F5 and DNS reverse resolution of mail server

Hello Admins,

 

 

I have some problem with F5 Link Controller and my mail server.

 

When I config SNAT for the mail server to resolve the DNS reverse resolution, it seems doesn't work. The server always used the automap.

 

I have 2 internet connection but the mail only use one of them.

 

 

MAIL In: 10.10.10.10

 

MAIL Out: 20.20.20.20

 

 

vs {

 

name "VS_CNC_Mail_SMTP"

 

address 20.20.20.20:25 // smtp

 

}

 

vs {

 

name "VS_CNC_Mail_HTTP"

 

address 20.20.20.20:80 // http

 

}

 

 

pool Pool_Mail_HTTP {

 

monitor all http

 

member 10.10.10.10:http

 

}

 

 

pool Pool_Mail_SMTP {

 

monitor all tcp

 

member 10.10.10.10:smtp

 

}

 

 

snat SNAT_Mail {

 

translation 20.20.20.20

 

origin 10.10.10.10

 

}

 

 

virtual VS_CNC_Mail_HTTP {

 

destination 20.20.20.20:http

 

ip protocol tcp

 

pool Pool_Mail_HTTP

 

}

 

 

virtual VS_CNC_Mail_SMTP {

 

destination 20.20.20.20:smtp

 

ip protocol tcp

 

pool Pool_Mail_SMTP

 

}

 

 

virtual VS_Outbound_Any {

 

destination any:any

 

snat automap

 

persist dest_addr

 

pool Default_Gateway_Pool

 

}

 

 

A simple iRule does not work too.

 

 

when CLIENT_ACCEPTED {

 

if { [IP::addr [IP::client_addr] equals 10.10.10.10] }{

 

snat 20.20.20.20

 

}

 

}

 

 

I am a newcomer of F5. Anybody can help me?

 

Thanks