Strange issue on LAN

carl_townshend · ‎06-18-2013

Hi all

I'm facing a strange issue on my LAN to a remote site over a layer 2 Ethernet link.

I have a server which shares files, the server runs Linux

If I download a file from the server from the local LAN it's fine.

However if I go to my remote site and do the same it goes from 10 secs to 5 mins to download a 75 mbit file.

However on the remote site if I then download a file from a pc which sits on the same switch and vlan of the server it's fine, the server runs windows.

Any ideas what this could be ?

On the sniffer there seems to be a lot of retransmissions between the 2 devices.

However, as the server is ok from the local LAN, and the remote LAN downloads from another pc ok I'm struggling to find what it could be?

Rick Morris · ‎06-18-2013

How are the two sites connected, MetroE, VPN, MPLS, etc...? What is the connection speed?

carl_townshend · ‎06-18-2013

They are connected via a Ethernet link, 100mbit routed over a vlan

Rick Morris · ‎06-18-2013

Sorry, you already stated that in the original post, "remote site over a layer 2 Ethernet link"

So am I to assume each site has their own VLAN - so each local site is a seperate VLAN?

Are you doing anything with VTP, or intervlan routing on a router? Basically trying to understand the IP flow now.

Rick Morris · ‎06-18-2013

Found another post:

https://supportforums.cisco.com/thread/2129910

This was discussing changes to the MTU, what is your MTU set at?

Here is another post:

https://supportforums.cisco.com/thread/2131109

And then found this too, for what it is worth:

http://www.cisco.com/en/US/tech/tk389/tk689/technologies_tech_note09186a00801f9eb3.shtml