Hi Jamin,
Actually, after trying it out, you are correct. There isn't a port conflict when using the IP aliasing. I don't know why I didn't try
it out to begin with, but I just assumed there would be an issue. That's what I get for assuming.
Thanks,
Gabriel
-----Original Message-----
From: Jamin W.Collins [SMTP:[EMAIL PROTECTED]]
Sent: Tuesday, February 19, 2002 10:09 PM
To: [EMAIL PROTECTED]
Subject: Re: [Masq] Using IP aliasing along with port redirect?
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/* ALSO: Don't quote this header. It makes you look lame :-) */
On Tue, 19 Feb 2002 19:10:27 -0600
"Gabriel Davidov" <[EMAIL PROTECTED]> wrote:
> I have a client/server program in which the server always sends tcp packets
> to a hard coded 1720 port. I would like to be
> able to run multiple clients on one machine and have tried using ip aliasing
> along with redirecting packets to get this done.
>
> I have added an extra IP alias, giving me two ip addresses on the box. My
> ifconfig looks like the following:
>
> eth0 Link encap:Ethernet HWaddr 00:ff:27:ff:18:76
> inet addr:xxx.xxx.xxx.42 Bcast:xxx.xxx.xxx.63
(snip)
> eth0:0 Link encap:Ethernet HWaddr 00:ff:27:ff:18:76
> inet addr:xxx.xxx.xxx.43 Bcast:xxx.xxx.xxx.63
(snip)
> The first client runs on eth0/port 1720 and runs fines. I am running a
> second client on port 1721 using the eth0:0 ip address. When the server
> attempts to make a tcp connection back to xxx.xxx.xxx.43 port 1720, I want
> to redirect it to port 1721 instead since my first client is already using
> port 1720. To do this, I have setup an ipchains rule as follows:
Silly question, but why are you trying to use a different port on the second IP? IIRC, since this is a different IP (even though it is aliased), it has it's own set of ports thus 1720 isn't used on eth0:0. Someone please correct me if I'm wrong here. However, I use aliases myself and haven't run into a port conflict of any kind.
Jamin W. Collins
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