Date: Tue, 15 Jun 1999 17:13:16 +0200 From: Erik de Zeeuw <erik@univ-lehavre.fr> To: freebsd-questions@freebsd.org Subject: NAT/Masquerading question Message-ID: <37666D8C.68DABBC@univ-lehavre.fr>
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Hi,
I have to deal with 30 X Terminals, each one with its own public
C class ip adress. The problem is that my C class adress space is
getting shorter, and it would be a great thing to set up the
terminals so that they only have a private ( 192.168.* ) adress.
To achieve this, I grabbed a p133/32Mb/2Gb with one 3Com NIC ( 3c900
combo ) and a cheap NE2000 compatible, and installed a brand new
FreeBSD 3.2-RELEASE on it.
As I already use ipfw on another machine, I decided to use IPFilter
to have a look at it.
Everything seems to work OK, I used ipnat to do some NAT and hide
the terminals behind the public address of the FreeBSD gateway.
Terminals -------------> FreeBSD Gateway -------------> Outside
( 192.168.0.*) (192.168.0.1) (194.x.x.x )
ne2000/ed1 3Com/xl0
I used the following ipnat rules :
map xl0 192.168.0.0/24 -> 194.X.X.X/32 portmap tcp/udp 40000:65000
map xl0 192.168.0.0/24 -> 194.X.X.X/32
The ping is ok from the terminals to the outside, and the telnet is
working fine.
The problem is that the X connections does not work. I read some more
docs about NAT since, and it seems I have to use some kind of X
proxy to make it work.
Question is, where can I find a kind of X proxy ? The servers on
which the terminals should connect are of several species ( Linux,
Solaris 2.7, and an Irix 6.4 ).
Another question is if there exists some other way to make the X
connections work through the NAT gateway, may be using port
redirection or other little toys ? May be using more than one real
ip adress would help.
If some of you did succeed in setting this kind of thing, I would be
pleased to hear from them. I didn't checked the other way : natd, but
I think it will give the same results, at least from the docs I've
read.
Thanks in advance,
Erik de Zeeuw,
Universite du Havre,
erik@univ-lehavre.fr
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