rss26@njit.edu wrote:
Hi,
Given a setup where there are multiple NIC's (some of them being virtual
eth1:1, etc and others being real) and if they all have the same default gw
can a preference be made by a network-application such as the browser of
selecting to use a one NIC over another.
The idea here is that I should be able to select the source IP which should be
used by the network-application.
It is not possible to use RAW sockets here as we are dealing with net-apps and
hence we dont have access to their socket calls. Also, ifdown the not needed
NIC's is also not an option as all NIC's need to stay 'up' all the time.
Any info will be greatly appreciated.
thanks,
Ronak
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It might not be the most efficient method, but iptables could handle
this. You would need the CONFIG_IP_NF_NAT_LOCAL turned on in the kernel,
then you use the SNAT option. I don't think you can do user matching in
POSTROUTING, so you would probably have to use the MARK feature in the
OUTPUT chain, then SNAT the marked packets. The netfilter module you
will want to look at for user matching is called "owner", see the
iptables man page for a short description. You may also want to do some
port matching on your rules as well, for which you can also find info in
the iptables docs.
~Bradley
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