check_1_1_sp_comms
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Check 1+1 SP Comms
Apr 2021
Introduction
The 1+1 SPs communicate with each other over the Management network using various ports, these are:
15771 for Mux comms 15772 for Simulcrypt 15778 for stat Mux
We can use tcpdump to monitor the traffic between the Muxes by specifying the relevant port.
tcpdump -i mngt port 15778 -Q out
This will show Stat Mux traffic (as in the stat mux control messages).
The active Mux will show something like below:
tcpdump -i eth0 port 15778 -Q out tcpdump: verbose output suppressed, use -v or -vv for full protocol decode listening on eth0, link-type EN10MB (Ethernet), capture size 262144 bytes 15:49:22.309719 IP sp01.15778 > 235.2.127.254.15778: UDP, length 61 15:49:22.851978 IP sp01.15778 > 235.2.127.254.15778: UDP, length 61 15:49:23.394021 IP sp01.15778 > 235.2.127.254.15778: UDP, length 61 15:49:23.936007 IP sp01.15778 > 235.2.127.254.15778: UDP, length 61 15:49:24.478037 IP sp01.15778 > 235.2.127.254.15778: UDP, length 61 15:49:25.019993 IP sp01.15778 > 235.2.127.254.15778: UDP, length 61 15:49:25.562039 IP sp01.15778 > 235.2.127.254.15778: UDP, length 61 15:49:26.104193 IP sp01.15778 > 235.2.127.254.15778: UDP, length 61 15:49:26.646276 IP sp01.15778 > 235.2.127.254.15778: UDP, length 61 15:49:27.188263 IP sp01.15778 > 235.2.127.254.15778: UDP, length 61
check_1_1_sp_comms.1617897314.txt.gz · Last modified: 2023/03/09 22:35 (external edit)