If you can get 1496-byte packets all the way to the UE's IP through the EPC, then that shows (interestingly) that S1 traffic from EPC <-> eNB is somehow not beholden to the MTU as-reported on the S1 VLAN (or on the master interface for that matter), but that PDN traffic definitely is restricted by that 1496 MTU. I'm guessing that Telrad would need to release a software fix to increase the PDN VLAN MTU to 1500 or above to work around that problem.
That VPLS traffic seems to be constrained by the S1 VLAN MTU, even though L3 traffic isn't, is also interesting. It must have something to do with how VPLS is implemented on the EPC side...something is paying attention to that MTU value set on that VLAN in certain scenarios but not in others. Again, sounds like a software fix may be in order? What did Nick have to say when you talked to him on the phone? -- Nathan From: [email protected] [mailto:[email protected]] On Behalf Of Jeremy Austin Sent: Friday, November 04, 2016 5:56 PM To: [email protected] Subject: Re: [Telrad] Telrad Digest, Vol 25, Issue 1 Quick report on L2 experiments. I have VPLS working, with a few caveats, on both 7000s and 8000s. I still can't get a tunneled packet larger than (S1 interface - 74 bytes). For now, this is 1496-74=1422. UE management IP returns pings *up to 1496*, even with DNF. Oddly, if the UE WAN MTU is set higher than ~(S1-28)<=1468, the UE management IP *stops* responding up to 1496, and cuts off at 1460. I've successfully run PPOE from Mikrotik -> Mikrotik, with MRRU, inside the L2 tunnel. Not a huge amount of extra overhead. HOWEVER, I have completely failed to get a non-Mikrotik PPPoE client working over the tunnel. Packets leave the server (upstream) but don't actually reach the client downstream. Has anyone ever seen anything like this? For an L2 PDN, though, what is the mechanism for setting/knowing the actual MTU size? In this instance, we would like to be able to pass a full L2 1500 byte packet, if the functionality is there. -- Jeremy Austin (907) 895-2311 (907) 803-5422 [email protected]<mailto:[email protected]> Heritage NetWorks Whitestone Power & Communications Vertical Broadband, LLC Schedule a meeting: http://doodle.com/jermudgeon
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