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network issues in last 1-2 months

  • 19 February 2023
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Good Day


Having some network issues.  Either something has changed on Koodo’s network, or its the change in my plan.


I’ve been tethering my laptop for years with  my koodo cell plan.  Firing up quick L2TP VPN tunnel to access a machine via RDP in emergencies when I don’t have access to wifi/lan internet.

Up until a few months ago, had 8 gig of data, with 1 to 4G of monthly usage…. Usage not more, unless my home internet went down over night while listing to podcasts while sleeping (I cap my cellular data to 1G above current usage to stop excessive “uncontrolled cellular data blow over” during local network internet outages).

After a Kodoo +$3 dollar/month extra 25 G of data kicked in, I’ve started to noticed some network issues with browsing on my cell phone, and massive network issues with tethering.
Issues:

 

  1. 30-100% ping loss from a android terminal session and windows CMD prompt
  2. Unable to connect to VPN most times, and when able to connect, is super flakey
  3. Web browsing on my PC works; but times out occasionally
  4. It seems to be worse in certain areas

It almost looks like there is intermittent network issues with traffic shaping is going on (HTTPS traffic having highest priority)

Anyone else noticing issues with their Koodo connection in the Ontario Hamilton/Toronto corridor?

 

Paul

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Best answer by NetworkWhatHappened 25 February 2023, 21:02

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It seems to be an network reception issue. If you are using an Android phone, can you try to download the app LTE discovery (or something similar) to find out with bands you were on? and the strength of it?

As well, can you do the normal speed test during the day and night to see if there was a difference? At night the signal reception could be worse because there were more partitions with closed door and windows.

Regarding the add-on 25GB, which plan were you on? Was it an “old” LTE plan where you can get speed of more than 100MBs? or was it a new one with a speed cap?

Hi 

Been using Koodo for over 12 years.    

Phone seems to run fine for most things except the for tethering/VPN/RDP

In the last 2 months its gone from usable, to completely un-usable.

I have read of issues with VPN over LTE due to the way data is sent in parallel over multiple channels 

Nothing physically has changed in my day to day usage and locations.  IE  On Friday I attempted to connect up at home, then multiple times on the way into Toronto (someone else was driving), and then at 2 different location, all with the same results. 

Running a S21ultra with the latest OS updates (Samsung's flavor of Android)

I haven’t checked speed in a while as it been doing what I need..  ie.. Remote desktop used very little data at about 150-200 Kbps for basic text functionality.

I seem to remember the speed was in the 60 Mbps range before;  so could of been on a old LTE plan before getting the 25GB add on (Only reason I got it was it was cheap and having the massive extra headroom for just in case :-)

I ran a speed test just now and hitting 281/17 Mbps and then again 324/6  (New LTE?) - Just blew gig of cellular testing :-(

Switch from LTE to  WCDMA/GSM (showing up as 4G) and speed test hitting 9/2 Mbps,  On 4G VPN connects up without any issues every time; but RDP still  very very spotty  (was able to connect once in about 10 time)

Generally my issue is more with VPN and general network through Tethering.   Pretty sure its something to do with the 25G plan addon 

Any thoughts on the possibly of Koodo switching me back to older cellular LTE? 

Thanks

Paul

 

 

Update

Done some more testing..

At this point in time, I’m pretty sure my issues is MTU related (Maybe Windows update related?)

The MTU of the VPN connection isn’t accurate, and is actually smaller.

 

Steps to fix

Connect up to Hotspot, and then bring up VPN

Run CMD prompt as Administrator

Check MTU settings

netsh interface ipv4 show subinterfaces

 MTU  MSS        Bytes In  Bytes Out  Interface
------  ---------------  ---------  ---------  -------------
  1500                1    5583429    2002832  Wi-Fi
  1400                1      23681      79493  VPN-Primary

VPN-Primary is 1400 max packet size

Perform ping tests (below) to figure out max MTU

Noted 1326 packet size is sweet spot where pings are replied to successfully.

Tweaked MTU for VPN-Primary connection

netsh interface ipv4 set subinterface "VPN-Primary" MTU=1326 store=persistent

Verify change caught.

netsh interface ipv4 show subinterfaces

 MTU  MSS        Bytes In  Bytes Out  Interface
------  ---------------  ---------  ---------  -------------
  1500                1    8203902    4478076  Wi-Fi
  1326                1     525672     526952  VPN-Primary

Connect up VPN - WORKS!

 

I’ll perform some testing in the different locations I work.  I think there may of been some other issues with the Koodo/Telus network  previously (as I wasn’t able to ping standard internet addresses as google.com) when was testing,

 

Hope this helps someone else out

Paul

 

-==-=--==--=-=Ping to get valid max Packet size


C:\>ping -f -l 1500 -n 1 192.168.2.30

Pinging 192.168.2.30 with 1500 bytes of data:
Packet needs to be fragmented but DF set.

Ping statistics for 192.168.2.30:
    Packets: Sent = 1, Received = 0, Lost = 1 (100% loss),

C:\>ping -f -l 1400 -n 1 192.168.2.30

Pinging 192.168.2.30 with 1400 bytes of data:
Packet needs to be fragmented but DF set.

Ping statistics for 192.168.2.30:
    Packets: Sent = 1, Received = 0, Lost = 1 (100% loss),

C:\>ping -f -l 1350 -n 1 192.168.2.30

Pinging 192.168.2.30 with 1350 bytes of data:
Request timed out.

Ping statistics for 192.168.2.30:
    Packets: Sent = 1, Received = 0, Lost = 1 (100% loss),

C:\>ping -f -l 1340 -n 1 192.168.2.30

Pinging 192.168.2.30 with 1340 bytes of data:
-Request timed out.

Ping statistics for 192.168.2.30:
    Packets: Sent = 1, Received = 0, Lost = 1 (100% loss),

C:\>ping -f -l 1330 -n 1 192.168.2.30

Pinging 192.168.2.30 with 1330 bytes of data:
Request timed out.

Ping statistics for 192.168.2.30:
    Packets: Sent = 1, Received = 0, Lost = 1 (100% loss),

C:\>ping -f -l 1320 -n 1 192.168.2.30

Pinging 192.168.2.30 with 1320 bytes of data:
Reply from 192.168.2.30: bytes=1320 time=55ms TTL=127

Ping statistics for 192.168.2.30:
    Packets: Sent = 1, Received = 1, Lost = 0 (0% loss),
Approximate round trip times in milli-seconds:
    Minimum = 55ms, Maximum = 55ms, Average = 55ms

C:\>ping -f -l 1325 -n 1 192.168.2.30

Pinging 192.168.2.30 with 1325 bytes of data:
Reply from 192.168.2.30: bytes=1325 time=51ms TTL=127

Ping statistics for 192.168.2.30:
    Packets: Sent = 1, Received = 1, Lost = 0 (0% loss),
Approximate round trip times in milli-seconds:
    Minimum = 51ms, Maximum = 51ms, Average = 51ms

C:\>ping -f -l 1326 -n 1 192.168.2.30

Pinging 192.168.2.30 with 1326 bytes of data:
Reply from 192.168.2.30: bytes=1326 time=52ms TTL=127

Ping statistics for 192.168.2.30:
    Packets: Sent = 1, Received = 1, Lost = 0 (0% loss),
Approximate round trip times in milli-seconds:
    Minimum = 52ms, Maximum = 52ms, Average = 52ms

C:\>ping -f -l 1327 -n 1 192.168.2.30

Pinging 192.168.2.30 with 1327 bytes of data:
Request timed out.

Ping statistics for 192.168.2.30:
    Packets: Sent = 1, Received = 0, Lost = 1 (100% loss),

C:\>ping -f -l 1326 -n 1 192.168.2.30

Pinging 192.168.2.30 with 1326 bytes of data:
Reply from 192.168.2.30: bytes=1326 time=50ms TTL=127

Ping statistics for 192.168.2.30:
    Packets: Sent = 1, Received = 1, Lost = 0 (0% loss),
Approximate round trip times in milli-seconds:
    Minimum = 50ms, Maximum = 50ms, Average = 50ms

Update - Solution didn’t last - Issue came back :-(

So above MTU solution was just a fluke.  

Called into Koodo 1st level support and went through the standard trouble shooting steps (reboot, reset network settings) without any luck.

Bumped up to level 2 support.

While waiting for 2nd level, repeated and new additional testing, swapping cell phones, sim cards and carriers. Problem followed Koodo service (the sim card)  ruling out phone.

2nd level support quickly got back to me.  After some additional testing, made some network changes on Koodo’s side and it worked

Believe it was a issue with some sort of Koodo network protection (but don’t quote me as I wasn’t paying to much attention)

 

So if your having issues with Tethering and VPN, use the Koodo online service to request a tech support call back

 

P.