SoftEther VPN User Forum

tcpdump -n -i br1 | grep 172\.31

11:44:46.395667 ARP, Request who-has 192.168.192.34 tell 172.31.49.254, length 28
11:44:46.779639 ARP, Request who-has 192.168.192.40 tell 172.31.49.254, length 28
11:44:49.340736 ARP, Request who-has 172.20.172.3 tell 172.31.1.251, length 28
11:44:49.952577 ARP, Request who-has 172.20.172.3 tell 172.31.49.254, length 28
11:44:51.104762 ARP, Request who-has 172.20.172.10 tell 172.31.49.254, length 28
11:44:51.216142 ARP, Request who-has 172.20.172.10 tell 172.31.1.251, length 28
11:44:51.489015 ARP, Request who-has 192.168.192.34 tell 172.31.49.254, length 28

arp -an | grep 172\.31

? (172.31.1.251) at 00:ae:00:fa:6d:92 [ether] on br1
? (172.31.149.165) at 00:ae:94:a4:73:ed [ether] on br1
? (172.31.49.254) at 00:ae:30:fd:0a:49 [ether] on br1
? (172.31.170.145) at 00:ae:a9:90:13:79 [ether] on br1
? (172.31.126.85) at 00:ae:7d:54:fe:c3 [ether] on br1

Restarting the vpnclient changes these IP-addresses.

This network does not have 172.31.0.0/16 subnet

How to turn off this behavior?

In certain network configurations (such as my case) softether cannot receive reply and continues to flooding the L2 segment with bogus ARP requests.

Server config option "NoArpPolling true" to disable this.