Hi,
I'm trying to setup a GRE tunnel between an Ubuntu system and a UML (running on
a different system). This is how the systems were configured:
1. UML
Boot arguments: ./vmlinux ubd0=guest3,uml-ext2-img con0=null con=fd:0,fd:1
umid=guest3 mem=32m eth0=tapng,,tap1 eth1=gre,,10.0.0.1,10.0.0.2,9
cgroup_disable=memory init=/etc/preinit
root@OpenWrt:/# ifconfig
eth0 Link encap:Ethernet HWaddr 5A:86:C4:0D:19:F5
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:43 errors:0 dropped:22 overruns:0 frame:0
TX packets:777 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:2321 (2.2 KiB) TX bytes:312354 (305.0 KiB)
Interrupt:5
eth1 Link encap:Ethernet HWaddr 76:5A:7B:B7:D9:F6
inet addr:192.168.252.1 Bcast:192.168.252.255 Mask:255.255.255.0
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:611 errors:0 dropped:611 overruns:0 frame:0
TX packets:1 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:42518 (41.5 KiB) TX bytes:402 (402.0 B)
Interrupt:5
lo Link encap:Local Loopback
inet addr:127.0.0.1 Mask:255.0.0.0
UP LOOPBACK RUNNING MTU:16436 Metric:1
RX packets:0 errors:0 dropped:0 overruns:0 frame:0
TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:0 (0.0 B) TX bytes:0 (0.0 B)
2. Ubuntu
This is the entry I added to /etc/network/interfaces:
auto gre1
iface gre1 inet static
address 192.168.252.110
netmask 255.255.255.252
pre-up iptunnel add gre1 mode gre local 10.0.0.1 remote 10.0.0.2 ttl 255
up ifconfig gre1 multicast
pointtopoint 192.168.252.1
post-down iptunnel del gre1
ubuntu# ifconfig
eth0 Link encap:Ethernet HWaddr 78:e7:d1:c6:23:71
inet addr:10.0.0.1 Bcast:10.78.49.255 Mask:255.255.255.0
inet6 addr: fe80::7ae7:d1ff:fec6:2371/64 Scope:Link
inet6 addr: 2001:220:abcd::20/64 Scope:Global
inet6 addr: 2001:220:abcd:70::26/64 Scope:Global
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:3331 errors:0 dropped:284 overruns:0 frame:0
TX packets:543 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:1200307 (1.2 MB) TX bytes:114051 (114.0 KB)
Interrupt:17
gre1 Link encap:UNSPEC HWaddr
0A-4E-31-4B-00-00-00-00-00-00-00-00-00-00-00-00
inet addr:192.168.252.110 P-t-P:192.168.252.110 Mask:255.255.255.252
inet6 addr: fe80::5efe:a4e:314b/64 Scope:Link
UP POINTOPOINT RUNNING NOARP MULTICAST MTU:1476 Metric:1
RX packets:0 errors:0 dropped:0 overruns:0 frame:0
TX packets:3 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:0 (0.0 B) TX bytes:168 (168.0 B)
The ubuntu box is able to ping the IP 192.168.252.1, but strangely I don't see
packets going out to 10.0.0.2. Also, the UML is not able to ping
192.168.252.110.
Is this configuration correct or is there something missing?
Thanks!
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