[Q}Linux TCP/IP stack routing...

Hi,

When figuring out the next hop, does it consider source as well as destination?

I thought that Routing only looks at destination.
But, Linux routing info entry(in TCP/IP stack) consists of source+destination+TOS.

Any comment?

|When figuring out the next hop, does it consider source as well as destination?
|
|I thought that Routing only looks at destination.
|But, Linux routing info entry(in TCP/IP stack) consists of source+destination+TOS.
|
|Any comment?

Consider a multihomed host... (you fill in the rest).

Yes, Linux looks the route to the source address to find out whether there
is IP Spoofing.

Ida Young
Support of ITShield firewall
www.itshield.com


"Paul" <hotmxptmxm@hotmail.com> wrote in message
news:7bfd3ebd.0306232008.1ece26b5@posting.google.c om...
> Hi,
>
> When figuring out the next hop, does it consider source as well as
destination?
>
> I thought that Routing only looks at destination.
> But, Linux routing info entry(in TCP/IP stack) consists of
source+destination+TOS.
>
> Any comment?

hcckfn@cmvykd.com.zj wrote in message news:<NzQJa.647$g_1.4478@news-server.bigpond.net.au>...
> |When figuring out the next hop, does it consider source as well as destination?
> |
> |I thought that Routing only looks at destination.
> |But, Linux routing info entry(in TCP/IP stack) consists of source+destination+TOS.
> |
> |Any comment?
>
> Consider a multihomed host... (you fill in the rest).

Still, routing is just to find a nexthop and send over to it. Why source matters?