An office site customer feedback that when in L2TP VPN tunnel use SFTP to transfer files to the intranet, appear interruption situation.
after customers establish L2TP VPN tunnel, use secureFX tool (use SFTP protocol) transfer files to the intranet server, when the file is bigger than 10M can appear Virtual - Template1 interface UP and DOWN switching state, leading to the SFTP upload file failure. At the same using FTP upload test, fault phenomenon still exist.
Customer network state: use 2 FW to make VRRP, connect to core switch, configured with three VRRP groups which intranet interface has two VRRP group and extranet interface has one VRRP group. Public IP is virtual VRRP address.