It's not that. LTE was made for cellular. Ask any LTE vendor (other
than Telrad) about doing anything other than NAT and they will ask "why
would you want that?". Ask them about running MPLS through a CPE and
they'll think you're a lunatic. To them the CPE is a cell phone.
On 11/6/2015 8:35 AM, Eric Kuhnke wrote:
I guess nobody ever thought that an ISP might /ever/ want to deploy
MPLS-capable edge routers at a CPE? Considering the cost of the CPE
radios and the APs it's pretty weird they do not support a 1600 byte MTU.
Before anyone says "MPLS customers should be on their own PTP link if
they're such an important business", there are numerous use cases for
an MPLS customer router on smaller branch office size sites.
On Fri, Nov 6, 2015 at 4:50 AM, Patrick Leary
<[email protected] <mailto:[email protected]>> wrote:
Here you go folks. If this generates more questions, post them and
I’ll seek more answers:
Regarding the threads about MTU settings to run optimally, here is
an official response:
“In both WiMAX and LTE the UE is configured with an MTU setting of
1400. This will enforce either MSS clamping (TCP) , PMTUD (LAN
side) or worst case fragmentation. The only time MTU becomes an
issue is in bridge mode, in NAT mode the end user traffic will be
working with a reduced MTU + encapsulation headers (28 bytes) i.e.
GRE (WiMAX) GTP (LTE).
Presently the Telrad BreezeWAY EPC can support 1918 and the
eNodeB 1692.
Regarding Telrad LTE UEs, the CPE7000 is limited to 1490 and the
upcoming CPE8000 it will be 1560 (Patrick note: I cannot give an
exact timeline on the CPE8000 beyond an _expectation_ of end of Q1
2016, could be sooner);
When working in bridge mode you can reduce the MTU of the LAN
device or rely on the UE to fragment. Preventing fragmentation is
optimal and this can be achieved by limiting the MTU side on the
LAN device connected to the UE.”
Cheers,
Patrick Leary
Telrad
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