Thread: VM Business New VM Business service - 350Mb
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Old 12-03-2018, 17:05   #116
APS
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Re: New VM Business service - 350Mb

When I do this it fails as follows:

C:\Temp>ping -f -l 1472 bbc.co.uk

Pinging bbc.co.uk [151.101.64.81] with 1472 bytes of data:
Packet needs to be fragmented but DF set.
Packet needs to be fragmented but DF set.
Packet needs to be fragmented but DF set.
Packet needs to be fragmented but DF set.

Ping statistics for 151.101.64.81:
Packets: Sent = 4, Received = 0, Lost = 4 (100% loss),

After experimentation I can found that only if I set the packet size to 1272 or less does the ping work, e.g.

C:\Temp>ping -f -l 1272 bbc.co.uk

Pinging bbc.co.uk [151.101.0.81] with 1272 bytes of data:
Reply from 151.101.0.81: bytes=1272 time=27ms TTL=54
Reply from 151.101.0.81: bytes=1272 time=22ms TTL=54
Reply from 151.101.0.81: bytes=1272 time=23ms TTL=54
Reply from 151.101.0.81: bytes=1272 time=26ms TTL=54

Ping statistics for 151.101.0.81:
Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),
Approximate round trip times in milli-seconds:
Minimum = 22ms, Maximum = 27ms, Average = 24ms

I checked the MTU size on our router, which is set to 1460 and then on my PC, which reports:

C:\Temp>netsh interface ipv4 show subinterface

MTU MediaSenseState Bytes In Bytes Out Interface
------ --------------- --------- --------- -------------
4294967295 1 0 1243690 Loopback Pseudo-Interface 1
1300 1 14060178541 12688986132 Ethernet

So it seems the PC is already set to a relatively low value of 1300 (I am not sure why it may be some CISCO VPN software I run occasionally).

Interestingly since my last post the VirginMediaBusiness website is now accessible (and fast with no changes at our end). The tracert is still lengthy though.

I still cannot access the standard Virginmedia.com website.
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