Cisco. GRE-туннель

Имеется Cisco 1841 и Cisco 1760. Задача поднять туннель для связи двух офисов.

C1841

wan ip 190.10.10.10
local ip 192.168.1.0/24 

C1760

wan ip 200.20.20.20
local ip 192.168.2.0/24 

На 1841 делаем:

interface Tunnel1
 description OFFICE1-TO-OFFICE2
 ip address 10.10.10.1 255.255.255.252
 ip access-group NETBIOS in
 ip tcp adjust-mss 1436
 tunnel source 190.10.10.10
 tunnel destination 200.20.20.20
 tunnel path-mtu-discovery

ip route 192.168.2.0 255.255.255.0 Tunnel1

На 1760 делаем:

interface Tunnel1
 description OFFICE2-TO-OFFICE1
 ip address 10.10.10.2 255.255.255.252
 ip access-group NETBIOS in
 ip tcp adjust-mss 1436
 tunnel source 200.20.20.20
 tunnel destination 190.10.10.10
 tunnel path-mtu-discovery

ip route 192.168.1.0 255.255.255.0 Tunnel1