I'm working on a Centos project where I'd like to have a service as per below in order to forward the SMTP & POP3 ports (25 & 110) in two different mail servers. The below are now online and everything works properly for one Mail Server. My question is how to add a second service or add on the below service commands, in order to forward at 5551 & 5551 the SMTP & POP3 Ports to a second mail Server (in case we have failure in the first Email Server) automatically. Your kind assistance will be greatly appreciated.

Services at /etc/xinetd.d:

service smtp_1

{

groups = yes

port = 5551

bind = 172.2.16.10 -- > (local IP Email client)

socket_type = stream

protocol = tcp

user = root

server = /usr/bin/ssh

server_args = -q -C -T -p 22 root@xxx.xxx.xxx.xxx --> Public IP nc xxx.xxx.xxx.xxx --> Local IP Mail Server IP 25

type = UNLISTED

wait = no

}

service pop3_1

{

disable = no

socket_type = stream

protocol = tcp

port = 5552

wait = no

user = root

server = /usr/bin/ssh

server_args = -q -C -T -p 22 root@xxx.xxx.xxx.xxx -- > Public IP nc xxx.xxx.xxx.xxx -- > Local IP Mail Server 110

groups = yes

bind = 172.2.16.10 -- > Loacal IP Email Client

}

You need to get the tunneling working manually first. Please re-read the manual for the SSH client.

The option you are looking for would be -L

Also please wrap the configuration text in [code] [/code] tags.

Hello and many thanks for your reply,

I will be more specifi in the above. Now i am forwarding 5551 & 5552 via the above services at 25 & 110 SMTP & POP3 to an email server. The above services running with success. My question is how to add a second Email Server in order to forward my email if the first email server has a failure. Could you please be more specific about -L ssh option.

Many thanks again.

Yes but you must read about -L, -i, and the other options you are using in the manual page:

Then get it working from the shell manually before messing with xinetd

Then get it working with keys.

Then add it to xinetd's configuration.