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Fibre MTU Value

Andrue
Pro
Posts: 775
Thanks: 90
Fixes: 1
Registered: ‎12-01-2015

Re: Fibre MTU Value

Quote from: roberto2212
I tryed set up mtu on ps4 manually 1400,1410.....1450,1460,1470,1480,1492,1500...no changes..still got error.So two weeks without ps4 online and plusnet ignore this problem.Im not suprised.
But PN have no reason to do anything. The fault does not lie in their network. From reading online most people think it's something Sony have done in an attempt to mitigate DDoS attacks. That they have configured their servers and network in a way that requires an unusual MTU configuration.
Put simply: Sony have slightly broken their PS4 network support. It's up to Sony to fix it. ISPs should not be expected to reconfigure their networks to support none-standard equipment. Nor should they be expected to provide technical support for products they don't sell.
Talk to Sony!
lukec
Dabbler
Posts: 11
Registered: ‎19-02-2016

Re: Fibre MTU Value

Nibiru
Do you know if PN use ATM or an IP DSLAMs (or even the Vendor) - The MTU of the "mux'ed" side may differ. 1500 standard ethernet
Do you know if the PN Service offering is ITU G993.1 or G993.2 ?
The "modem" is integrated in the PN Hub1
Capable yes and that's what roberto2212 is demonstrating, by using SG TCP Optimizer...
1488 looks to be the default on the PN Hub1, as to get a BTHub5 stable the default of 1500 needed to be changed to 1488 - stable since this afternoon
I can't find, nor can I obtain any useful info from PN Tech Support, on any "recommended settings" The answers so far have been, when you boil it down, "It's not our device - you're on your own..." Although much more politely than that precis I must say.

rgds
ejs
Aspiring Hero
Posts: 5,442
Thanks: 631
Fixes: 25
Registered: ‎10-06-2010

Re: Fibre MTU Value

FTTC uses G.993.2 (VDSL2). The BTWholesale WBC network has been designed to carry end user 1500 byte IP packets without fragmentation. There won't be any ATM anywhere in the network with FTTC.
roberto2212
Grafter
Posts: 109
Thanks: 1
Registered: ‎08-01-2016

Re: Fibre MTU Value

Already fixed by myself...highly not recommended use PN hub1
Ping www.google.co.uk
Pinging [212.56.71.123] with 1500 bytes -> ..fragmented
Pinging [212.56.71.123] with 750 bytes ->bytes=750 time=13ms TTL=59
Pinging [212.56.71.123] with 1125 bytes ->bytes=1125 time=13ms TTL=59
Pinging [212.56.71.123] with 1312 bytes ->bytes=1312 time=14ms TTL=59
Pinging [212.56.71.123] with 1406 bytes ->bytes=1406 time=13ms TTL=59
Pinging [212.56.71.123] with 1453 bytes ->bytes=1453 time=14ms TTL=59
Pinging [212.56.71.123] with 1476 bytes -> ..fragmented
Pinging [212.56.71.123] with 1464 bytes ->bytes=1464 time=13ms TTL=59
Pinging [212.56.71.123] with 1470 bytes ->Unknown error: 0
Pinging [212.56.71.123] with 1469 bytes -> ..fragmented
Pinging [212.56.71.123] with 1466 bytes -> ..fragmented
Pinging [212.56.71.123] with 1465 bytes -> ..fragmented
The largest possible non-fragmented packet is 1464  (1492 - 28 ICMP & IP headers).
You can set your MTU to 1492
PS4 without error in speedtest...maybe plusnet need made new firmware for hub1
Thanks guys for all reply on my problem.
lukec
Dabbler
Posts: 11
Registered: ‎19-02-2016

Re: Fibre MTU Value

@ejs
Thanks for the "FTTC uses G.993.2 (VDSL2). "  -  Need now to obtain a useful router to replace the PNHub1 which can't support Static IP blocks. The BTHH5 can and does but the devices are rebooted "randomly?" (CWMP requested) which hoses the config of the HH5. Oh and multiple auth requests getting "stuck - according to PN "tech support"
Any suggestions on useful routers that ignore OpenRG, CWMP reboot requests?
Oh and :-
"21CN and ATM
ATM is largely being replaced by Ethernet in 21CN. That said, there will still be traces of it since PPPoA (PPP over ATM) will still be used for handling DSL connections between end user premises and the MSAN in the exchange.
"
A very old statement and maybe it's all gone...;-)
rgds
Luke
ejs
Aspiring Hero
Posts: 5,442
Thanks: 631
Fixes: 25
Registered: ‎10-06-2010

Re: Fibre MTU Value

Yes, ADSL still uses ATM, but the VDSL2 in our FTTC uses PTM.
Any other router will not be affected by the CWMP rebooting, which is specific to the BT HomeHubs and the servers that remotely manage them. I don't know which devices specifically support static IP blocks, it sounds like you might want a business-grade router. Billion and Zyxel seem quite popular brands for VDSL2 modem-routers, maybe also DrayTek which are often used by businesses.
jafreer
Aspiring Pro
Posts: 858
Thanks: 41
Registered: ‎13-10-2012

Re: Fibre MTU Value

Can't say I have ever seen my HH5 randomly rebooting. I don't have a static IP so get issued a new one whenever there is a reconnect to Plusnet. Using the HH5, it runs for months and months with no reboots. My IP address remains the same. The HH5 does 'call home' every 24 hours but I have never seen a disconnect or reboot other than the one time it did a firmware update after having it about 8 months.
So I wouldn't be too concerned about random reboots, I have no evidence the HH5 does this.