[pptp-server] pptp, gre, adsl firewllas and nat
John Leach
john at ecsc.co.uk
Fri May 25 17:13:06 CDT 2001
On 23 May 2001 12:11:34 +0100, Tim Small wrote:
> I've found CIPE to work quite well in this situation (one end BT ADSL -
> NATed through a win98 box because I can't get the Linux Speedtouch USB
> driver working stably :-( - the other end a permanently connected host).
>
Ah, I had the BT flowpoint router, which is set up to NAT by default. I
broke into it and snooped around a bit, turned on protocol 47 forwarding
just in case. I do see gre traffic at both ends using tcpdump, so I
assume all is well on that front.
> One thing that might be worth doing is knocking the MTU/MRU down -
> probably something around 1400 will do it, not that the NAT boxes should
> be choking on GRE fragments, but it is worth a try, and will help
> performance, if you do get it working.
>
I shall try this again, I did fiddle with the mtu/mru but only reduced
it if I remember correctly, I'll report results here, thanks.
> CIPE encapsulates over UDP, and doesn't have any problem with any
> mainstream NAT equipment.
I'd prefer CIPE or proper IPSEC myself, but some lusers needs access
from their win boxes *sigh*
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