Access through a Linux firewall

How do we enable users outside our Linux firewall to access our Microsoft exchange server inside the firewall. we're using a 192. address group inside, and the firewall has a 192. address on the inside.
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slang9Asked:
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j2Commented:
locate which ports / protocols the exchange uses, and use ipforward / ipportfw to forward them, however, afaik you cannot "masquerade" an exchange server (unbless you ONLY use ports 25 and 110 (smtp / pop) )
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castleinfoCommented:
You don't say what kernel version you are using i.e. IPCHAINS or IPFWADMIN.. I'd like to do the same thing using IPCHAINS etc....I believe ipportfw and ipforward only work with a 2.0 kernel? (i'm using red hat 6.0)
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j2Commented:
Nope, same tools are available for 2.2 kernels, theyre even integrated to a certain extent.
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castleinfoCommented:
Oh... OK.. I found the following which is usefull :
http://www.redhat.com/mirrors/LDP/HOWTO/IP-Masquerade-HOWTO-6.html

But I'm to much of a WIMP to re-compile the kernel to get it working.
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j2Commented:
recompile kernel? why? rh6.x has all the support as default.
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castleinfoCommented:
I've done a full install of rh6 and I don't have ipforward / ipportfw or IPMASQADM in my /sbin directory am I looking in the wrong place ?
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j2Commented:
its not included by default. Just download it and install it. But you dont have to recompile anything to get it working. ipmasqadm and ipchains are all the tools you need.
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castleinfoCommented:
Fantastic thanks, I down loaded the RPM installed it and hey presto...I hijacked this question so I'm going to start another thread...
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slang9Author Commented:
We're using Caldera version 1.2
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