On 9.11.2022 12.39 PM, Barbaros Bilek wrote:
Hi again, I've added this route : ''route add 239.0.1.2/32 172.16.1.1'' But nothing changed. Is OpenBSD capable of multicast routing? Am I doing a wrong configuration? Any thoughts? Thanks in advance. On Tue, Nov 8, 2022 at 6:28 PM Barbaros Bilek <barbarosb...@gmail.com> wrote:Hi Folks, I try to do multicast routing with OpenBSD 7.2 Here is my setup: # Default GW to internet echo 'inet autoconf' > /etc/hostname.em0 # Get 10.10.12.81/24 from dhcp-server with gw 10.10.12.1 # Multicast Server Interface (transmit packets) echo 'inet 172.16.1.1 255.255.255.0 NONE' > /etc/hostname.em1 # Multicast Client interface (receive packets) echo 'inet 172.16.55.1 255.255.255.0 NONE' > /etc/hostname.em2 # Forward ip & multicast echo 'sysctl net.inet.ip.forwarding=1' > /etc/sysctl.conf echo 'sysctl net.inet.ip.mforwarding=1' >> /etc/sysctl.conf # Enable Multicast on OpenBSD rcctl enable multicast # Disable PF rcctl disable pf # Mrouted Configuration multicast_test# cat /etc/mrouted.conf name STD 239.0.0.0/16 pruning on phyint 172.16.1.1 threshold 16 boundary STD altnet 172.16.0.0/16 phyint 172.16.55.1 threshold 16 boundary STD altnet 172.16.0.0/16 phyint 10.10.12.81 disable # Enable mrouted on startUp rcctl enable mrouted # Reboot system reboot For testing purposes I use this application : Singlewire Software IC Test Multicast (It uses ) I'm sure about my testing environment. Because when I use a Brocade ICX L3 switch with router pim configuration everything is ok. But with OpenBSD multicast routing fails: Here some logs : multicast_test# mrinfo 127.0.0.1 (localhost) [version 3.8,prune,genid,mtrace]: 10.10.12.81 -> 0.0.0.0 (local) [1/1/disabled] 172.16.1.1 -> 0.0.0.0 (local) [1/16/querier/leaf] 172.16.55.1 -> 0.0.0.0 (local) [1/16/querier/leaf] multicast_test# netstat -g Virtual Interface Table Vif Thresh Local-Address Remote-Address Pkt_in Pkt_out 1 16 172.16.1.1 458 0 2 16 172.16.55.1 0 0 Multicast Forwarding Cache Hash Origin Mcastgroup Traffic In-Vif Out-Vifs/Forw-ttl 0 172.16.1.1 239.0.1.2 458B 1 Total no. of entries in cache: 1 IPv6 Multicast Interface Table is empty IPv6 Multicast Routing Table is empty Output when I run mrouted at debug mode : multicast_test# mrouted -dvvvv mrouted: debug level invalid debug level 2 18:06:55.405 mrouted version 3.8 18:06:55.407 Getting vifs from kernel interfaces 18:06:55.408 installing em0 (10.10.12.81 on subnet 10.10.12/24) as vif #0 - rate=0 18:06:55.408 installing em1 (172.16.1.1 on subnet 172.16.1/24) as vif #1 - rate=0 18:06:55.408 installing em2 (172.16.55.1 on subnet 172.16.55/24) as vif #2 - rate=0 18:06:55.408 Getting vifs from /etc/mrouted.conf 18:06:55.408 Installing vifs in mrouted... 18:06:55.408 vif #1, phyint 172.16.1.1 18:06:55.409 vif #2, phyint 172.16.55.1 pruning on 18:06:55.410 Installing vifs in kernel... 18:06:55.410 vif #1, phyint 172.16.1.1 18:06:55.410 vif #2, phyint 172.16.55.1 vifs_with_neighbors = 0 Virtual Interface Table Vif Name Local-Address M Thr Rate Flags 0 em0 10.10.12.81 subnet: 10.10.12/24 1 1 0 disabled 18:06:55.411 warning - SIOCGETVIFCNT fails 1 em1 172.16.1.1 subnet: 172.16.1/24 1 16 0 querier alternate subnets: 172.16/16 boundaries: 239.0/16 18:06:55.411 warning - SIOCGETVIFCNT fails 2 em2 172.16.55.1 subnet: 172.16.55/24 1 16 0 querier alternate subnets: 172.16/16 boundaries: 239.0/16 18:06:55.411 warning - SIOCGETVIFCNT fails Multicast Routing Table (3 entries) Origin-Subnet From-Gateway Metric Tmr In-Vif Out-Vifs 172.16.55/24 1 0 2 1* 172.16.1/24 1 0 1 2* 172.16/16 1 0 1 2* 18:07:15.583 update 0 starting at 3 of 3 18:07:16.593 update 0 starting at 3 of 3 18:07:17.602 update 0 starting at 3 of 3 18:07:18.612 update 0 starting at 3 of 3 When i watch packets on em1 i can see multicast packets are arriving: (constantly increasing...) multicast_test# tcpdump -nettti em1 host 239.0.1.2 tcpdump: listening on em1, link-type EN10MB Nov 08 18:19:33.344608 2c:f0:5d:73:f8:c4 01:00:5e:00:01:02 0800 73: 172.16.1.2.50665 > 239.0.1.2.20480: udp 31 Nov 08 18:19:34.358455 2c:f0:5d:73:f8:c4 01:00:5e:00:01:02 0800 73: 172.16.1.2.50665 > 239.0.1.2.20480: udp 31 But at the receiver side (em2) there are no multicast packets transmitted by em1 After a while i saw only one packet as igmp nreport with TTL 1 multicast_test# tcpdump -nettti em2 host 239.0.1.2 tcpdump: listening on em2, link-type EN10MB Nov 08 18:21:12.994258 2c:f0:5d:73:f8:c3 01:00:5e:00:01:02 0800 60: 172.16.55.2 > 239.0.1.2: igmp nreport 239.0.1.2 [ttl 1] I've even tried some igmp/mcast proxies but could not figure out how to become a multicast router with my best OS, OpenBSD. I can not understand what I am doing wrong. Thanks and regards.
Hi Barbaros, Those links below might help: https://troglobit.com/howtos/pimd-on-openbsd/ https://www.reddit.com/r/openbsd/comments/aw7vo7/64_simple_multicast_routing/ https://github.com/Esdenera/mcast-proxy http://undeadly.org/cgi?action=article;sid=20110222002946 Cheers, Tarkan
