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Full Discussion: How to force multicast packet to go via different interface?
Operating Systems Solaris How to force multicast packet to go via different interface? Post 303044352 by solaris_1977 on Thursday 20th of February 2020 02:32:33 AM
Old 02-20-2020
How to force multicast packet to go via different interface?
Hi folks,

I am working on a Solaris-10 global server, which is hosting 7 non-global zones. There are two kind of network interfaces on our servers, admin and prod. There is one route, which is going via admin interface, I want to delete that and have that from prod interface.
e1000g0 is admin interface
e1000g3 is prod interface
Code:
# ifconfig e1000g0
e1000g0: flags=1000843<UP,BROADCAST,RUNNING,MULTICAST,IPv4> mtu 1500 index 2
        inet 192.168.244.20 netmask ffffff80 broadcast 192.168.244.127
        ether 0:14:4f:78:f8:84
# ifconfig e1000g3
e1000g3: flags=1000843<UP,BROADCAST,RUNNING,MULTICAST,IPv4> mtu 1500 index 4
        inet 216.221.133.250 netmask ffffffc0 broadcast 216.221.133.255
        ether 0:14:4f:78:f8:87
#

If I check route of all zones, I see that multicast packets are going via e1000g0 (excep first one). I want it to go with prod interface e1000g3.
Code:
# for i in `cat /var/tmp/all_zones.out`; do zlogin $i netstat -nrv | grep 224.0.0.0; done
224.0.0.0            240.0.0.0       192.168.241.21       e1000g1:1  1500*    0   1 U        0      0
224.0.0.0            240.0.0.0       192.168.244.24       e1000g0:5  1500*    0   1 U        0      0
224.0.0.0            240.0.0.0       192.168.244.22       e1000g0:4  1500*    0   1 U        0      0
224.0.0.0            240.0.0.0       192.168.244.23       e1000g0:2  1500*    0   1 U        0      0
224.0.0.0            240.0.0.0       192.168.244.25       e1000g0:3  1500*    0   1 U        0      0
224.0.0.0            240.0.0.0       192.168.244.32       e1000g0:6  1500*    0   1 U        0      0
224.0.0.0            240.0.0.0       192.168.244.33       e1000g0:7  1500*    0   1 U        0      0
#

That means, I want to delete above routes and add route going via gw 216.221.133.193 and e1000g3. I am not sure, how to change this. I assumed that it is coming from static_routes file. I commented one line (see below) and rebooted server, still no luck.
Code:
# cat /etc/inet/static_routes
# File generated by route(1M) - do not edit.
default 192.168.241.1
-net 192.168.110.0/24 192.168.244.1
-net 192.168.201.0/24 192.168.244.1
-net 192.168.202.0/24 192.168.244.1
-net 192.168.246.64 -netmask 255.255.255.224 192.168.244.1
-net 172.16.0.0/16 192.168.244.1
10.0.0.0/8 192.168.244.1
192.168.64.0/22 192.168.244.1
192.168.78.0/24 192.168.244.1
192.168.69.0/24 192.168.244.1
net 192.168.244.0 -netmask 255.255.252.0 192.168.244.1
224.0.0.0/4 216.221.133.251 -ifp e1000g3:5
#224.0.0.0/4 192.168.244.20 -ifp e1000g0
host 192.168.244.22 216.221.133.193
#

Please suggest, how can it be done. Network team already enabled multicast for that VLAN. By suggestion on one of the forum, I changed index number of e1000g0 from 2 to 5 (e1000g3 is index 4)and then test, but seems like, this wrkaround doesn't work.
How I tested ? I took two sessions of zone-1. On one session I issued mcSend command
Code:
# mcSend -a 239.93.97.0 -p 9700 -t 6 
multicastIP: 239.93.97.0 
multicastIF: 0.0.0.0 
multicastPort: 9700 
TTL:  6 
loopback enabled: 0

On another session, I ran snoop command on e1000g0 and then e1000g3. It still doesn't show packets on e1000g3
Code:
# snoop -d e1000g3 -x0 host 239.93.97.0 
Using device e1000g3 (promiscuous mode) 
^C 
# 
# snoop -d e1000g0 -x0 host 239.93.97.0 
Using device e1000g0 (promiscuous mode) 
zone-1 -> 239.93.97.0  UDP D=9700 S=51392 LEN=136 
 
           0: 0100 5e5d 6100 0014 4f78 f884 0800 4500    ..^]a...Ox....E. 
          16: 009c 3153 0000 0611 0000 c0a8 f416 ef5d    ..1S...........] 
          32: 6100 c8c0 25e4 0088 05b7 4865 6c6c 6f2c    a...%.....Hello, 
          48: 2057 6f72 6c64 2100 0000 0000 0000 0000     World!......... 
          64: 0000 0000 0000 0000 0000 0000 0000 0000    ................ 
          80: 0000 0000 0000 0000 0000 0000 0000 0000    ................ 
          96: 0000 0000 0000 0000 0000 0000 0000 0000    ................ 
         112: 0000 0000 0000 0000 0000 0000 0000 0000    ................ 
         128: 0000 0000 0000 0000 0000 0000 0000 0000    ................ 
         144: 0000 0000 0000 0000 0000 0000 0000 0000    ................ 
         160: 0000 0000 0000 0000 0000                   .......... 
 
zone-1 -> 239.93.97.0  UDP D=9700 S=51392 LEN=136 
 
           0: 0100 5e5d 6100 0014 4f78 f884 0800 4500    ..^]a...Ox....E. 
          16: 009c 3154 0000 0611 0000 c0a8 f416 ef5d    ..1T...........] 
          32: 6100 c8c0 25e4 0088 05b7 4865 6c6c 6f2c    a...%.....Hello, 
          48: 2057 6f72 6c64 2100 0000 0000 0000 0000     World!......... 
          64: 0000 0000 0000 0000 0000 0000 0000 0000    ................ 
          80: 0000 0000 0000 0000 0000 0000 0000 0000    ................ 
          96: 0000 0000 0000 0000 0000 0000 0000 0000    ................ 
         112: 0000 0000 0000 0000 0000 0000 0000 0000    ................ 
         128: 0000 0000 0000 0000 0000 0000 0000 0000    ................ 
         144: 0000 0000 0000 0000 0000 0000 0000 0000    ................ 
         160: 0000 0000 0000 0000 0000                   .......... 
 
^C 
#

Thanks in advance.
Last edited by solaris_1977; 02-20-2020 at 03:47 AM..
 

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