pfsense DNS resolver not registering IPv6 addresses

JKnott · Sep 19, 2019, 1:47 AM

@Peek said in pfsense DNS resolver not registering IPv6 addresses:

@JKnott. Winblows & Linux.

Okay ... so Linux basically "bridges" eth0 with the wifi interface when connected via eth0 by default.

Will try. Thanks.

No, it routes. Linux functions as a router, unless you disable it. I expect the same is true with the FreeBSD under pfSense and Macs. Also, when both interfaces are up, to the same network, it forwards the packets over the interface with the lowest metric. The metric is 100 for Ethernet and 600 for WiFi, so Ethernet gets used.

JKnott · Sep 19, 2019, 2:22 AM

@JKnott

Perhaps routing isn't the best term in this instance. Unlike Windows, Linux leaves both interfaces up, when Ethernet is connected. When an arp request comes in on the Ethernet port, for the WiFi address, Linux still responds, not caring which interface the address is assigned to and replies through the Ethernet port, based on it having the lower metric.

johnpoz · Sep 19, 2019, 2:46 AM

@JKnott said in pfsense DNS resolver not registering IPv6 addresses:

Linux functions as a router, unless you disable it.

Which linux distros are these, out of the box every single linux I have ever setup - unless its a specific "router" distro.
user@uc:~$ cat /proc/sys/net/ipv4/ip_forward
0

When you have 2 interfaces in the same network, yeah the OS should use the interface with the lowest metric to talk to that network.

JKnott · Sep 19, 2019, 2:52 AM

@johnpoz

Sorry, my mistake. I must have been thinking of something else. Regardless, with Linux both interfaces are up and either address can be used as I do frequently.

johnpoz · Sep 19, 2019, 2:55 AM

This is no different than windows.. I can fire up a wifi interface and use it, on the same network my wire is connected too.

JKnott · Sep 19, 2019, 2:56 AM

@johnpoz

On the same network? When I try that, I can't ping the WiFi interface, if Ethernet is connected. I haven't tried different networks. On my home network, I normally use WiFi for my notebook, but on occasion use Ethernet. Eitherway, I use the WiFi host name to connect to it.

Peek · Sep 19, 2019, 2:58 AM

Allrighty then ...

It's thus the WiFi address to be registered in DNS for connectivity via WiFi OR ETH.

johnpoz · Sep 19, 2019, 3:12 AM

Well depends on your box or driver - some bios can disable wifi on a wired connection.. But you can for sure fire it up and use it if you so desire.. But its almost never a good thing ;)

Wireless LAN adapter Wi-Fi:

   Connection-specific DNS Suffix  . : local.lan
   Description . . . . . . . . . . . : Broadcom 802.11n Network Adapter
   Physical Address. . . . . . . . . : 38-59-F9-5F-63-C1
   DHCP Enabled. . . . . . . . . . . : Yes
   Autoconfiguration Enabled . . . . : Yes
   IPv4 Address. . . . . . . . . . . : 192.168.9.212(Preferred)
   Subnet Mask . . . . . . . . . . . : 255.255.255.0
   Lease Obtained. . . . . . . . . . : Wednesday, September 18, 2019 10:10:33 PM
   Lease Expires . . . . . . . . . . : Sunday, September 22, 2019 10:10:32 PM
   Default Gateway . . . . . . . . . : 192.168.9.253
   DHCP Server . . . . . . . . . . . : 192.168.9.253
   DNS Servers . . . . . . . . . . . : 192.168.3.10
   NetBIOS over Tcpip. . . . . . . . : Enabled

Just fired wifi on same 192.168.9 network

Here is wire

Ethernet adapter Local:

   Connection-specific DNS Suffix  . :
   Description . . . . . . . . . . . : Realtek PCIe GbE Family Controller
   Physical Address. . . . . . . . . : 00-13-3B-2F-67-62
   DHCP Enabled. . . . . . . . . . . : No
   Autoconfiguration Enabled . . . . : Yes
   IPv4 Address. . . . . . . . . . . : 192.168.9.100(Preferred)
   Subnet Mask . . . . . . . . . . . : 255.255.255.0
   Default Gateway . . . . . . . . . : 192.168.9.253
   DNS Servers . . . . . . . . . . . : 192.168.3.10
   NetBIOS over Tcpip. . . . . . . . : Enabled

Here i am pinging the wifi IP from another box

user@uc:~$ ping 192.168.9.212
PING 192.168.9.212 (192.168.9.212) 56(84) bytes of data.
64 bytes from 192.168.9.212: icmp_seq=1 ttl=127 time=1.42 ms
64 bytes from 192.168.9.212: icmp_seq=2 ttl=127 time=1.26 ms
64 bytes from 192.168.9.212: icmp_seq=3 ttl=127 time=2.40 ms
64 bytes from 192.168.9.212: icmp_seq=4 ttl=127 time=4.29 ms
64 bytes from 192.168.9.212: icmp_seq=5 ttl=127 time=1.90 ms
64 bytes from 192.168.9.212: icmp_seq=6 ttl=127 time=2.94 ms
64 bytes from 192.168.9.212: icmp_seq=7 ttl=127 time=1.24 ms
64 bytes from 192.168.9.212: icmp_seq=8 ttl=127 time=1.34 ms
^C
--- 192.168.9.212 ping statistics ---
8 packets transmitted, 8 received, 0% packet loss, time 7010ms
rtt min/avg/max/mdev = 1.246/2.102/4.295/1.009 ms
user@uc:~$

JKnott · Sep 19, 2019, 4:54 PM

@johnpoz

Here's what happens here, with Ethernet connected:

Ping WiFi address

ping 172.16.0.40
PING 172.16.0.40 (172.16.0.40) 56(84) bytes of data.
From 172.16.0.10 icmp_seq=1 Destination Host Unreachable
From 172.16.0.10 icmp_seq=2 Destination Host Unreachable
From 172.16.0.10 icmp_seq=3 Destination Host Unreachable
^C
--- 172.16.0.40 ping statistics ---
5 packets transmitted, 0 received, +3 errors, 100% packet loss, time 4099ms
pipe 4

Ping Ethernet address

ping 172.16.0.40
PING 172.16.0.40 (172.16.0.40) 56(84) bytes of data.
From 172.16.0.10 icmp_seq=1 Destination Host Unreachable
From 172.16.0.10 icmp_seq=2 Destination Host Unreachable
From 172.16.0.10 icmp_seq=3 Destination Host Unreachable
^C
--- 172.16.0.40 ping statistics ---
5 packets transmitted, 0 received, +3 errors, 100% packet loss, time 4099ms
pipe 4

However, one thing I did notice was that the WiFi address is reachable for several seconds after plugging in the cable, then becomes unreachable.

If WiFi only is connected, I cannot reach the Ethernet address.

So, it appears Windows is shutting down the WiF interface, after Ethernet is connected. Ipconfig shows it as "Media disconnected".

johnpoz · Sep 20, 2019, 1:33 AM

Again that could be a setting in the bios or the driver, or the software you put on for the wifi card.. Is this a laptop? Its very common for laptops to do that..

Example

Here is my wifi card driver settings

Notice I have it disabled ;)

Again - because its not normally a good thing to be multihomed..

JKnott · Sep 20, 2019, 1:33 AM

@johnpoz said in pfsense DNS resolver not registering IPv6 addresses:

Notice I have it disabled ;)

My Wifi NIC doesn't have that setting.

johnpoz · Sep 20, 2019, 1:40 AM

What driver are you using - is it current, is it from the maker of the PC/Laptop or from the maker of the card.

What specific card is it, in your PC? What version of windows are you running? Pretty sure that should be available if the driver supports it in anything above windows 7.

Was the card part of the PC.. If so look in the bios. Or is it a laptop?

JKnott · Sep 20, 2019, 2:48 AM

@johnpoz

It's a Lenovo E520 ThinkPad. It's whatever driver comes with Windows 10, as I haven't installed any other. It originally came with Windows 7. I just took a quick look and didn't see any I could download.