Hi,

I need to use the same port on eth0 and eth0:1 but it seems it does not work.
Eth0 is allocated by an application which listens port 33000.
On eth0:1 I would need to run sshd, port 33000, but I get "error: Bind to port 33000".
Is it possible to share the same port with virtual ethernet?

For security reason I am able to use only port 33000.

Thank you.

Luke

You can use the same port on different interfaces regardless if they are real or virtual. In your case, I guess you bring up the virtual interface first, then you start your application, so it listens on both eth0 and eth0:1 on port 33000 and sshd cannot start.
What you should do is to first start you app, so it binds only on eth0, then bring up eth0:1 and start sshd using in sshd_config:
where x.x.x.x is the eth0:1 ip address.

Regards

Ok it works. I forgot my application was listening INADDR_ANY and had to set specific eth0 IP.

By the way, making a bit more complicate, I run in situation where there is a firewall between my server and client. The firewall has only one port forwarding to my eth0 and nothing to virtual eth.
In such situation I need to have 2 sockets in listening, my application and sshd, but I have all traffic coming on eth0.
From client pc I need to connect to my server application and also time by time connect to sshd. On the firewall I can only have 1 port forwarding.
Is it possible to have a mechanism on my server to listen 33000 on eth0 and re-route the ssh traffic to eth0:1 and the rest to my application on eth0?

Thx.
Luke

The only application that comes in my mind and can do what you want, is a portal server running some custom made java applets, that allow a remote user to access resources on the server using the portal's web interface.