Re: ipfw and mail

From: Gustavo A. Baratto (gbaratto_at_superb.net)
Date: 06/25/04

  • Next message: Ondra Holecek: "Re: ipfw and mail" 
    Date: Fri, 25 Jun 2004 11:21:38 -0700
To: freebsd-isp@freebsd.org, Ondra Holecek <bln@bln.no-ip.org>

    Thank you very much... but I think it doesnt work :(

    umail7# ipfw delete 200
    umail7# ipfw add 200 fwd localhost:25 tcp from any to me 2525 keep-state
    01400 fwd 127.0.0.1,25 tcp from any to me dst-port 2525 keep-state
    umail7# telnet 207.228.225.128 2525
    Trying 207.228.225.128...
    telnet: connect to address 207.228.225.128: Connection refused
    telnet: Unable to connect to remote host

    I tried the IP as well, instead of localhost... it doesnt work.

    look the telnet response from port 25:
    -bash-2.05b$ telnet 207.228.225.128 25
    Trying 207.228.225.128...
    Connected to smtp3.superb.net.
    Escape character is '^]'.
    220 smtp3.superb.net ESMTP

    thanks :)

    ----- Original Message -----
    From: "Ondra Holecek" <bln@bln.no-ip.org>
    To: <freebsd-isp@freebsd.org>
    Sent: Friday, June 25, 2004 11:10 AM
    Subject: Re: ipfw and mail

    > On Friday 25 June 2004 20:00, Gustavo A. Baratto wrote:
    > > Hello guys,
    > >
    > > some of our users' ISPs don't allow them to use port 25, so they cannot
    use
    > > out mail server.
    > >
    > > I want to open a new port (2525) and forward all packets from 2525 to 25
    > > so, they can use mail.
    > >
    > > I tried this in IPFW:
    > > 0100 119649 44772439 allow tcp from any to me dst-port 25 keep-state
    > > 0200 0 0 divert 25 ip from any to me dst-port 2525
    keep-state
    > ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    > this line does something other
    > try to use this:
    > ipfw delete 200
    > ipfw add 200 fwd localhost:25 tcp from any to me 2525 keep-state
    >
    >
    > > 0300 103075 35531648 allow ip from me to any keep-state
    > > 0400 60 4530 deny log ip from any to any
    > >
    > >
    > > If I telnet directly to port 25, I can get the prompt, but if I telnet
    to
    > > port 2525, I get a connection refused.
    > >
    > > What should I do in ipfw to forward port 2525 to port 25 tranparently?
    > >
    > > Thanks
    > > _______________________________________________
    > > freebsd-isp@freebsd.org mailing list
    > > http://lists.freebsd.org/mailman/listinfo/freebsd-isp
    > > To unsubscribe, send any mail to "freebsd-isp-unsubscribe@freebsd.org"
    >
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