Networking Latency Questions


Here is my scenario.

There are two branch offices in Germany and here Melbourne in Australia. People in Melbourne are going to connect to Citrix VDI in Germany. The latency from here to Germany is about 330ms which people experience some delays while browsing Internet. Bandwidth is sufficiently fast as they are on fiber (100Mb down/up).

Is there a way to improve this latency problem? I know we cannot change physics of distance but what service ISPs offer for this kind of case?
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andreasSystem AdminCommented:
round about 300-350 ms is very good average on connections from germany to australia.
Just tested from my employer (has own backbone net in germany) to several sites there (gov, edu and commercial)

Im afraid you cannot do very much to make this problem better if ALL connections need to be routed via VPN over germany.

You might thinking of setting up a local internet connection/firewall and only route internal traffic via VPN to germany.

if the cable lenght from au to germany is 20000km (thats round about the shortest path throgh red sea over singapore) then it makes a physical roundtrip time (if it were directly without hops and repeaters) of 130ms. The rest of the time is signal processing (repeaters in the glasfiber cables) and routing time.

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Tony JohncockLead Technical ArchitectCommented:
This document from Citrix gives you some pointers on what to do to handle latent links by tuning HDX/TCP parameters:
If I could give one additional suggestion. Set the traffic for the VDI at each end with a higher priority through your firewall and/or router.
I have no VDI setup so I can't help 100% but if you could explain why you are sending all traffic to Germany instead of just internal data and leaving WAN traffic to flow as normal?
i woudl have thought the AUS clients default router address would be that of the ISP router in AUS not GER
I guess I don't know how helpful this solution is for Citrix, but WAN accelerators might be able to make things appear faster. They can make use of content caching as well as compression so that even with 300ms latency more effective traffic can be pushed through making the end user experience seem like it has less delay. Cisco has WAAS, Riverbed is another top wan accelerator, I used to work at a company that used Expand Networks for WAN acceleration. I'm more family with the concept than with technical details of each vendor.
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