Re: [hylafax-users] Hylafax Client - Server problem

[Kimble Young <kimble@xxxxxxxxxxxxxxx>]

I have to agree here.

To the ftp connection tracking modules hylafax looks identical to an ftp 
session. You just need to tell it to use port 4559.

I have it working on several machines with no problems.

Regards,

Kimble Young

An Intrepid HylaFax User wrote:
> > According to previous discussion on fax client and server through FTP
> > port 4559, no one can answer this firmly.
> >
> > What I think is that this is a problem due to NAT. This situation occurs
> > similarly in Voice Over IP (VOIP). For example, in SIP, NAT will only
> > change the source IP address for LAYER 3 only, but those embedded in IP
> > message at or above Layer 4 (TCP/UDP layer or above) will not be
> > translated to the NAT address. A voice channel (UDP) cannot be
> > established as internal IP address is un-routeable. This can be solved
> > by installing STUN server or Tunneling techniques.
>
>
> If you're using Linux as a router, you can configure your ip_nat_ftp module to
> do protocol inspection for the hylafax ports as well as ftp.  Linux provides a
> a rich set of flexible NAT and conntrack helpers which work with protocols
> like FTP and IRC which pass around IP#s around as part of its session
> conversations.
>
> These topics are covered at length by various HOWTOs and FAQs.  The Hylafax
> protocol looks almost identical to FTP's with respect to its file xfer
> commands, so I suspect adding the hylafax ports to the nat/conntrack ftp
> helpers will "make it all work" like magic.
>
> =R=
>
>
>
>
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