Question

Trying to create a VPN tunnel over Satellite Broadband

Asked by: GrahamRollerson

Hi All,

I have a colleague who lives and works from his home in the USA (Maryland) - the company is based in Oxford UK.

Becuase he is so remote the only internet service he can receive is an HughesNet Satellite service. This works fine for web browsing etc.

However when we try to connect him to the company VPN performance drops off to the tune of 75-80%. Now I know the reasons for this - its down to the VPN traffic being encrypted and the satellite system not being able to break in to the data streams to transmit them in its own way (this is from HughesNet). it seems the satellite BB systenm has ts own way of splitting packets, transmistting them and reassembling them at the other end.

HughesNet have a VPNservice but were talking 5 figures to get it up and running which for one guy is way too much.

I have two vpn systems in place at the moment - a legacy WIndows 2003 VPN (RRAS) and a new Juniper SA700 SSL VPN. the former is slightly better over the satellite then the Juniper but not by much

HughesNet have basically now stopped being helpful so I thought i'd throw it open to the Experts.

Does anyone have any suggestions as to how we can get this guy connected?

Very much look forward to hearing back from you all.

Graham

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Asked On
2008-04-08 at 01:52:18ID23303891
Tags

Microsoft

,

XP

,

sp2

,

VPN Access

,

Sonicwall/Juniper

,

SW = Pro2040 Juniper = SA700

,

VPNAccess

Topics

Satellite Internet

,

Virtual Private Networking (VPN)

,

IPSec Security Protocol

Participating Experts
1
Points
250
Comments
5

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Answers

 

by: ebjersPosted on 2008-04-08 at 10:19:04ID: 21307462

This is normal due to the way TCP works.  When your remote yuser connects to the VPN every time he sends a TCP packet to the server he has to wait for an ACK responce before the next one is sent and this can cause massive delays.

You can get around this by using UDP encapsulation.  I do not work with Sonicwall or Juniper so I am not sure how to do this using their components but it should be fairly easy.

The advantage of UDP over TCP is it will keep sending packets reguardless of ACK responces so your delay is cut.  You should see your 70 -80 % drop change to about 10 - 20%

eb

 

by: ebjersPosted on 2008-04-08 at 10:19:44ID: 21307471

This is normal due to the way TCP works.  When your remote yuser connects to the VPN every time he sends a TCP packet to the server he has to wait for an ACK responce before the next one is sent and this can cause massive delays.

You can get around this by using UDP encapsulation.  I do not work with Sonicwall or Juniper so I am not sure how to do this using their components but it should be fairly easy.

The advantage of UDP over TCP is it will keep sending packets reguardless of ACK responces so your delay is cut.  You should see your 70 -80 % drop change to about 10 - 20%

eb

 

by: ebjersPosted on 2008-04-08 at 10:19:54ID: 21307476

oops sorry for the double post...

 

by: GrahamRollersonPosted on 2008-04-15 at 05:22:45ID: 21357927

Hi EB

Thanks for the reply - sorry for takign so long to reply myself.

UDB is an interesting thought - I cant find any way of doing it though. But I guess i need to spend a little more time on this

Thanks again

 

by: ebjersPosted on 2008-04-15 at 06:53:52ID: 21358676

I don't know how to do it in RRAS, only on CISCO devices.  You need to look for NAT-Transversal and UDP Encapsulation

If you can get it working then you will see a speed increase.

eb

20120131-EE-VQP-002

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