Changes in IPv6 between FreeBSD 12.2 and 13.0-BETA2

[Doug Hardie]

> On 14 February 2021, at 00:18, Doug Hardie <doug at sermon-archive.info> wrote:
> 
> Are there any changes in the IPv6 configuration?  I have multiple machines.  Some are still on 12.2 and one on 13.0.  I have configured both as described in the handbook for IPv6.  The 13.0 machine can ping the router just fine and the router shows in ndp:
> 
> Neighbor                             Linklayer Address  Netif Expire    S Flags
> fe80::120c:6bff:fee9:cdf7%bge0       10:0c:6b:e9:cd:f7   bge0 23h33m12s S 
> fee1::230                            68:5b:35:d3:4e:da   bge0 permanent R 
> fe80::6a5b:35ff:fed3:4eda%bge0       68:5b:35:d3:4e:da   bge0 permanent R 
> 
> The first entry is the router.  Its a real router, not a FreeBSD machine.
> 
> On the 12.2 systems I get from ndp:
> 
> Neighbor                             Linklayer Address  Netif Expire    S Flags
> fee1::250                            38:c9:86:07:3b:5b   bge0 permanent R 
> fe80::3ac9:86ff:fe07:3b5b%bge0       38:c9:86:07:3b:5b   bge0 permanent R 
> 
> The router doesn't show and ping6 of it's address yields:
> PING6(56=40+8+8 bytes) fe80::3ac9:86ff:fe07:3b5b%bge0 --> fe80::120c:6bff:fee9:cdf7%bge0
> 
> Nothing more for quite awhile.
> 
> I suspect there is a configuration item needed in 12.2 that is no longer needed for 13 but I haven't figured out what that would be.  I have confirmed that the 12.2 system is receiving the router advertisements.  They are just being ignored.
> 

Found the problem.  pf was blocking the advertisements.

-- Doug