DNS issues with E3000

[Draconius3k]

I've had this router for almost a year now. EVerything works fine. but at random intervals I seem to lose connection to my other computers/devices on the network. Internet works fine, but its as if file sharing has been disabled via the router.

All computers (3) (2 wireless, 1 wired), and an iphone 4 will stop seeing each other. I run upnp sofware on my laptop to control XBMC Media center to my tv via my laptop and the iphone controls that.

I've done all the troubleshooting I needed to do to ensure its the router itself. By rebooting the device all the computers work fine. 

I've also noticed that having devices join the network will cause issues too. They see the network ask to join, enter the WPA2-personal password in. and it wont hand out an IP address until I restart the router, and have them try to connect again.

The issue with this is that its random, but happens occasionally. It's running the latest firmware, which I decided to update it 5 days ago to 1.0.04 from 1.0.03.

Seems to be a problem with internal (LAN) DNS handouts our something. Anyone have insight on this or have come acrossed a similar issue? Thanks again.

[Corleone]

You mentioned in your post that you have upgraded the firmware with the latest one. After the successful process of upgrading the firmware did you reset the router? After successful firmware upgrade you need to reset the Router. It is recommended to reset the router once. Steps to reset the router:

Push the reset button on router for 30 seconds, turn off the router wait for 30 seconds and then power it on. Power light should blink when you perform the reset process.

After reset, reconfigure the router and then check the connectivity status...

[Draconius3k]

I'm a computer tech. I've reset it when I did the firmware upgrade from scratch. setup the settings manually. I'm still getting same issues with losing complete communication with the computers within the lan. The router is even on the same workgroup as well.

I've read some other posts on here. Seems to be just the stupid router E3000. after a powercycle/reboot from the admin panel everyone can see everyone again.

[Draconius3k]

Update: Also another thing I notice is the internet is very slow. When I restart the router  its back up to my full bandwidth.

[Corleone]

You can try the following combination of 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)

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 user name field blank. This will take you to the router's web interface and then follow steps as mentioned above to make the changes.

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...