Re: Recsync: RecCeiver Server announcement contains Broadcast address instead of server ip address

[Michael Davidsaver via Tech-talk <tech-talk at aps.anl.gov>]

On 4/22/22 11:51, Heinz Junkes via Tech-talk wrote:
> Hi,
>
> we need to route the announcements from our central Channelfinder server to a subnet so that the
> recasters on the IOCs in the subnet can send their PV information to the server.
>
> Unfortunately, the announcement package does not contain the IP of the server but FF:FF:FF:FF.
How are you planning to "route"?

Playing games with routing rules, or mangling via. something like iptables/netfilter won't change
the IP source address, which is what SERV ADDR == 0xffffffff means (as with CA or PVA).

If you are thinking to create an active repeater (application level proxy), then this app. will
need to copy the original IP source address into SERV ADDR field.

https://github.com/ChannelFinder/recsync#udp-protocol


> root@priscilla:~# socat -ls -u -v -x UDP4-RECVFROM:5049,broadcast,fork,bind=141.14.143.255 UDP4-SENDTO:10.0.1.255:5049,broadcast
> > 2022/04/22 17:22:18.879313  length=16 from=0 to=15
> 52 43 00 00 ff ff ff ff 84 81 00 00 61 bf c1 23  RC..........a..#
>
> Gruss Heinz