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I am trying to masquerade a VPN server (WinNT) behind my linux firewall.
However, I am having problems getting it to work. I have applied the
vpn-masquerade patch for my kernel version (2.2.17) and installed the
appropriate tools (ipmasqadm and ipfwd). It seems like ipfwd works and
forwards the GRE packets to the NT server but it appears that the tcp
packets never reach it on port 1723. I know that I have set up my rules and
tools correctly because they are identical to another person's setup who has
this working. This leads me to believe that something is not working on my
linux box. I did a port scan on it and found that port 1723 is in a closed
state. Does this mean that pptp masq is not enabled. I compiled the
required options into the kernel, but not as modules. Is it perhaps
necessary to do them as modules and then load them using modprobe or insmod
or whatever command it is? I am also using seawall-4.0.2 to set up my
firewall as it allows easy configuration of masquerading. I'd appreciate
any suggestions.
Just to summarize, here is what I have done.
Download kernel 2.2.17
Apply vpn_masq patch for 2.2.17
Configure kernel options as described in VPN-masq HOWTO
Compile new kernel
Download, configure and install ipmasqadm and ipfwd
Download and configure seawall-4.0.2
Start firewall (sets up ipchains, ipmasqadm portfw and ipfwd rules)
Have I missed anything here?
Thanks,
Darren
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