Block all IPv6 Log Entries - please help me to suppress

jpvonhemel

So the only IPv6 I should be seeing in logs are clients are asking the router for a DCHP IPv6 address? Just trying to understand.

If that is the case, I should be able to narrow down clients with IPv6 turned on in the log, is this correct?

jpvonhemel

IPv6 Addresses in the firewall log do not seem to resolve nor gives an error unable to resolve. They do nothing. I am missing something.

jpvonhemel

I disabled IPv6 from command line for my two macs and one windows machine. I have a load of other LAN clients, cams, wemo, etc that I may not have access to for turning IPv6 off.

I am seeing the following in the log.

Cannot seem to embed screenshots from dropbox here, not sure why. Here is a URL

https://www.dropbox.com/s/4u9ggdx7hu8qihh/Screenshot%202016-05-23%2008.40.14.png?dl=0

I think these are happening between the Surfboard and the router, considering the WAN tag. None of the addresses resolve.

Thanks,

Jerold

johnpoz

Those are roots servers.. Your doing dns query too.

So you have resolver running, and pfsense clearly has an IPv6 address. What do you have setup on your wan interface?

Source: whois.arin.net
Name: B-GTLD-SERVERS-NET
Handle: NET6-2001-503-C27-1

And that source IP is comcast

Source: whois.arin.net
Name: COMCAST6NET

So yeah you are getting an IPv6 on your wan.. And pfsense is wanting to use that to resolve dns..

If you don't want ipv6 on your wan, then set that to none.

wannoipv6.png_thumb

jpvonhemel

My WAN IP is supplied by Comcast via DHCP.

WAN 1000baseT <full-duplex>67.190.xxx.xxx
2001:558:6040:6c:1c2d:xxxx:xxxx:xxxx

I turned IPv6 off in the WAN interface and now it only shows the IPv4 public IP.

I have All IPv6 traffic will be blocked by the firewall unless this box is checked CHECKED to get rid of the log messages I was receiving

So now if I turn IPv6 off on the various clients on my LAN, my SG-2440 should not see any requests in IPv6 form, correct?

Thanks for taking the time to help me!!</full-duplex>

johnpoz

Yup.. But as you mentioned it might be possible that there are some devices that continue to try ipv6 with no way to turn it off.. I personally wouldn't want such devices on my network that does not allow you to control such a basic thing.

But turning it off your clients should yes drastically reduce any ipv6 noise you see.

If your still seeing too much noise, there is nothing wrong with turning off the logging of default rules and creating your own rules to only log what you want. I for example don't log anything blocked at my wan other than tcp IPv4 syn traffic. I don't really care to see all the udp noise that is out there.

jpvonhemel

How would you recommend I resolve an IPv6 request in my log to a hardware client device? Clicking resolve didn't seem to help me to figure out where the request was coming from.

johnpoz

You would most likely need to track it down by mac.. Do a packet capture for the traffic, then find it via its mac address. You can look up the mac address to what hardware it is, ie the vendor that owns that mac range. Once you have the mac, if you have smart switch you can find it in your switches mac address table.

Or see what device has the Ipv4 with that same mac.

jpvonhemel

Thank you very much for helping a pfSense beginner! I've donated 10 dollars to FreeBSD Foundation as thanks!

johnpoz

That is fantastic.. Sure every little bit helps.. If you have any other questions, that is what we are here for..

paftdunk

I was going to start the same thread, but found this request. It seems like a perfectly reasonable option to at least offer to disable logging for the global IPv6 switch. Renewing that request.

johnpoz

"Renewing that request"

So you put in a feature request in redmine to disable just ipv6 default rule logging vs default rule logging all together?

imthenachoman

@johnpoz said in Block all IPv6 Log Entries - please help me to suppress:

Then turn of default rule logging

Can you help me with where this setting is? And what else will it suppress?

johnpoz

It would not log the default deny rules..

Its under the log settings.

imthenachoman

@johnpoz Where can I see the default deny/pass rules?

johnpoz

You don't see them in the gui, they are hidden rules. If there is not a rule that allows - then it is denied.

If you want to see the full list of rules.

https://docs.netgate.com/pfsense/en/latest/firewall/pf-ruleset.html

imthenachoman

@johnpoz Awesome. Thank you so much!