[ovs-discuss] ovs dpdk layer 3 port with neighbour protocol stack support
majieyue at huawei.com
Tue Nov 29 06:16:21 UTC 2016
When we deploy OVS as NAT node, I am afraid only flow rules is not enough if you don't know the next hop mac address, e.g.
VM (192.168.1.1 -> 10.1.1.10) => OVS (192.168.1.1 snat to 10.1.1.1) => Server (10.1.1.1 -> 10.1.1.10)
In most situations, admin can't know (and should not know) the mac address of 10.1.1.10, and switches in traditional way always
learn this info by sending ARP request. But in OVS, I don't know if there is another way except for inserting a flow rule that has mac
addresses of 10.1.1.1 and 10.1.1.10 and using such actions as mod_dl_src and mod_dl_dst
What I am asking for is adding a layer 3 port, which has some ability similar with current tunnel port, and such layer 3 port can query
route cache which OVS maintained for tunnel, and neigh tables, w/o asking for kernel (especially it runs in DPDK context). Such layer 3 port
is not tunnel port so its behavior only relies on forwarding and modifying l2 headers
I've searched previous mails and there is indeed some work on layer 3 port, but such port doesn't have all I asked above. I am wondering if there
is a plan on this in future OVS roadmap, What you maintainer guys think about the requirement I proposed.
I am yearning for your advices, and maybe I can contribute to such things if you think it is worth of doing. Correct me if anything wrong, thank you.
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