[pptp-server] pptp masquerade document needed for 2.4.x based firewal

[Jamin Collins]

Craig Morris [mailto:craig at amalgam.ca]
> Here is the output from modprobe:
> 
> modprobe -v iptable_nat
> /sbin/insmod
> /lib/modules/2.4.3-12/kernel/net/ipv4/netfilter/ip_conntrack.o
> Using /lib/modules/2.4.3-12/kernel/net/ipv4/netfilter/ip_conntrack.o
> Symbol version prefix ''

Not sure on this one.

> /lib/modules/2.4.3-12/kernel/net/ipv4/netfilter/ip_conntrack.o:
> init_module: Device or resource busy

Ah, I know this little bugger.  We'll get to him in a bit (1).

> Hint: insmod errors can be caused by incorrect module parameters,
> including invalid IO or IRQ parameters

Related to above.

> /lib/modules/2.4.3-12/kernel/net/ipv4/netfilter/ip_conntrack.o: insmod
> /lib/modules/2.4.3-12/kernel/net/ipv4/netfilter/ip_conntrack.o failed
> /lib/modules/2.4.3-12/kernel/net/ipv4/netfilter/ip_conntrack.o: insmod
> iptable_nat failed

Also related to above

 
> And here are the currently loaded modules:
> 
> [root at shockwave init.d]# lsmod 
> Module                  Size  Used by
> ne2k-pci                4096   2  (autoclean)
> 8390                    5632   0  (autoclean) [ne2k-pci]
> ipchains               27648   0  (unused)

(1) And here is the key.  You see that you have ipchains loaded.  The
modules you are trying to load are iptables modules.  The two can not both
be loaded.  You must unload ipchains to get the iptables stuff loaded.
 
> I'm still using ipchains instead of iptables, although I'm not sure if
> it makes any difference.

Yep, it makes all the difference.

Jamin W. Collins