Re: Won't pass traffic in Wireless Service Providers http://www.dslreports.com/forum/r20445561 en Thu, 04 Dec 2008 17:36:30 EDT Thu, 04 Dec 2008 17:36:30 EDT Re: Won't pass traffic http://www.dslreports.com/forum/remark,20448712 hattmardy : I have also seen MTU issues where images and certain websites would not show up ... but wow 300, that's low! :)]]> http://www.dslreports.com/forum/remark,20448712 Wed, 07 May 2008 22:05:49 EDT Re: Won't pass traffic http://www.dslreports.com/forum/remark,20447708 LLigetfa : It depends on how the network is setup. 1492 is only common if you are doing PPPoE, 1500 otherwise. You should run MTU of 1500 where there is PPPoE packets tunneling through. 1492 only if the CPE is using PPPoE to your LNS. If the client router is doing the PPPoE, then the CPE should be 1500 and the client router should be 1492.

PMTUD usually works but needs ICMP and some overzealous admins will disable it. Also, Microsoft decided PMTUD is a security risk and may disable it too. In reality PMTUD is sometimes used as a DoS and is not a *real* security risk.
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Strange as it seems, no amount of learning can cure stupidity, and formal education positively fortifies it. -- Stephen Vizinczey]]> http://www.dslreports.com/forum/remark,20447708 Wed, 07 May 2008 18:54:33 EDT Re: Won't pass traffic http://www.dslreports.com/forum/remark,20447629 inova :
said by LLigetfa See Profile :

Often though MTU might be set higher and only some sites don't work.
I have come across this a couple times with government sites and changed the mtu at the cpe and the problem went away. Is this something that should be adjusted at my head end router to effect global changes? Or should all devices be set the same?]]> http://www.dslreports.com/forum/remark,20447629 Wed, 07 May 2008 18:37:28 EDT Re: Won't pass traffic http://www.dslreports.com/forum/remark,20447557 LLigetfa :
said by inova See Profile :

What made you think of it?
Ummm... well... it sounded like an MTU problem. :huh:

Often though MTU might be set higher and only some sites don't work.

Also, it depends on whether PMTUD is enabled in the OS and if the router supports it.
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Strange as it seems, no amount of learning can cure stupidity, and formal education positively fortifies it. -- Stephen Vizinczey]]> http://www.dslreports.com/forum/remark,20447557 Wed, 07 May 2008 18:24:30 EDT Re: Won't pass traffic http://www.dslreports.com/forum/remark,20447454 inova : Would you believe, uh, 300? Nice catch! I set it back to 1492 and bingo! I can't explain the mtu being set to 300. I had reset the cpe to factory defaults and loaded a basic config I use to start with. I don't mess with mtu settings, I leave them at default.

I am impressed LLigetfa. There is quite a bit of stuff comes up on a google search of "page cannot be displayed". In all of my reading I don't recall anyone suggesting mtu settings. What made you think of it?

Vista still sucks though...]]> http://www.dslreports.com/forum/remark,20447454 Wed, 07 May 2008 18:02:05 EDT Re: Won't pass traffic http://www.dslreports.com/forum/remark,20445754 LLigetfa : What are you running for MTU?]]> http://www.dslreports.com/forum/remark,20445754 Wed, 07 May 2008 13:13:50 EDT Re: Won't pass traffic http://www.dslreports.com/forum/remark,20445725 inova : By the way Matt, the APs I am referring to above are CB3s the clients are using behind the Delib CPEs. I don't believe this is a Delib issue. Just to clarify...]]> http://www.dslreports.com/forum/remark,20445725 Wed, 07 May 2008 13:09:33 EDT Re: Won't pass traffic http://www.dslreports.com/forum/remark,20445698 inova : Hey Matt, I have reinstalled everything readily available to test scenarios. Prior to reinstalling "ping www.google.com" was successful but in IE the page could not be displayed. In the past it has always been a vista issue. Swapping out the asus routers for dlinks solved the problem at the time. This is the first time I have encountered the problem with XP. ]]> http://www.dslreports.com/forum/remark,20445698 Wed, 07 May 2008 13:06:00 EDT Re: Won't pass traffic http://www.dslreports.com/forum/remark,20445561 hattmardy : Is it just HTTP traffic that won't work, or will no traffic pass the AP (can you ping to something on the other side of the AP)? If it is just HTTP, is it all HTTP traffic, or only some of it?]]> http://www.dslreports.com/forum/remark,20445561 Wed, 07 May 2008 12:39:59 EDT Re: Won't pass traffic http://www.dslreports.com/forum/remark,20445154 inova : Thanks for the help guys, no joy on the vista machine. wipe and reinstall. I haven't had a chance to try the fix for the xp machine. I have one client with this issue remaining. Her laptop works fine everywhere except one of their own internal APs. All other machines work fine with this AP. Weird. I found this blog: »www.reviewsaurus.com/aol-google-···splayed/ ,They cover a whack of problems that exibit the same symptoms.

Thanks again.]]> http://www.dslreports.com/forum/remark,20445154 Wed, 07 May 2008 11:29:57 EDT Re: Won't pass traffic http://www.dslreports.com/forum/remark,20439818 Jerm : netsh int ip reset resetlog.txt

That will reset the TCP/IP stack in Windows XP no additional software needed. Works like a charm. ]]> http://www.dslreports.com/forum/remark,20439818 Tue, 06 May 2008 12:58:38 EDT Re: Won't pass traffic http://www.dslreports.com/forum/remark,20438608 wizunwired : Carry this utility with you at all times.
»www.snapfiles.com/get/winsockxpfix.html

It repairs your winsock and gets your connectivity back up and running. I wouldn't feel to bad about the wipe and reinstall - I would be safe to bet that it got all of us the first time.]]> http://www.dslreports.com/forum/remark,20438608 Tue, 06 May 2008 08:29:12 EDT Re: Won't pass traffic http://www.dslreports.com/forum/remark,20438484 superdog : While what you are seeing is very, very odd, I would have tried to redo the TCP/IP stack. The other problem could be in the arp cache of the PC's, although a reboot should fix that issue?. :uhh:
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»www.wavecrazy.net Join WISPA today! »www.wispa.org/]]> http://www.dslreports.com/forum/remark,20438484 Tue, 06 May 2008 07:25:22 EDT Won't pass traffic http://www.dslreports.com/forum/remark,20437355 inova : This one has me beat guys, your help would be very much appreciated.

This client has 4 machines behind a Delib 2300 in wisp mode. All is working fine but this is a very old install with Tupperware on an external homemade antenna. As an upgrade we swapped the radio for a nice new poe Delib 2112. At the same time I wiped the hard drive on machine #1 and reinstalled XP(annual procedure) and it worked fine.

I checked the remaining machines for connectivity and they would not pass traffic. They all had the right ipconfig numbers numbers and "ping www.google.ca" answered successfully on all machines. None could bring up a web page.

I took machine #2 (xpsp2) home and it fired up and passed traffic fine. WTF. I wiped it and reinstalled xp and returned it and it worked fine.

Machine #3 is a HP media center PC with its own recovery partition. I ran the recovery and no go. I took it home to the shop and it passed traffic fine.!!?? I wiped the hard drive and reinstalled XP, returned it and it now works fine.

Machine #4 is a HP laptop with Vista. It connects wirelessly through a CB3. It behaves the same as the others except it will pass traffic when connected via wired network. I took the laptop and cb3 home to the shop and sure enough the wireless side functions fine.

I have another client with the same problem. Surely there has to be a simpler solution than wiping and reinstalling.
Any thoughts?]]> http://www.dslreports.com/forum/remark,20437355 Mon, 05 May 2008 22:42:25 EDT