lug-bg: gre tunnel problem

[izarov@xxxxxxx (Ilian Zarov)]

   Zdravejte,
imam edin mnogo stranen problem s gre tunnel.
Celta e da se podkara gre tunnel m/u dve linux mashini (2.4 kernel). 
S tcpdump gledam paketite i na dvete mashini i na pryv pogled
vsichko ok - ednata mashina si prashta request, drugata si otgovarq. 
No samoto prilojenie kato che li ne poluchava tezi paketi. Naprimer ping: 
13:27:47.973700 192.168.250.59 > 192.168.250.60: 192.168.150.59 >
192.168.250.60: icmp: echo request (DF) (gre encap)
13:27:47.974309 192.168.250.60 > 192.168.250.59: 192.168.250.60 >
192.168.150.59: icmp: echo reply (gre encap)
.250.xx sa realnite ip-ta na mashinite (v smisyl ip-tata na mrejovite
karti). .150.xx sa ip-tata na tunnel-ite.
Iptunnel-a go puskam po sledniq nachin:
na mashina .xxx.60:

iptunnel add tunnel0 mode gre remote 192.168.250.59 local 192.168.250.60
dev eth2 ttl 64
ifconfig tunnel0 192.168.150.60 netmask 255.255.255.255 dstaddr 192.168.150.59
route add -host 192.168.250.59 dev tunnel0
iptables -I FORWARD -p udp
iptables -I FORWARD -p tcp --tcp-flags SYN,RST SYN -j TCPMSS
--clamp-mss-to-pmtu

na mashina .xxx.59:

iptunnel add tunnel0 mode gre remote 192.168.250.60 local 192.168.250.59
dev eth0 ttl 64
ifconfig tunnel0 192.168.150.59 netmask 255.255.255.255 dstaddr 192.168.150.60
route add -net 192.168.250.0/24 dev tunnel0 
iptables -I FORWARD -p udp
iptables -I FORWARD -p tcp --tcp-flags SYN,RST SYN -j TCPMSS
--clamp-mss-to-pmtu

Blagodarq.
                Pozdravi,
                        Ilian Zarov

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