xbox360 MTU and DNS errors

:::sigh::::

Been having problems for a long time with speed and stability with out internet connection. Over the last few months I've upgraded everything from my wifi hotspots to my router. After going through several comcast provided modems, a few weeks ago I finally
broke down and purchased my own. Speeds are no longer 30mbs, but a blistering 180mbs. The downside is both of the xbox 360 consoles in the house can no longer connect to xbox live. They fail at connecting the internet and give an MTU error.

I have spent several hours on the phone with support from Comcast, ****, Cisco, and XBox. Comcast blames the modem, because it isn't theirs, or they blame the router, because it isn't theirs. Most everyone else points to Comcast. I can hook my xbox up
to the wifi hotspot on my phone and it works fine. It's not the xbox. **** says there's nothing configurable from the consumer side and the modem just passes through data to the isp. Cisco says that the router is working fine.

I've adjusted every setting known to man. MTU size being the primary one. I've powercycled the modem, router, and xbox too many times to count. I tried plugging an xbox directly to the cable modem, taking the router completely out of the loop and still
get DNS and MTU errors. I've searched on google for hours and hours and am just coming up with nothing. I'm at my wits end. We can't play half our games because we can't connect to the internet. We can't use netflix or plex.

Does anyone have any ideas as to what it will take to get this fixed? Is there anything that I can tell a rep on the phone at comcast to try?

I'm so close to just cancelling my comast service. I'm sick of all the finger pointing and lack of technical abilities from the reps on the phone at comcast. The lack of customer service is starting to really tick off the most patient man in the world
here.

My config:

xbox360--> cisco RV325 --> **** surfboard 6183 --> comcast

:)

 

MTU Error

There's a known issue with Verizon and MTU, but that only started tonight (2/3/2012). One thing you might try is manual DNS under configure network. It usually solves MTU errors. Probably wouldn't be effective right now.

 

Random Disconnects and lagging out of Xbox Live Party Chat

Hiya Grenade,

Could you please try and run an Xbox LIVE Connection Test? Let us know the results of the test and if it displays any errors like MTU errors, DNS errors, NAT errors, etc. Please also reply with the answers to the questions in this sticky post (which also
explains how to do the Connection Test)

forums.xbox.com/.../155724.aspx

 

Level 1

AllAmbs

Posted 1 Mar 2016 9:49 AM

have you tried to reset your network configuration?

This link below shows you the steps to do it for an MTU error.

support.xbox.com/.../connection-error-solution

Also this link is for a DNS Error

support.xbox.com/.../connection-error-solution

if that doesn't work.....I suggest logging into your router and changing the settings thru the

this is the link to reset your arris surfboard 6183 thru the router arris.force.com/.../SB6183-Troubleshoot-Internet-Connection

and also you can do the same with comcast's router by going to
http://10.0.0.1

and using the default login if you didn't already create your own which is:

admin

password

if there are any other issue let me know and i'll be able to help you! also let me know if these aren't what you are looking for and i'll find another solution to your problem

 

wow so that post was a fail....

here we go again!

for DNS and MTU errors i do suggests reseting the network thru your xbox with

support.xbox.com/.../connection-error-solution

also i would go to Arris' website and follow their instructions for reseting your surfboard 6183 modem

arris.force.com/.../SB6183-Troubleshoot-Internet-Connection

i also have a link for connecting your arris to comcast internet connection

arris.force.com/.../Comcast-Cable-Modem-Activation

also you can log into your comcast router which i do a lot by using this link

http://10.0.0.1

and the default login is:

admin

password

hopefully this is what you are looking for and if not let me know especially if you receive an error code!

 

yeah, I've done all that ad-nauseum with the exception or resetting the modem back to factory default.. I'm willing to try, but confidence is at an all time low.

 

Hey Razor,

Let's try with a basic IP connectivity test (ping), along with a defined size for each sent ICMP echo, to determine if packet needs to be fragmented (when DF set).

Start with your current setup (RV325 --> 6183 --> Comcast) and if the outcome shows nothing unusual, exclude the RV325 from your setup and connect your computer directly to the Arris Surfboard 6183.

Windows: Open up a command prompt (press "Windowskey + R", then type "cmd" and press Enter).

 In the black window that opens, type: ping www.xbox.com -f -l 1364

Mac: Select spotlight and type Terminal. in the Terminal window, type: ping -D -s 1364 www.xbox.com



What to look for, or not what to look for, when you issue the previous stated command is: "packet needs to be fragmented but DF set".

I'm also a bit curious to why you use the Cisco RV325. Are you using this device to create a tunnel (VPN) between your home and your corporate network?

Post back with the result from this test.



 

No errors on pinging.. No fragmented packets.

Yes, I do connect with a VPN. I also connect in to home through a VPN when I am away as well as host several websites.

The XBox live connection worked previously with this router. The only change that was made was the cable modem.

 

What type of tunnel technique do you make use of?

 

just a standard ssl vpn.. has nothing to do with the xbox tho... right now the vpn is disabled while I troubleshoot the issue.