> I am new to VPP and experimenting with it.
> I was able to get Reass/Frag working on regular Interfaces.
>
> The question i have is does Reassembly and Fragmentation supported on Tunnel
> interfaces(Both VXLAN/IPSec).
> If supported, is there any config knob i need to enable in addition to
> enabling feature on those interfaces.
>
> I am running V18.10. Any inputs will be of great help.
Firstly if you need fragmentation and reassembly you are probably doing
something wrong. ;-)
Fragmentation is done both for IPv4 and IPv6 in the rewrite node. For IPv6 it
is only done for locally originated. packets.
Somewhat depending on inner tunnel MTU and outer interface MTU, you can end up
with inner or outer fragmentation in the tunnel.
Full reassembly is enabled by default only for forus packets (destined to one
of VPP’s addresses).
It can be enabled in-path as well, but that’s probably not a good idea.
Virtual reassembly is integrated into NAT, MAP, and I’m working on generalising
that.
None of these are tunnel type specific. (Although some tunnels act as input
features, or have their own FIB DPO, bypassing the “forus” check).
Cheers,
Ole
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