I configured the VPN :
site 1 : router daytek 3900 is Head Office. IP WAN : A.A.A.A IP LAN 192.168.30.0/24
site 2 : router sophos XG31 is Branch Office. IP WAN B.B.B.B IP LAN 172.15.0.0/16
VPN connected and it isn't changed configuration, but sometimes it ping either well or not well.
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