Re: VoIP and IPFW

From: Maksim Yevmenkin (maksim.yevmenkin_at_savvis.net)
Date: 09/08/04

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    Date: Wed, 08 Sep 2004 14:41:19 -0700
To: Gary Corcoran <garycor@comcast.net>

    Gary Corcoran wrote:
    > Maksim Yevmenkin wrote:
    >
    >> Hello,
    >>
    >>> I'm considering testing the Vonage service, with my FreeBSD-4.10
    >>> system (maybe 5 or 6). I wonder if anyone here has a configuration
    >>> they can share, or if there are any pages out there that detail the
    >>> proper (and secure) setup.
    >>
    >>
    >>
    >> i'm using lingo (www.lingo.com) - very similar to vonage. i use
    >> freebsd 4.10 as my firewall/nat/wireless access point/etc. the lingo
    >> box in behind freebsd box. it gets its ip (local) via dhcp and then
    >> talks to the lingo servers (via nat). it seems both providers are
    >> using sip, so i did not have to open anything on my nat/firewall,
    >> because the lingo box initiates the connection from the inside.
    >
    > I can understand how you can do outgoing calls behind a NAT firewall,
    > because you initiate the connection. But can you receive *incoming*
    > calls? Or are you always "connected" to the VOIP provider, and thus
    > your firewall/reverse-nat is always open/setup?

    yes, the lingo box is 'always "connected"', so incoming calls work just
    fine. one more thing - i had to give ntp servers list in the dhcp
    response to the lingo box, otherwise caller id time was way off :)

    max
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