We noticed that during a restore/backup from the master to a specific client, we have packets related to the vnetd port transmitted to ALL the clients in the same subnet. We have doupt that this is flooding the network causing packet drops. Could this be any netbackup master/client setting?
Example TCPDUMP from any client having NO backup restore in progress:
14:36:58.235193 IP (tos 0x0, ttl 64, id 4193, offset 0, flags [DF], proto 6, length: 1500) MASTER.SERVER.22263 > NBU.CLIENT.vnetd: . 38806400:38807848(1448) ack 1 win 46 <nop,nop,timestamp 1031455312 104386367>
14:36:58.235244 IP (tos 0x0, ttl 64, id 4194, offset 0, flags [DF], proto 6, length: 5844) MASTER.SERVER.22263 > NBU.CLIENT.vnetd: . 38807848:38813640(5792) ack 1 win 46 <nop,nop,timestamp 1031455312 104386367>
14:36:58.235289 IP (tos 0x0, ttl 64, id 4198, offset 0, flags [DF], proto 6, length: 4396) MASTER.SERVER.22263 > NBU.CLIENT.vnetd: . 38813640:38817984(4344) ack 1 win 46 <nop,nop,timestamp 1031455312 104386367>
14:36:58.235292 IP (tos 0x0, ttl 64, id 4201, offset 0, flags [DF], proto 6, length: 1500) MASTER.SERVER.22263 > NBU.CLIENT.vnetd: . 38817984:38819432(1448) ack 1 win 46 <nop,nop,timestamp 1031455312 104386367>
14:36:58.235337 IP (tos 0x0, ttl 64, id 4202, offset 0, flags [DF], proto 6, length: 4396) MASTER.SERVER.22263 > NBU.CLIENT.vnetd: . 38819432:38823776(4344) ack 1 win 46 <nop,nop,timestamp 1031455312 104386367>
14:36:58.235386 IP (tos 0x0, ttl 64, id 4205, offset 0, flags [DF], proto 6, length: 5844) MASTER.SERVER.22263 > NBU.CLIENT.vnetd: . 38823776:38829568(5792) ack 1 win 46 <nop,nop,timestamp 1031455312 104386367>
14:36:58.235433 IP (tos 0x0, ttl 64, id 4209, offset 0, flags [DF], proto 6, length: 2948) MASTER.SERVER.22263 > NBU.CLIENT.vnetd: . 38829568:38832464(2896) ack 1 win 46 <nop,nop,timestamp 1031455312 104386367>
14:36:58.235689 IP (tos 0x0, ttl 64, id 4211, offset 0, flags [DF], proto 6, length: 1500) MASTER.SERVER.22263 > NBU.CLIENT.vnetd: . 38832464:38833912(1448) ack 1 win 46 <nop,nop,timestamp 1031455313 104386367>
14:36:58.235739 IP (tos 0x0, ttl 64, id 4212, offset 0, flags [DF], proto 6, length: 5844) MASTER.SERVER.22263 > NBU.CLIENT.vnetd: . 38833912:38839704(5792) ack 1 win 46 <nop,nop,timestamp 1031455313 104386367>
14:36:58.235784 IP (tos 0x0, ttl 64, id 4216, offset 0, flags [DF], proto 6, length: 2948) MASTER.SERVER.22263 > NBU.CLIENT.vnetd: . 38839704:38842600(2896) ack 1 win 46 <nop,nop,timestamp 1031455313 104386367>
9555 packets captured
9619 packets received by filter
54 packets dropped by kernel
real 0m0.720s
user 0m0.109s
sys 0m0.138s