| reply to Johkal
Re: [Speed] Does Comcast limit MTU? said by Johkal:If that doesn't do it, then I would focus on the the VPN software as tshirt  noted. Even though you aren't using the VPN now, it will dictate what global MTU is used. So - how do I find out if the VPN software is doing an over-ride?? |
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 JohkalCool CatPremium,MVM
join:2002-11-13
Happy Valley
kudos:5
 ·Comcast
 ·Comcast Digital ..
1 edit | I've never used VPN, but look for settings.
If possible, you can uninstall it, apply TCP settings, test and reinstall after if you want.
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Write me up a 125.......I Can't Drive 55 »redrocker.com/ »cabowabo.com/ |
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 tshirtPremium,MVM
join:2004-07-11
Snohomish, WA
kudos:3
·Comcast
| reply to Johkal
I believe Cisco VPN software hard sets the reduced MTU to allow for VPN header encryption.
This is set at 1415 to insure no fragmention even in the "worse case" (possible backdoor risk with fragmented VPN packets- was in a Cisco whitepaper a while back)
It will/may continue as long as the software is installed, even if it is never used. |
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| awesome.. said by tshirt: I believe Cisco VPN software hard sets the reduced MTU to allow for VPN header encryption. This is set at 1415 to insure no fragmention even in the "worse case" (possible backdoor risk with fragmented VPN packets- was in a Cisco whitepaper a while back) It will/may continue as long as the software is installed, even if it is never used. Awesome, thanks. I tried setting the VPN MTU to 1500 but no luck there either. I'll uninstall just to see what the deal is. Thanks for the help - both of you!!! |
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tshirtPremium,MVM
join:2004-07-11
Snohomish, WA
kudos:3 | reply to tshirt
Re: [Speed] Does Comcast limit MTU? »en.wikipedia.org/wiki/IPv6
IPv6 also adds header overhead (part of what Cisco software/hardware is allowing space for) |
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tshirtPremium,MVM
join:2004-07-11
Snohomish, WA
kudos:3 | reply to DrummerBoy52
Let us know how it turns out |
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