Bigpipe, Edgerouter Lite, MTU

Forums › Spark New Zealand (including Skinny and BigPipe) › Bigpipe, Edgerouter Lite, MTU

thewanderingv

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#196838 14-Jun-2016 20:01

Hi there,

Recently switched over to Bigpipe and seem to be struggling with slow connectivity, which I think may be related to my settings on the edgerouter lite.

Does anyone have a standard bigpipe ERL config to share? I know Michaelmurfy uses vlan tagging, but are there others that use the ERL without vlan tagging? What MTU settings do you use?

sbiddle

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#1571959 14-Jun-2016 20:57

MTU settings will need to be set to what the ISP supports - it's not a number you make up. In 99% of cases an ISP supports 1492 via PPPoA or PPPoE. Some ISP's support 1500. You'd need to check what BigPipe supports as it's maximum.

t0ny

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#1571997 14-Jun-2016 22:06

Shouldn't have to stuff around during with MTU. Basically upgrade the firmware if you haven't. Reset the configuration and follow instructions http://www.geekzone.co.nz/forums.asp?forumid=66&topicid=191757 to set up the ppoe interface.

michaelmurfy

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#1572043 15-Jun-2016 00:00

The correct MTU in BigPipes case is 1492 on the PPPoE interface, 1500 internally.

Michael Murphy | https://murfy.nz
Referral Links: Quic Broadband (use R122101E7CV7Q for free setup)

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thewanderingv

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#1574756 16-Jun-2016 01:22

michaelmurfy: The correct MTU in BigPipes case is 1492 on the PPPoE interface, 1500 internally.

Thanks - that makes sense - it seems to be working better now.

sorceror

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#1577611 21-Jun-2016 12:00

1) enable MSS clamping on the ERL if you haven't already

2) in the future, if you suspect an MTU issue, test by changing it on your PC. MTU is end-to-end and should be configured correctly on hosts (not routers, but that helps too).

thewanderingv

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#1577636 21-Jun-2016 12:57

Yes thanks - I've had TCP clamped at 1452, and it can make a difference to browsing speeds and downloads.

I'm still investigating the slow speed test results with Bigpipe, but the first set of results that I was looking into in this thread was related to my offloading settings rather than the clamping.