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Applications run slowly on IPSec tunnel

ZadokXerxes

I have configured a site to site VPN between my head office and branch office.

 

However, apps run very slowly at the branch office, when they are accessed from a drive at the Head office.

 

Microsoft Office is an example of this.

 

Can I get suggestions to speed this up, or are there particular configurations I need to make?



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    You possibly have packet fragmentation issues that's causing the slowness.

     

    I'd suggest reading up on Path MTU Discovery, verifying it's working in your environment and get it working if it isn't.

    Quickest way to check/verify MTU issues would be get a system at each site reconfigured to use an MTU of 1280 (low enough to account for most overheads incurred by VPN protocols and other encapsulation methods), then test throughput/latency between these two systems. Compare measurements between these two systems with the default MTU.

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  • 0

    You possibly have packet fragmentation issues that's causing the slowness.

     

    I'd suggest reading up on Path MTU Discovery, verifying it's working in your environment and get it working if it isn't.

    Quickest way to check/verify MTU issues would be get a system at each site reconfigured to use an MTU of 1280 (low enough to account for most overheads incurred by VPN protocols and other encapsulation methods), then test throughput/latency between these two systems. Compare measurements between these two systems with the default MTU.

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