@Kevin_Z 

 

For question 1:

Here is the firewall management tab after the upgrade:

 

 

 

What is missing after the upgrade are the following two sections which used to be on this screen:

 

 

 

 

For number 2: 

There is no VPN server in the local network. The VPN server is on the internet.

The VPN client is on the laptop being blocked by the router ( I use the privateinternetaccess.com client)

 

For number 3:

Yes, rebooting the router clears the laptop IP address from the blocked hosts list. This only lasts until my VPN client tries to reconnect to a server and the laptop is blocked again.

 

Note: To be clear this is not about the VPN per se.  In order to establish what servers are available, the VPN client on the laptop uses ping packets. These ping packets are detected by the router as an ICMP flood attack and the laptop IP address is put into the Blocked DoS host list. 

With the old firmware I could turn off ICMP flood attack filtering using the settings that are now missing   shown above.

With the new firmware I cannot turn off this setting and now once more the laptop is being blocked and I can see in the system log on the router that it is still detecting flood attacks from this laptop and blocking it.

 

So, I want to go back to the old firmware that was working just fine for me in my configuration.

Please tell me how to downgrade to the old firmware.

 

Thanks,

Sean

@Kevin_Z  @Anyone 

 

Can anyone help me with the downgrade process for the C2300 please ?

 

@Kevin_Z 

 

Thank you. I am waiting for the engineer's email. At the time  of writing I have not received any email as yet.

@Kevin_Z 

 

Hi, I'm having exactly the same issue. Would your engineer be able to email me the solution too please?

 

Thanks

Did you find a solution in the end? I have the exact same issue.

@AlDaGr 

Hi there,
The engineer did send me a beta firmware which when applied with a local upgrade and rebooted it then allowed me to do another local upgrade and select the older firmware.
However before they had sent me that (because it took a couple of weeks) I had already figured out that you can use the procedure to restore the router as if the upgrade had been interrupted and select the old firmware when doing that. 
You have to force the router into recovery mode by holding the small reset button at the back of the router in with a paperclip or nib of a pen until the lights on the router start to flash indicating it is in recovery mode and then follow section 4.3 of the manual  :

 

NOTE: You will need to connect your PC or Laptop to the router via an ethernet cable to do this. 
You may also need to set a static IP on your pc/laptop address to make sure it can still connect to the router in recovery mode (I just can't remember if I had to do this or not) but the manual doesn't mention it.

Make sure you have downloaded the correct version of the old firmware for your router!!!

Both the method above and the beta firmware method worked for me.

Best of luck - I feel your pain and frustration.

Regards,

Sean
 

 

Thanks man, I'll have a go at that, good luck me! For anyone else stumbling across this thread: as a quick, non-permanent fix I've just worked out that you can edit (Inspect Element) the URL for "Firewall" in "Advanced -> Security" from "https://x.x.x.x/webpages/pages/userrpm/newSecuritySettings.xxxxxxxxxxxxx.html" to "https://x.x.x.x/webpages/pages/userrpm/securitySettings.xxxxxxxxxxxxx.html" and get the old DoS settings in there even with the newer firmware.

@AlDaGr 

Wow, your workaround is really cool!!!

I'll have to try that because I would still prefer to be on the most recent firmware!!!

Cheers.

Community helping each other!!