# Setup fastest Pseudowire-Protocol **URL:** \ **Category:** Installing and Using OpenWrt\ **Created:** [May 1, 2019, 4:30pm UTC](https://forum.openwrt.org/t/setup-fastest-pseudowire-protocol/36219 "2019-05-01T16:30:45Z")\ **Posts on this page:** 1\ **Showing post:** 2
**Author:** ![jeff](https://forum.openwrt.org/letter_avatar/jeff/32/5_5575768a8748004e209b776fc1b2916d.png) [@jeff](https://forum.openwrt.org/u/jeff)\ **Post date:** [May 1, 2019, 4:38pm UTC](https://forum.openwrt.org/t/setup-fastest-pseudowire-protocol/36219/2 "2019-05-01T16:38:56Z")
> [@riodoro](#): > > L2 tunneling [...] Encryption doesn't matter. GRE tunnel, layer 2 ("gretap") is perhaps the lightest weight from both CPU and bits -- but be careful with MTU as with any L2 tunnel that isn't actively fragmented by the endpoints. This is sort of a problem in general, as it is the encapsulated packets that get fragmented, so that the fragmentation-required messages go to the tunnel endpoint, not the sender of the encapsulated packet, as I remember the conundrum. One article on various flavors of tunnels under OpenWrt that I found helpful was [https://justus.berlin/2016/02/performance-of-tunneling-methods-in-openwrt/](https://justus.berlin/2016/02/performance-of-tunneling-methods-in-openwrt/) _Edit: Here's some earlier notes of mine on the MTU problem_ > [@\[SOLVED\] Gretap Tunnel and MTU-Size Problem](https://forum.openwrt.org/t/solved-gretap-tunnel-and-mtu-size-problem/14182/8): > > If you're routing the packets through the OpenWRT devices, then the ingress interface, running at Level 3, should be able to send back the ICMP message. Given that you've got the problem you describe, it sounds like they are bridging the networks at Level 2. This is a "common" problem with encapsulated Layer 2 bridging that I haven't seen a good solution for. I stopped looking once I was able to get the MTU on my 802.11 link up. Some interesting references include [http://blog.systemathic.ch/2…](http://blog.systemathic.ch/2015/03/05/openstack-mtu-pitfalls-with-tunnels/) --- _[View the full topic](https://forum.openwrt.org/t/setup-fastest-pseudowire-protocol/36219)._