[pgpool-general: 7776] Virtual IP not reachable after if_up_cmd setup

[Nirav Bhatt]

Hello,

Inside my AWS cloud, I have following 3 servers

(all 3 can reach each other very fine using ping server1, ping server2,
ping server3 as well as IP address.):

10.192.10.10 server1
10.192.11.20 server2
10.192.12.30 server3

10.192.10.40 Virtual IP (I want this to be private, not elastic which is
public)

I was testing the following  if_up_cmd command on server1:

/usr/bin/sudo /sbin/ip addr add 10.192.10.40/32 dev ens5 label ens5:0

I could see new IP in the ifconfig result:

ens5: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 9001
        inet 10.192.10.10  netmask 255.255.255.0  broadcast 10.192.10.255
        inet6 fe80::4b0:29ff:fe38:3399  prefixlen 64  scopeid 0x20<link>
        ether 06:b0:29:38:33:99  txqueuelen 1000  (Ethernet)
        RX packets 67233  bytes 67464992 (67.4 MB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 22922  bytes 5116469 (5.1 MB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

ens5:1: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 9001
        inet 10.192.10.40  netmask 255.255.255.255  broadcast 10.192.10.255
        ether 06:b0:29:38:33:99  txqueuelen 1000  (Ethernet)

lo: flags=73<UP,LOOPBACK,RUNNING>  mtu 65536
        inet 127.0.0.1  netmask 255.0.0.0
        inet6 ::1  prefixlen 128  scopeid 0x10<host>
        loop  txqueuelen 1000  (Local Loopback)
        RX packets 39948  bytes 13976834 (13.9 MB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 39948  bytes 13976834 (13.9 MB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

However, after running the ip addr add, I can not ping the new elastic IP
10.192.10.40 from other servers. Only server1 has successful ping.

I tried running arping past the above, but that is also failing.

arping -U 10.192.10.40 -w 1 -I ens5:1

I tried adding and deleting several times, with different IP combinations
also to suit different AWS subnets, but no result. Server2 and server3
can't simply reach it.

My system is Ubuntu, the AMI is following, in case it helps:
ubuntu/images/hvm-ssd/ubuntu-focal-20.04-arm64-server-20211001

Thanks for the support!
-Nirav
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