FreeBSD as multicast router

[Mike Karels]

> Hi All

> Still trying to run FreeBSD-box as multicast router :-)

> FreeBSD upgraded to 11.3-STABLE #1 r354778. netstat pacth by Mike Karels 
> manually applied and netstat -gs looks OK now.

> Latest pimd version 3.0beta1 downloaded from git and configured. While 
> configure it report following:

> =====
> ------------------ Summary ------------------
>   pimd version 3.0-beta1
>    Prefix................: /usr/local
>    Sysconfdir............: /usr/local/etc
>    Localstatedir.........: /usr/local/var
>    C Compiler............: cc -g -O2

> Optional features:
>    Kernel register encap.: no
>    Kernel (*,G) support..: no
>    Kernel MAX VIFs.......: 32
>    Memory save...........: no
>    RSRR (experimental)...: no
>    Exit on error.........: yes
> =====

> What does "Kernel (*,G) support..: no" means?


> Then my test multicast network configured (again)
>            --------------------          ----------
> -vlan298-| FreeBSD PIM router |-vlan299-| client |
>           |208.34/29   205.2/29|         |205.5/29|
>            --------------------          ----------


> Two multicast generated by FreeBSD-router: one (232.232.9.43) sended 
> from vlan299 and another (232.232.88.173) from vlan298 both with TTL=20

> Pimd started with following config:
> =====
> phyint vlan299 enable ttl-threshold 20
> phyint vlan298 enable ttl-threshold 20
> rp-address 10.200.205.2 232.232.0.0/16
> =====

If the threshold is 20 and the TTL is 20, does that mean that the TTL is
just high enough, or is it at the cutoff?  I'd try lowering the threshold
and/or increasing the TTL to see which it is.  If the TTL is 20 on the
incoming side, it would be 19 on the outgoing side.

> Now client is requesting multicast which router is sending from vlan299 
> and client successfully receiving it.  But when client is requests 
> multicast sending (by router) from vlan298 it doesn't receive it.


> My first question: (in theory) is router must send multicast to client 
> in this situation?

In theory yes, modulo TTL and other checks.

> And the second: why :Ttls is 1 at `netstat -f inet -g` output:
> =====

> IPv4 Virtual Interface Table
>   Vif   Thresh   Local-Address   Remote-Address    Pkts-In   Pkts-Out
>    0        20   10.200.205.2                            0      19247
>    1        20   10.200.208.34                           0      22249
>    2         1   10.200.205.2                            0      41496

> IPv4 Multicast Forwarding Table
>   Origin          Group             Packets In-Vif  Out-Vifs:Ttls
>   10.200.208.34   232.232.88.173      22249    1    2:1
>   10.200.205.2    232.232.9.43        19247    0    2:1
> =====


> Any suggestion?

> -- 
> CU,
> Victor Gamov

		Mike