[ale] VPN connections through firewall

[Gary S MacKay]

I have a Win2K pro machine behine a linux machine running RedHat 7.0
with 2.2.16-22 kernel. I've installed the ip_masq_pptp module also. When
I try to connect to the remote site, it will get to the point of
"Verifing password..." and then timeout. I have verified that the remote
site works by dialing into the internet via modem from the Win box and I
can connect to the VPN just fine.

Problem:
Whenever I try to connect to a Netopia R910 router at a client site, I
get these entries from a tcpdump on my firewall:

10:51:00.823238 > myIP > remoteIP: icmp: myIP protocol 47 unreachable
[tos 0xc0]
10:51:03.463238 > gre-proto-0x880B (gre encap)
10:51:03.813238 < gre-proto-0x880B (gre encap)
10:51:03.813238 > myIP > remoteIP: icmp: myIP protocol 47 unreachable
[tos 0xc0]

It just repeats until the Win box times out with an error that a port
was not connected.

Question:
What piece of the puzzle am I missing?

- Gary
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