I am trying to connect a VPN through my wrt54gl (KAMIKAZE (7.07))
I am NOT trying to use the router for the VPN.  A windows PC -> wrt54gl -> remote VPN router.

I have found in the forum    "ipkg install kmod-ipt-nat-pptp  (older version should use 'kmod-ipt-nat-extra' instead)",  but I can't find any package like that for kamikaze. 

root@OpenWrt:~# ipkg list | grep ipt-nat
kmod-ipt-nat - 2.4.34-brcm-1 - Modules for extra NAT targets
kmod-ipt-nathelper - 2.4.34-brcm-1 - Default Conntrack and NAT helpers
kmod-ipt-nathelper-extra - 2.4.34-brcm-1 - Extra Conntrack and NAT helpers

root@OpenWrt:~# ipkg list | grep pptp
pptp - 1.6.0-3 - PPTP client
pptpd - 1.3.0-1 - PopTop pptp server

some of a tcpdump is listed here...
--- WAN interface   #tcpdump -i eth0.1
21:22:04.904677 IP vpnSrvr.1723 > myWanIP.4652: P 213:229(16) ack 349 win 8452: pptp CTRL_MSGTYPE=ECHORQ ID(1)
21:22:04.906170 IP myWanIP.4652 > vpnSrvr.1723: P 349:369(20) ack 229 win 65307: pptp CTRL_MSGTYPE=ECHORP ID(1) RESULT_CODE(1) ERR_CODE(0)
21:22:05.474433 IP vpnSrvr.1723 > myWanIP.4652: . ack 369 win 8432
21:22:05.995021 IP vpnSrvr > myWanIP: GREv1, call 49152, seq 4, length 25: LCP, Conf-Request (0x01), id 4, length 11
21:22:05.995697 IP myWanIP > vpnSrvr: ICMP myWanIP protocol 47 unreachable, length 53
21:22:08.995231 IP vpnSrvr > myWanIP: GREv1, call 49152, seq 5, length 25: LCP, Conf-Request (0x01), id 5, length 11
21:22:08.995917 IP myWanIP > vpnSrvr: ICMP myWanIP protocol 47 unreachable, length 53
21:22:11.995208 IP vpnSrvr > myWanIP: GREv1, call 49152, seq 6, length 25: LCP, Conf-Request (0x01), id 6, length 11
21:22:11.995878 IP myWanIP > vpnSrvr: ICMP myWanIP protocol 47 unreachable, length 53
21:22:14.996110 IP vpnSrvr > myWanIP: GREv1, call 49152, seq 7, length 25: LCP, Conf-Request (0x01), id 7, length 11
21:22:14.996787 IP myWanIP > vpnSrvr: ICMP myWanIP protocol 47 unreachable, length 53
--- LAN interface   #tcpdump -i eth0.0
21:22:04.905141 IP vpnSrvr.1723 > 192.168.10.2.4652: P 213:229(16) ack 349 win 8452: pptp CTRL_MSGTYPE=ECHORQ ID(1)
21:22:04.905711 IP 192.168.10.2.4652 > vpnSrvr.1723: P 349:369(20) ack 229 win 65307: pptp CTRL_MSGTYPE=ECHORP ID(1) RESULT_CODE(1) ERR_CODE(0)
21:22:05.474856 IP vpnSrvr.1723 > 192.168.10.2.4652: . ack 369 win 8432
21:22:06.258683 IP 192.168.10.2 > vpnSrvr: GREv1, call 54349, seq 3, length 37: LCP, Conf-Request (0x01), id 3, length 23
21:22:10.258767 IP 192.168.10.2 > vpnSrvr: GREv1, call 54349, seq 4, length 37: LCP, Conf-Request (0x01), id 4, length 23
21:22:14.258852 IP 192.168.10.2 > vpnSrvr: GREv1, call 54349, seq 5, length 37: LCP, Conf-Request (0x01), id 5, length 23

I have tried various iptables rules, but nothing seems to work.

Is there some other package for kamikaze which does what "kmod-ipt-nat-pptp" did?

Thanks

Try installing the "kmod-gre" package, that should help.

OK - that seems to have helped.

now my problem is - I can only make 1 connection at a time
well, it seems to be more like I can make a connection if no other connection entry exists in /proc/net/ip_conntrack

any idea of what the kamikaze equivalent of ipkg install kmod-ipt-nat-extra is?

Thanks

From looking at my installed packages' names, I would guess kmod-ipt-nathelper-extra.

That works !!     (almost)

When I disconnect the VPN tunnel, the router reboots.

Any ideas?

Thanks

Yeah, known problem of the 2.4 kernel. Only solution is using a 2.6 kernel, but that most probably means unusable wifi (although there seem to be a few who successfully use the b43 driver).
So you have the choice between wireless and no crashes.

Thanks.

I guess I will live with the crashes for now.  Maybe I will go back to the single VPN tunnel.