses within the same network. Link scope route has a
src= specifying the first IP address. However, when doing a connect to
one of the IP addresses on eth0 from the machine itself (unbound socket)
the source address ends up identical to the destination address, not to
the src= in the route.
Is this a feature or a bug?
Example:
ip addr:
1: eth0: <BROADCAST,MULTICAST,UP,10000> mtu 1500 qdisc pfifo_fast qlen
1000
link/ether 00:13:72:12:39:3f brd ff:ff:ff:ff:ff:ff
inet 172.17.1.48/16 brd 172.17.255.255 scope global eth0
inet 172.17.2.93/16 scope global secondary eth0
ip route:
172.17.0.0/16 dev eth0 proto kernel scope link src 172.17.1.48
default via 172.17.1.118 dev eth0 proto zebra metric 2
When doing a
nc <anyhost> discard
then <anyhost> sees a connect originating from 172.17.1.48. This is
correct. However, when connecting to the second IP address as in
nc 172.17.2.93 discard
a TCP connection is created originating from 172.17.2.93 instead of
from 172.17.1.48
--
Frank
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