Forum Discussion

Aspirant

Jun 05, 2016

Solved

wndr4500v2 dropping comcast connection

i have motorola sb6141 cable modem. when pc is directly connected to the cable modem comcast functions well. when i connect to the internet thru my wndr4500v2 router with ipv6 set to WAN/dhcp LAN//...

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Firmware

Troubleshooting

frankc1
Jun 11, 2016
Hi ElaineM,

I have found a solution to this problem. My firewall (Bitdefender) has a default setting to deny incoming ICMP v6 messages. Setting this to allow made the problem vanish.

What I do not understand is why direct connecting the PC to the cable modem worked OK as Bitdefender was still in the loop. Magic I guess.

I believe allowing ICMP messages poses a security risk which seems to be an IPV6 risk. Do you have a comment on this?

Thanks again :-)

ElaineM

NETGEAR Employee Retired

Jun 07, 2016

One of our support team will follow-up with you for further diagnosis.

They'll be contacting you separately.

frankc1

Aspirant

Jun 11, 2016

Hi ElaineM,

I have found a solution to this problem. My firewall (Bitdefender) has a default setting to deny incoming ICMP v6 messages. Setting this to allow made the problem vanish.

What I do not understand is why direct connecting the PC to the cable modem worked OK as Bitdefender was still in the loop. Magic I guess.

I believe allowing ICMP messages poses a security risk which seems to be an IPV6 risk. Do you have a comment on this?

Thanks again :-)

ElaineM
NETGEAR Employee Retired
Jun 13, 2016
Perhaps, it's due to the firewall.

You can't have 2 firewalls running or you'll have problems.

Router has a firewall and you also have the bit defender. That's why when you bypass the router, it's working fine.