[pptp-server] Routing & Ping-Problem

[Josh Howlett]

Post your routing table and arp table on your VPN gateway...

josh.

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Josh Howlett, Network Supervisor,
Networking & Digital Communications,
Information Systems & Computing,
University of Bristol, U.K.
0117 928 7850 | josh.howlett at bris.ac.uk
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On Thu, 5 Jul 2001, max4eu.net Support wrote:

> Hallo,
> 
> I know, old thing, but new Problem:
> 
> I will use pptp to tunnel via a dyn-ISP-DialUP fixed IP4s to my customers
> from my own Adresspool (For statistic-services, like mysql, etc.)...
> 
> My Problem is, booth sides are doesn4t routing. Only the tunnel-PC4s can
> ping the pptp-Partner.
> 
> I made a lot of trys. with proxyarp, without proxyarp, with statitic-routes
> (all variants). - no forwarding :-((
> 
> Generally:
> 
> ip_forward=1 and proxy_arp=1 are set on booth sides ! - No Firewall was
> enabled in booth machines. I use Kernel 2.4.6p6 (same result with 2.2.19,
> too)
> 
> My Situation:
> 
> 
> VPN-Gate: 80.64.128.5
> 
> Destination-IP4s: 80.64.132.0 - 7 to customer.
> 
> Booth routes 80.64.128.0/24 and 80.64.132.0/24 are routed from the
> border-gateway (Cisco) via FastEthernet to the whole network. (For reachable
> from the world-internet-site...)
> 
> On the VPN-Machine after a pptp-tunnel was established a route was set
> (80.64.132.0/29) to ppp0. included prox-arp.
> 
> I see with iptraf on the destination site, ICMP-Request for all 6 IP4s
> (.2-.6) are goes through the tunnel, but would be never answered from an
> fastethernet on the other side. Only when the packets comes from the vpngate
> itself. I Asume, i have a problem with enable_Forwarding, but i don4t use
> iptables or other things (not needed).
> 
> On the peer-site i setup a route 80.64.132.0/29 send too ppp0, the rest,
> included the physical tunnel, goes via ippp0 (!) / ISDN to the dyn-provider.
> 
> The Problem exists on booth sides, No traffic outside the vpngate, no
> traffic to the other machines on the lan from the dial-IN-Router.
> 
> I made trys with all ip4s on booth sides in the same subnet, in different
> subnets, all times the sames problem, no routing :-((
> 
> Any Hints for me for my kernel 2.4.6 and my config ?
> 
> Regards,
> Ernst
> 
> 
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