A strange question

Three OP routes are connected using vpn through ipv6

Network situation:
a--b--c (a and c is offices, b is the headquarters )

(The ping mentioned below refers to 192.168.1.X:)

When vpn establishes a connection, b cannot communicate with a or C, but A/C can ping b, after a/c ping b, b can ping a, or c
(After a ping b, b can ping a, but still can’t ping c. The same goes for
After c ping b, b can ping c, but still can’t ping a,
That is, whoever pings b can ping whoever b)

However, after a period of no data exchange, the problem reappeared.

Please help, and what configuration do I need to provide?
I hope I can understand my question, thank you

It sounds like he is running 3 DHCP servers on the same subnet? Cut and paste your network configs to help others troubleshoot this issue.

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Which VPN is that?

Please run the following commands (copy-paste the whole block) and paste the output here, using the "Preformatted text </> " button:
Remember to redact passwords, MAC addresses and any public IP addresses you may have

ubus call system board; \
uci export network; uci export dhcp; uci export firewall; \
head -n -0 /etc/firewall.user; \
iptables-save -c; ip -4 addr ; ip -4 ro li tab all ; ip -4 ru

Also include the VPN configurations, if they are not in network.

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Thanks for your reply
Please refer here :

I think you should really try WireGuard: server + client + site-to-site.
It can solve the current issue and simplify the configuration by an order of magnitude.

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