IPod Touch - Some Apps can't connect

Question

This iPod Touch 4g is my first Apple product in over 15 years.
It connects flawlessly on my work network.  All apps function as advertised.  But on my home wireless router, it's a different story.
It seems to do just fine establishing a connection to my home wireless network.  But some apps work while others do not.  And some websites are reachable in Safari while others are not.
Things that work (kinda):
Mail (works about 60% of the time)
MyRadar (again, usually works, but seems inconsistent).
Safari can reach google.com, but that's about it.
Things that don't work (or work only rarely):
Weather
App Store
Safari cannot consistently reach any website other than Google.  Cannot connect to Apple.com.  My other wireless computers at home connect to these websites easily, so it appears to be a problem with the iTouch or how it's connecting to the router.
A possibly relevant clue:
My in-laws brought their MacBooks a few months ago, and I was unable to get them a consistent connection.  This was my first attempt at connecting Apple products to my network.  One MacBook wouldn't connect at all.  The other forever to connect, and then seemed very slow.
I was using a Belkin N router.  Thinking that may be the probem, I bought a Cisco 2500.  This has made little-to-no difference.  (Glad I went with the discounted factory refurbished version, because now I've got two routers with roughly the same capabilities.)
I tried moving the router further away from our wireless phone base unit (which uses 1.9 Ghz).  This made no difference.
I've reached the end of my knowledge and have stepped off into superstition and guessing.  Any help from knowledgable folk would be greatly appreciated.
Solved!
Go to Solution.

Answer 1

Try the following settings:
A] With the help of Cisco Connect Software (if at all you have installed the router with the help of this software)
          1] Open the software and go to the option which says "Router Settings"
          2] Then click on the option which says "Advanced Settings" which will take you to the router's configuration page.
         3] Lower the MTU (Maximum Transmission Unit) from 1500 to 1400 or less (usually found on your router's main/ basic setup page). Here is the link for determining and setting up the correct MTU size: http://www6.nohold.net/Cisco2/ukp.aspx?vw=1&docid=fbf8e8564632422eaa8ea80bf9dcba64_386.xml&pid=80&re...
          4] Then go to the Wireless tab, keep network mode as mixed,
For Channel Settings of 2.4 GHz you can make Channel Width to 20 MHz only and Channel to 6, 9, 11..
For Channel Settings of 5 GHz you can make Channel Width to 20 MHz only and Channel to 40 or 161...
B] If you haven't installed Cisco Connect then you can log on to the router's user interface using it's default IP address in the browser which is 192.168.1.1 and type in 'admin' as the password leaving the username field blank. This will take you to the router's web interface and then follow steps as mentioned above to make the changes.