Salut,

    Am mare nevoie de ajutor referitor la problema din titlu. Incerc din 
rasputeri sa rezolv problema si inca nu am reusit sa fac sa mearga site-uri gen 
www.microsoft.com si www.downloads.com prin tunel gre intre linux debian si 
cisco 831.
    Pe tunel la linux am urmatoarele setari :

tunnel1   Link encap:UNSPEC  HWaddr 
56-6B-E9-52-00-00-00-00-00-00-00-00-00-00-00-00  
          inet addr:172.16.0.1  P-t-P:172.16.0.1  Mask:255.255.255.252
          UP POINTOPOINT RUNNING NOARP  MTU:1452  Metric:1
          RX packets:316581 errors:0 dropped:0 overruns:0 frame:0
          TX packets:232808 errors:12 dropped:0 overruns:0 carrier:6
          collisions:0 txqueuelen:0 
          RX bytes:301784681 (287.8 MiB)  TX bytes:144384948 (137.6 MiB)

Interfata fizica peste care se face tunelul are :

eth4      Link encap:Ethernet  HWaddr 00:04:23:B5:8F:BD  
          inet addr:  Bcast:  Mask:
          inet6 addr: fe80::204:23ff:feb5:8fbd/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:548646 errors:0 dropped:0 overruns:0 frame:0
          TX packets:271179 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000 
          RX bytes:386746931 (368.8 MiB)  TX bytes:153498280 (146.3 MiB)
          Base address:0xdc00 Memory:e5480000-e54a0000


Pe Cisco 831 am urmatoarele setari : 

interface Tunnel0
 description GRE-to-MSAT-c3620vpn
 ip address 172.16.0.2 255.255.255.252
 ip mtu 1452
 tunnel source Ethernet1
 tunnel destination 86.107.233.82
end

interface Ethernet1
 description WAN Link
 ip address 
 no ip redirects
 no ip unreachables
 no ip proxy-arp
 load-interval 30
 duplex auto
 hold-queue 256 in
 hold-queue 256 out
end

#sh ip interface Ethernet1
Ethernet1 is up, line protocol is up
  Internet address is 
  Broadcast address is 255.255.255.255
  Address determined by non-volatile memory
  MTU is 1500 bytes
  Helper address is not set
  Directed broadcast forwarding is disabled
  Outgoing access list is not set
  Inbound  access list is not set


#sh ip interface tunnel 0
Tunnel0 is up, line protocol is up
  Internet address is 172.16.0.2/30
  Broadcast address is 255.255.255.255
  Address determined by non-volatile memory
  MTU is 1452 bytes
  Helper address is not set
  Directed broadcast forwarding is disabled
  Outgoing access list is not set
  Inbound  access list is not set



Va rog sa ma ajutati sa pot accesa si acele site-uri prin gre. Daca incerc sa 
pun mtu 1476 imi da urmatoarea eroare : 

GREv0, length 1456: IP truncated-ip - 24 bytes missing! 86.107.224.2.2382 > 
64.156.47.210.3002



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