Slow internet speed with VPN connected (Linksys wrv54g)

I have a VPN tunnel setup between two Linksys WRV54G routers. The connection using the VPN works fine and I am able to get my data the way I should be able to. The problem is a lot of the time my internet speed drops off to around 125K but then goes back up to 3megs a few minutes later then go back down. I know the problem is with the VPN b/c if I disable the VPN setting I have NO problems with internet speed at all. I have tried to change the MTUs and it defiantly has nothing to do with that, I have tried EVERY number you can think of.  I have just the VPN tunnel setup no VPN client.

These are my VPN Tunnel settings.

IPSec Pass-through: Enabled
PPTP Pass through: Enabled
L2TP pass-through: Disabled (also tried it enabled)
IP Range of Local secure group:
192.168.1.0~254
IP Range of Remote Secure Group:
192.168.2.0~254
Remote Secure Gateway : External IP address of other location
Encryption: 3DES
Authentication: MD5
Key Exchange Method: Auto (IKE)
PFS: Enabled:
Pre-Shared Key: (Matches other location)
Key Lifetime: 28000

Advanced VPN Tunnel Setup:
Phase 1:
Operation Mode: Main
Encryption: DES
Authentication: MD5
Group 768-bit
Lifetime Key: 3600

Phase 2:
Encryption: 3DES
Authentication: MD5
PFS: Enabled
Group 768-bit
Key lifetime: 28000
Anti-reply
Keep Alive
If IKE failed more than 5 times block for 60 s
TheTechEaseAsked:
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Rob WilliamsConnect With a Mentor Commented:
>>"Turns out there was a server on the other end with the same domain name"
I take it this server was not a member server of the SBS domain? That would cause a problem.
Thank you for updating TheTechEase.
Cheers !
--Rob
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Rob WilliamsCommented:
It is highly unlikely it would be in anyway related to your VPN tunnel options, as it would always be slow or fast.

It may be related to DNS. What do the clients point to for DNS. They really should point to the corporate DNS server only, but may be related to the problem. Perhaps next time it is slow try connecting to a site by IP rather than name. See if that is any faster. If so it's definitely DNS and you could then start to pursue that avenue.
Sample:  Google   http://64.233.187.99/
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TheTechEaseAuthor Commented:
Even if I disable the VPN tunnel for 2 weeks and during those weeks I have 100% internet speed of 3megs? Than the same day I enable the VPN tunnel the internet speed drops off again.

Clients on my end point to the router (192.168.1.1) and I have even tried (192.168.1.8) the server. The clients on the other end are all set to auto and there is no server there.

I am doing the speed test through www.speakeasy.net and it seems to be right on.


Thanks
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Rob WilliamsCommented:
Is there any chance a client on the "other end" is accessing the Internet through the VPN tunnel and your end, and downloading large files, using up your bandwidth?
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TheTechEaseAuthor Commented:
Nope VERY VERY small company.
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Rob WilliamsCommented:
Only thoughts I have are DNS which you could double check using http://64.233.187.99/ as a test next time it happens, and the excessive traffic from the other site. Could even be a Virus at the remote site causing the traffic.

Does LAN access slow down as well as Internet access?
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TheTechEaseAuthor Commented:
Tried using that website and it was still slow. That was right after I checked my speed through speakeasy.net. (Speed was 122k). I check my speed about 4 min later (Speed was 3megs) and it went backup and that website you gave it was normal speed again. Loaded much faster.

LAN speeds I don't think are any different when the internet speed is fast or slow.

Once again I only have the VPN tunnel setup no VPN client. That is fine correct?
Is there a website that will walk me through settings up a VPN Tunnel with Linksys? Maybe I am doing it wrong.
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Rob WilliamsCommented:
Sounds then like it's not a DNS issue.

>>"Once again I only have the VPN tunnel setup no VPN client. That is fine correct?"
That is fine, actually less chance of a problem the way you have it.

>>"Is there a website that will walk me through settings up a VPN Tunnel with Linksys? "
The one below is pretty good. It shows one end with a dynamic public IP and the other with a static, so you can compare. Best to have at least one end static.
http://linksys.custhelp.com/cgi-bin/linksys.cfg/php/enduser/std_adp.php?p_faqid=1705&p_created=1094687137&p_sid=U6Top31i&p_accessibility=0&p_lva=&p_sp=cF9zcmNoPTEmcF9zb3J0X2J5PSZwX2dyaWRzb3J0PSZwX3Jvd19jbnQ9MTAzJnBfcHJvZHM9MCZwX2NhdHM9JnBfcHY9JnBfY3Y9JnBfc
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TheTechEaseAuthor Commented:
Just something to add:

I ran the speed test about 5 times in a min. 3 out 5 times the started off SLOW then studdered to 3 megs. The other 2 times it went directly to 3 megs. Almost like somthing is preventing it somehow or someway.

BTE both routers firmware is up-to-date from Linksys
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Rob WilliamsCommented:
Afraid I am stumped. Keep in mind when accessing a site such as your speed test site it may choose a different route there each time, which can cause quite a variation in results but still it's odd that it speeds up during the connection.
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TheTechEaseAuthor Commented:
Turns out there was a server on the other end with the same domain name.  Caused everything to lock up when both were turned on.  We finally figured it out when SBS gave us a licensing error about 2 domain controllers.

Thanks to all that gave input!
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TheTechEaseAuthor Commented:
they were both SBS servers and since SBS only allows one SBS server on a domain as a DC, they were conflicting
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Rob WilliamsConnect With a Mentor Commented:
Ah, 2 x SBS is a no, no. <G>
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Rob WilliamsCommented:
Thanks TheTechEase. Where you solved the problem yourself you can ask to have your points refunded in the community support forum if you like.
--Rob
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