>На linux:
>
>ip tunnel add ipip1 mode ipip local 91.144.150.13 remote 91.144.149.70
>ifconfig ipip1 172.20.1.1 netmask 255.255.255.0 mtu 1400
>
>На cisco:
>
>interface Tunnel0
>ip address 172.20.1.2 255.255.255.0
>ip mtu 1400
>tunnel source Loopback0
>tunnel destination 91.144.150.13
>tunnel mode ipip
>
>
>Смотрим:
>
>Tunnel0 is up, line protocol is up
>Hardware is Tunnel
>Internet address is 172.20.1.2/24
>MTU 1514 bytes, BW 9 Kbit, DLY 500000 usec,
>reliability 255/255, txload 1/255, rxload 1/255
>Encapsulation TUNNEL, loopback not set
>Keepalive not set
>Tunnel source 91.144.148.70 (Loopback0), destination 91.144.150.13
>Tunnel protocol/transport IP/IP
>Tunnel TTL 255
>Fast tunneling enabled
>
>Пингуем:
>
>ping 172.20.1.1
>Type escape sequence to abort.
>Sending 5, 100-byte ICMP Echos to 172.20.1.1, timeout is 2 seconds:
>!!!!!
>Success rate is 100 percent (5/5), round-trip min/avg/max = 1/2/4 ms
>
>Радуемся жизни. На линуксе:
ip tunnel add ipip1 mode ipip local 192.168.2.1 remote 192.168.1.1
ifconfig ipip1 192.168.3.2 netmask 255.255.255.0 mtu 1514
eth0 Link encap:Ethernet HWaddr 00:0C:F1:6B:61:CE
inet addr:192.168.2.1 Bcast:192.168.2.255 Mask:255.255.255.0
inet6 addr: fe80::20c:f1ff:fe6b:61ce/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:2051 errors:0 dropped:0 overruns:0 frame:0
TX packets:86 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:199589 (194.9 Kb) TX bytes:11870 (11.5 Kb)
Interrupt:20
ipip1 Link encap:IPIP Tunnel HWaddr
inet addr:192.168.3.2 P-t-P:192.168.3.2 Mask:255.255.255.0
UP POINTOPOINT RUNNING NOARP MTU:1514 Metric:1
RX packets:262 errors:0 dropped:0 overruns:0 frame:0
TX packets:262 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:22008 (21.4 Kb) TX bytes:27248 (26.6 Kb)
На циске:
interface Tunnel0
ip address 192.168.3.1 255.255.255.0
ip mtu 1514
tunnel source 192.168.1.1
tunnel destination 192.168.2.1
tunnel mode ipip
#show interfaces tunnel0
Tunnel0 is up, line protocol is down
Hardware is Tunnel
Internet address is 192.168.3.1/24
MTU 1514 bytes, BW 9 Kbit, DLY 500000 usec,
reliability 255/255, txload 1/255, rxload 1/255
Encapsulation TUNNEL, loopback not set
Keepalive not set
Tunnel source 192.168.1.1, destination 192.168.2.1
Tunnel protocol/transport IP/IP
Tunnel TTL 255
и совсем не радуемся жизни :(
тоже самое если маска /30
