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Standard User youngsyp
(member) Fri 04-Jul-14 10:33:38
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Xilo recommended MTU...


[link to this post]
 
Hi,

I got my order confirmation through from Xilo this morning and everything is as expected. Something caught my eye though, in that the recommend I set the modem up with an MTU of 1432. Whenever I've messed around with MTU in the past, with a view to maximising performance, I've never noted any difference from changing it from its usual default of 1492. My connection has always allowed the maximum transmission without loss/ failure to send/ receive.

I guess I'm intrigued as to the rationale behind Xilo's recommendation. So have any of you other Xilo users changed this? And if so, have you noted any differences in performance when using a more 'usual' setting of 1492?

Cheers,

Paul

ISP: Coms.... Soon to be Xilo
Service: Coms Complete DSL100
Exchange: SMYG
MSAN: Broadcom
Router: Billion BiPac 7800N
Attenuation:38.5dB - 40dB
SNRM: 3.4dB (manually set)
Current sync: 9786kbps
Standard User fredfox
(experienced) Fri 04-Jul-14 18:29:38
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Re: Xilo recommended MTU...


[re: youngsyp] [link to this post]
 
I was doubtful that 1432 was going to actually work when I switched, and as I suspected it broke all HTTPS sites, google, banking etc. so I went back to 1492.

Pipex
Nildram
UKFSN
Be *
Now -> Xilo / Uno (and BT)

Still no fibre frown
Standard User gmoorc
(committed) Fri 04-Jul-14 18:53:46
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Re: Xilo recommended MTU...


[re: youngsyp] [link to this post]
 
I've always run at 1432 without any issue.
Think when I did some testing ages ago that 1492 didn't cause any packet fragmentation so not sure why they recommend 1432?

xilo Fibre+ BQM


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Standard User uno
(knowledge is power) Fri 04-Jul-14 18:58:37
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Re: Xilo recommended MTU...


[re: youngsyp] [link to this post]
 
1432 is considered a safe value... but shouldn't break any sites as per a follow post has indicated (I suspect other issues there as we've never seen such thing happen before).

1492 on some TTB circuits just does not work due to the TTB network as a whole and the template sent is one for all (currently).

Matt

uno Broadband
t: 0800 520 0345
Official Maidenhead, Milton Keynes & Sheffield Speedtest.net Host
Standard User 4M2
(knowledge is power) Fri 04-Jul-14 19:57:29
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Re: Xilo recommended MTU...


[re: gmoorc] [link to this post]
 
Pinging [173.194.41.112] with 1500 bytes -> ..fragmented
Pinging [173.194.41.112] with 750 bytes ->bytes=750 time=36ms TTL=58
Pinging [173.194.41.112] with 1125 bytes ->bytes=1125 time=39ms TTL=58
Pinging [173.194.41.112] with 1312 bytes ->bytes=1312 time=41ms TTL=58
Pinging [173.194.41.112] with 1406 bytes ->bytes=1406 time=41ms TTL=58
Pinging [173.194.41.112] with 1453 bytes ->bytes=1453 time=43ms TTL=58
Pinging [173.194.41.112] with 1476 bytes -> ..fragmented
Pinging [173.194.41.112] with 1464 bytes ->bytes=1464 time=42ms TTL=58
Pinging [173.194.41.112] with 1470 bytes ->bytes=1470 time=42ms TTL=58
Pinging [173.194.41.112] with 1473 bytes -> ..fragmented
Pinging [173.194.41.112] with 1471 bytes ->bytes=1471 time=43ms TTL=58
Pinging [173.194.41.112] with 1472 bytes ->bytes=1472 time=43ms TTL=58
The largest possible non-fragmented packet is 1472 (1500 - 28 ICMP & IP headers).
You can set your MTU to 1500


On my uno TTB connection smile
Standard User bobble_bob
(fountain of knowledge) Fri 04-Jul-14 20:44:56
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Re: Xilo recommended MTU...


[re: youngsyp] [link to this post]
 
My router is set to 1458 and always has been (changed isp about 3 times).
Standard User parsimony
(regular) Sun 20-Jul-14 21:14:28
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Re: Xilo recommended MTU...


[re: youngsyp] [link to this post]
 
I read the email from Xilo to mean that 1492 was the preferred MTU?

Mine says "MTU: 1432 or 1492 (Recommended)"
Standard User Lazza
(fountain of knowledge) Mon 21-Jul-14 15:16:21
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Re: Xilo recommended MTU...


[re: parsimony] [link to this post]
 
In reply to a post by parsimony:
I read the email from Xilo to mean that 1492 was the preferred MTU?

Mine says "MTU: 1432 or 1492 (Recommended)"

As does mine also.

1492 is a pretty standard MTU setting so I'll continue to set mine as such once I go live on Wednesday. I know what Xilo say about 1432 but I've certainly never heard anyone other than them quote that figure as a safe setting. Hey-ho.
Standard User parsimony
(regular) Sat 02-Aug-14 22:03:35
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Re: Xilo recommended MTU...


[re: parsimony] [link to this post]
 
Went live with Xilo yesterday at 1492 and everything seems just fine.
Standard User uno
(knowledge is power) Sat 02-Aug-14 23:35:20
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Re: Xilo recommended MTU...


[re: Lazza] [link to this post]
 
Talk Talk do too wink

Matt

uno Broadband
t: 0800 520 0345
Official Maidenhead, Milton Keynes & Sheffield Speedtest.net Host
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