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[d2d4j]

Hi burakkucat

Many thanks

Please could I ask what result speedguide.net shows for your mtu   

It should show mtu of 1492

Many thanks

John

[ejs]

Why should it show 1492? I have an MTU of 1500 (ADSL PPPoA) and speedguide.net shows the same.

[jaydub]

Hi

Thanks newtonstar, your mtu has been correctly given or 1461 should have passed

@ejs, good thought, but speedguide detects the mtu from the computer is run on, which normally matches the mtu of the router or 1500, but if router mtu is lower, this then causes a lower figure I believe

I would have to test this theory though, by setting a pc to 1024 and running speedguide test. If I have time tommorow I'll do the test

Many thanks

John

Can save you a job.  Router set to 1492.  Work laptop set to 1300 (no idea why!).  Speedguide reports an MTU of 1300 and the ping test supports this.

[ejs]

@ejs, good thought, but speedguide detects the mtu from the computer is run on, which normally matches the mtu of the router or 1500, but if router mtu is lower, this then causes a lower figure I believe

The speedguide.net website even says how it works - it reads the values in the TCP handshake packets. It calculates the MTU based on the TCP MSS value that arrives at the speedguide.net website. Of course your computer will specify an MSS value according to its MTU. Your router may well modify the TCP SYN packet as it passes through the router and write in a lower MSS value if the MSS is too large for the router's MTU.

[d2d4j]

Hi

@jaydub many thanks, much appreciated

@ejs many thanks, it has been many years since I read through speedguide, even though we are a test server for them in uk

I hope you don't mind, but if your mtu on router for pppoa is 1500, why did a packet fail at 1472, given your pc mtu is also 1500. Please accept my apologies if I have misread or not remembered correctly.

Many thanks

John

[d2d4j]

Hi

@ejs, sorry I think I misunderstood and you may be referring to burakkucat post/my reply where I said 1492. If so, his test passed on 1472, ohh sorry, mtu 1500 - old age sorry

Many thanks

John

[burakkucat]

Please could I ask what result speedguide.net shows for your mtu   

It should show mtu of 1492

This is what it shows --

Code: [Select]

« SpeedGuide.net TCP Analyzer Results »
Tested on: 2017.01.03 17:13
IP address: 88.105.xxx.xxx
Client OS/browser: Linux (Firefox 45.0)
 
TCP options string: 020405b40402080a01f25dbb0000000001030307
MSS: 1460
MTU: 1500
TCP Window: 14720 (NOT multiple of MSS)
RWIN Scaling: 7 bits (2^7=128)
Unscaled RWIN : 115
Recommended RWINs: 64240, 128480, 256960, 513920, 1027840
BDP limit (200ms): 589kbps (74KBytes/s)
BDP limit (500ms): 236kbps (29KBytes/s)
MTU Discovery: ON
TTL: 51
Timestamps: ON
SACKs: ON
IP ToS: 00000000 (0)

Never having used the SpeedGuide.net tools before, I hope I have selected the correct one! 

[d2d4j]

Hi burakkucat

Many thanks, much appreciated

Yes, it's correct thank you, and correctly shows your mtu at 1500, which is more then can be said for my maths skill

Many thanks

John

[burakkucat]

In all my devices' interfaces the MTU is set as Auto and it is only in the configuration of the VMG1312-B10D where I defined the MTU to be 1500 . . . because it allowed me to do so. 

[NewtronStar]

And for me it shows

Code: [Select]

« SpeedGuide.net TCP Analyzer Results »
Tested on: 2017.01.04 18:57
IP address: 90.255.xxx.xxx
Client OS/browser: Windows 10 (Internet Explorer 11.0)
 
TCP options string: 020405a80103xxxxxxxx
MSS: 1448
MTU: 1488
TCP Window: 262144 (NOT multiple of MSS)
RWIN Scaling: 3 bits (2^3=8)
Unscaled RWIN : 32768
Recommended RWINs: 63712, 127424, 254848, 509696, 1019392
BDP limit (200ms): 10486kbps (1311KBytes/s)
BDP limit (500ms): 4194kbps (524KBytes/s)
MTU Discovery: ON
TTL: 115
Timestamps: OFF
SACKs: ON
IP ToS: 00000000 (0)

And with Google Chrome

Code: [Select]

« SpeedGuide.net TCP Analyzer Results »
Tested on: 2017.01.04 19:19
IP address: 90.255.xxx.xxx
Client OS/browser: Windows 10 (Chrome 55.0.2883.87)
 
TCP options string: 020405a801030xxxxxxxxxx
MSS: 1448
MTU: 1488
TCP Window: 66560 (NOT multiple of MSS)
RWIN Scaling: 8 bits (2^8=256)
Unscaled RWIN : 260
Recommended RWINs: 63712, 127424, 254848, 509696, 1019392
BDP limit (200ms): 2662kbps (333KBytes/s)
BDP limit (500ms): 1065kbps (133KBytes/s)
MTU Discovery: ON
TTL: 115
Timestamps: OFF
SACKs: ON
IP ToS: 00000000 (0)


[roberto2212]

Well, contacted IDNET but unfortunately idnet not fixed mtu issue because they dont know how.So I canceled broadband and i switched to sky.Anyone knows if sky using pppoe vdsl or pppoa adsl?And also mtu for sky is default 1500 ? Thanks

[Dray]

Sky use DHCP/Mer on VDSL and PPPoA on ADSL

[roberto2212]

thanks, just looking how to setup hg612 modem to wrt1900acs ddwrt..so if I good understanding then hg612 must be on pppoa adsl ip bridged mode.correct?

[roberto2212]

Switched to sky..now on speedguide.net showed me correct mtu 1500..tested online gaming with no lag or delay..result : no recommended idnet ISP..thanks guys for all reply

[burakkucat]

Happy to know that you have now achieved a satisfactory solution.