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    netowrking question (MTU settings)

    This is a discussion on netowrking question (MTU settings) within the Technical discussion forums, part of the Broadband Technical Help category; lve had to change my setup a bit due to my old 4 month old NetGear (R6120) developing a wireless ...

    1. #1
      Auron's Avatar
      Auron is offline Sky User Member
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      netowrking question (MTU settings)

      lve had to change my setup a bit due to my old 4 month old NetGear (R6120) developing a wireless issue, this has now been replaced by a TP-Link AC1750 (Archer C7 v5), now l have everything set up and working but l wish to finally resolve the message l get on my PS4 which notes "router might not support ip packet fragmentation".

      from what lve read lm assuming its MTU related, both my sky router and my new wireless router have MTU set as 1500. l may possibly need to change it on my PS4, but l remember when l lowered it to 1400 my download speeds shot up to what they should be though its mainly recently that lve noticed above quoted text.


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    3. #2
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      Re: networking question (MTU settings)

      You can use the ping utility to check how your network responds to different packet sizes.
      The following is for Linux users, options may be different for Windows and Mac users.
      Code:
      seawright@delta:~$ ping -M do -s 1472 -c 2 www.skyuser.co.uk
      PING skyuser.co.uk (77.240.11.51) 1472(1500) bytes of data.
      1480 bytes from mars.skyuser.co.uk (77.240.11.51): icmp_seq=1 ttl=117 time=110 ms
      1480 bytes from mars.skyuser.co.uk (77.240.11.51): icmp_seq=2 ttl=117 time=132 ms
      
      --- skyuser.co.uk ping statistics ---
      2 packets transmitted, 2 received, 0% packet loss, time 1000ms
      rtt min/avg/max/mdev = 110.417/121.696/132.975/11.279 ms
      
      seawright@delta:~$ ping -M do -s 1473 -c 2 www.skyuser.co.uk
      PING skyuser.co.uk (77.240.11.51) 1473(1501) bytes of data.
      ping: local error: Message too long, mtu=1500
      ping: local error: Message too long, mtu=1500
      
      --- skyuser.co.uk ping statistics ---
      2 packets transmitted, 0 received, +2 errors, 100% packet loss, time 1031ms

    4. #3
      Auron's Avatar
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      Re: netowrking question (MTU settings)

      well it looks like its possible though a windows utility, just ran a test.. my modem and external router are both set to 1500 when running the test l get an error noting the packet needs to be fragmented but DF set. whereas if l use 1400 l get no errors.

    5. #4
      seawright's Avatar
      seawright is offline Sky User Member
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      Re: netowrking question (MTU settings)

      Try length 1472. If an error is reported reduce length by ten and retest. Repeat until no error is reported.

     

     

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