Duplicate Packets...

[Cyril Lalloum]

On Mon, 14 Jan 2002, Patrick Schaaf wrote:

>
> Hi Cyril,
>
> >=A0I explain :)
> >
> >=A0I have a VIP and 5 real servers behind, for example ; I want each pac=
ket
> >=A0which arrived on the VIP to be redirected on every real server.
>
> Weird setup. Really weird... What do you expect those packets to be
> in terms of protocol (udp, tcp, whatever?) and/or port? Will the servers
> somehow answer to the packets, or just capture them?
>

Yes, I imagine that is a weird thing...
But in my case it should work whithout any conflict... i hope

The real servers will just capture the streams and will act in
consequence, no particular action to do on packets ; it's a one-way stream
:)

protocol should be tcp most of time but could be udp too.



> >=A0So i would like the 5 real servers to receive exactly the same packet=
s.
>
> Hmm. Maybe using the subnet broadcast address would just work? That would
> maybe require undoing whatever your boot scripts did to the stuff under
> /proc/sys/net/ipv4/. It works for ping, it should work for UDP also.
>

I guess that the subnet braodcast address won't be enough because server
have to be bind to the IP, and in an other hand with tcp i don't know what
could be the session...



> On your direct approach: no, I know of no iptables target which duplicate=
s
> or somehow multiplicates an incoming packet. And that's a good thing,
> in general...


thinks,




--=20
Cyril Lalloum