In reply to a post by zyborg47:

In reply to a post by Chrysalis:

adsl is already 1 month on wholesale. so nothing for ofcom to fix.

that doesnt mean all retail will do 1 month, but some do.

on vdsl none do 1 month due to the wholesale situation.

Then they need to sort out retail then, not saying all contracts should be a month, but no more than 12.

ofcom has the view retail sorts itself out.

In reply to a post by Chrysalis:

In reply to a post by qasdfdsaq:

What's all the fuss about over an additional 8 bytes of MTU? Do you really think you'll notice a 0.5% difference?

it can be worse then that some sites/routers dont handle the smaller mtu too well, so might get occasional hangs on pages and such.

I see tomato firmware shibby etc. allows to use 1500mtu on pppoe, as well as BT's homehubs. using jumbo frames to get round the 1500 packet size limit.

ok since BT decided to boot me of my PPP session last night losing my ip I did some maintenance on my broadband.

Installed latest shibby on router, it has cosmetic errors in the gui with the mtu but I can confirm 1500 mtu is now up and running on my pppoe service. Using a asus rt-n16 router, should also work on the more popular (on here) asus rt-n66 router also. If interest is shown I will make a new thread on what I did to get the mtu working.

Also power cycled my modem to up my speed a bit as I had some spare snrm.

In reply to a post by Chrysalis:

Installed latest shibby on router, it has cosmetic errors in the gui with the mtu but I can confirm 1500 mtu is now up and running on my pppoe service. Using a asus rt-n16 router, should also work on the more popular (on here) asus rt-n66 router also. If interest is shown I will make a new thread on what I did to get the mtu working.

Yes please, I have an RT-N66U and currently running Merlin's build, but it doesn't support 1500byte MTU with PPPoE.

ok this is a cutback version. I am quoting myself.

so as some may know using a homehub one can have a 1500 byte MTU on FTTC.

Sky is excluded on this as they dont use PPPoE.

Most other routers, especially in default states are limited to a 1492 byte MTU.

AAISP made some noise about this when they modified their firebrick devices to allow a 1500 byte MTU to be used, they did this by enabling baby jumbo frames and allowing the interface to have a MTU higher than 1500 so the overheads of pppoe do not eat into the 1500 bytes.

I also read on some other sites that the version of the ppp software used on tomato firmware's was patched to support higher mtu values, although people were having issues getting it to work due to the tomato code forcing lower mtu values (probably as dummy protection). The dev had posted he would remove this handholding of mtu but not much else was said.

So last night I flashed the latest shibby firmware on to my asus rt-n16. Which is v1.28. I am using the AIO version.

I configured the device whilst it was offline (pc online via 3G tethering), enabled jumbo frames on PC (not sure if this bit needed), enabled jumbo frames on the router, manually set the mtu to 1500 on the pppoe config page on the router and added mru 1500 mtu 1500 to the optoins field (not sure if this bit needed either). I manually set the eth0 and vlan2 interfaces to 1508 mtu's inside ssh on the router. (pppoe has 8bytes overhead).

Then I started up the ppp session and watched. The shibby gui reported 1492 bytes of mtu which wasnt good, but the router was still offline so I didnt immediatly click what was going on, eventually I decided and hoped it was a just a gui thing and recconected the router back to the wan cable.

The result was the gui still reports 1492 but this I now know is not real, inside the router the ppp interface has a 1500 byte mtu and the values I set on eth0 and vlan2 were not overuled by the scripts and vlan1 was also set to 1508 mtu. I tested on speedguide.net's analyzer and non fragemented pings (after I set pc to 1500 mtu) which confirms 1500 bytes is working over the internet.

In reply to a post by Chrysalis:

ok this is a cutback version. I am quoting myself.

Great, something to try when I'm on hols in a couple of weeks.

shibby firmware is Tomato Firmware 1.28.0000 MIPSR2-112 K26 USB AIO
so 112 build.

Also I tested on my 2nd pc, with mtu on default auto detect and that has 1500 bytes also.

I dont know if other variants of tomato such as toastman can do this, I believe merlin asuswrt cannot do this. I also suspect jumbo frames isnt needed on the pc, only on the router. But not tested this.

Hi Chrysalis,

Just for interest and as I'm using the same firmware on my RT-N66U I thought I'd give it a go.

My ISP is Plusnet and I got it working using your guide. Works very nicely. Thanks.

C:\Users\Tim>ping google.com -f -l 1472

Pinging google.com [173.194.66.113] with 1472 bytes of data:
Reply from 173.194.66.113: bytes=64 (sent 1472) time=16ms TTL=47
Reply from 173.194.66.113: bytes=64 (sent 1472) time=16ms TTL=47
Reply from 173.194.66.113: bytes=64 (sent 1472) time=17ms TTL=47
Reply from 173.194.66.113: bytes=64 (sent 1472) time=16ms TTL=47

Thanks
Tim

good to see

In reply to a post by jchamier:

Great, something to try when I'm on hols in a couple of weeks.

I found a tip on the SmallNetBuilder forum under the Merlin software for the RT-N66U, which was simply to telnet or SSH into the router and issue these commands:

ifconfig eth0 mtu 1508
ifconfig vlan2 mtu 1508
ifconfig ppp0 mtu 1500

which works!

a ping test before:

C:\>ping google.com -f -l 1472

Pinging google.com [173.194.41.68] with 1472 bytes of data:
Reply from 192.168.40.1: Packet needs to be fragmented but DF set.

and a ping test after

C:\>ping google.com -f -l 1472

Pinging google.com [173.194.41.68] with 1472 bytes of data:
Reply from 173.194.41.68: bytes=1472 time=20ms TTL=52
Reply from 173.194.41.68: bytes=1472 time=21ms TTL=52

Now just to see if I can put these commands in some startup script

ok so confirmed working on merlin, and you didnt need to reestablish ppp right?

the startup thing problem is they likely to execute before the network is up but merlin allows to set scripts to run when certian events happens if I am right you can add the script to run when the network is started, or better after the network is started.

Edited by Chrysalis (Sat 31-Aug-13 22:28:42)