richardberthao's profile

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Wed, Aug 4, 2021 1:17 PM

Firewall Blocked causing daily outages with Linksys router

I have issues since upgrading to Gigabit and getting new gateway Model:CGM4331COM .

I always get Firewall Blocked in logs and it blocks all internet access from my Linksys MR9600 router; which I use as primary connection for all devices. Very annoying and only started when I got new gateway a few months ago. Tech support has not been very helpful. I spent over an hour with one technician on the phone and he pushed a "fix" that bricked the router and I had to get a new one.

I am an IT professional of many years and know how to troubleshoot network issue. I even went so far as to build a network monitor device to track when connections drop (running NEMS on a Raspberry pi). The Internet drops on my Linksys router match the log entries in my Xfi Gateway:

FW.IPv6 FORWARD drop , 6896 Attempts, 2021/8/4 08:13:52 Firewall Blocked 
FW.IPv6 INPUT drop , 29453 Attempts, 2021/8/4 08:13:52 Firewall Blocked

I went in and turned off advanced security and disabled both IPv4 and IPv6 firewalls (I have a firewall on Linksys and run client based AV and anti-malware on my devices locally, so this is a non issue).

This is very frustrating because I am dropping Internet 1-2 times a day and the only fix is a hard reset of my Linksys router.

Responses

EG

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89.1K Messages

2 m ago

Do you have the Comcast gateway device in bridge mode ?

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11 Messages

@EG no I don't. I am on my third gateway device now. I tried bridge mode on both previous devices and once I switched over it killed all ports (I know port 1 is the only live port when in Bridge mode but it was dead also). So I am afraid to try bridge mode again because every time it "killed" all access to the router and I could not even locally connect to get back in to local admin console to turn off bridge mode. I would love it if I could get bridge mode to work because I think this will fix my issues. 

EG

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89.1K Messages

O/k being that you are an IT pro, I know that you are aware of the double NAT condition that you have when two routing devices are being cascaded. Just sayin'.

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I know, that is why I want to put in in bridge mode. I will try it again, hopeful this one will work

EG

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89.1K Messages

Be sure to power cycle it after you place it in to bridge mode. Good luck !

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EG

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89.1K Messages

FWIW, that's normal that you can't access the router component UI pages any longer. In bridge mode, it's just a straight cable modem / layer 2 bridge. The 192.168.100.1 address should still be able to access basic cable modem info such as the RF signal status like any other cable modem. I can't tell you why it's not working as a bridge, only that I've seen a large number of posts here lately indicating the same thing. Could be a firmware glitch.... If the 192.xxx address doesn't work, then you'll have to reset the device back to factory defaults in order to get the UI access back.

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