Hi!
I am looking for a possibility to connect two network bridges to each other
such as br0 and br1.
Since one network interface can only be enslaved to one single network bridge,
I thought about connecting two virtual network interfaces e.g. if0 and if1 to
each other such as ethernet packets sent out to if0 come back on if1 and vice
versa. Is there a possibility to achieve this?
What about connecting two tap interfaces such as outputs from /dev/tap0 are
written to /dev/tap1 and vice versa?
How can I do this in the simplest way?
I did not find any documentation on this. So I thought about asking you, since
vtun uses tap devices, so you surely know about that.
My Idea is like this:
normal state: failure of eth0: implementation idea:
--ethernetsegment-- --ethernetsegment-- --ethernetsegment--
| | | | |
eth0 eth1 eth1 eth0 eth1
| | | | |
br0---------br1 br0---------br1 br0--vnet0 br1---vnet1
| | | | | |
vnet0 vnet1 vnet0 vnet1 tap0 tap1
| |
/dev/tap0<->/dev/tap1
The loop in normal state would be permitted by spanning tree. In case of
failure of one network interface (eth0), all affected interfaces could still be
reached over the connection between br0 and br1.
What I already tried is: Using vtun over the loopback device (lo). So I started
vtund as server and client on the same system and enslaved tap0 to br0 and tap1
to br1.
It works! That's really cool! ;-)
But this solution has some overhead. The two vtund processes are really busy
with encapsulation and decapsulation work. They reach 100% cpu usage of one
core on my machine each. But the achieve at least 50 MByte/s throughput
(duplex) which results in 100 MByte/s on the loopback device (lo) (also
duplex). That's not bad, but I'd like to strip some overhead and let /dev/tap0
and /dev/tap1 talk to each other more directly (without en-de-capsulation).
Could you help me find a better solution?
Best regards
Christian
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