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10.15.2007 at 02:17PM PDT, ID: 22894702
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7.2

Optimizing MTU for NFS

Asked by Paul-Brooks in Virtual Private Networking (VPN), Network Routers, Linux Networking

Tags: , ,

I have been configuring a site to site VPN using a cisco router (with the help of some experst on EE)

I now have the vpn tunnel functioning and stable, the networks are also routing fine. I have had to lower the MTU settings to get the data trasfer to work.

My quiestion is that is there a way of optimising this especially for NFS transfer? or is it more trial and error.

I have been changing MTU and MSS values and the trasfer does work, however it appears to stall and then retry, so the amount of data jumps in big blocks. It seems as if the retry time gets larger and larger untill it hangs completely.

We have found that at different MTU settings the data only writes the file header and hangs, other times it stops at 800k?

I can ping the down the VPN with packet sizes of upto 1472. I am using a cisco 878 on an SDSL line, to a Netgear router. We are copying from a Redhat server to a Ready NAS device.
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[+][-]10.15.2007 at 02:57PM PDT, ID: 20081826

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[+][-]10.15.2007 at 05:09PM PDT, ID: 20082344

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[+][-]10.16.2007 at 12:52AM PDT, ID: 20083745

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[+][-]10.16.2007 at 07:43AM PDT, ID: 20085961

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[+][-]10.16.2007 at 07:52AM PDT, ID: 20086048

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About this solution

Zones: Virtual Private Networking (VPN), Network Routers, Linux Networking
Tags: mtu, nfs, optimizing
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Solution Provided By: lausengdn
Participating Experts: 2
Solution Grade: B
 
 
 
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