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Hi there,I am having an issue with FTP transfer and the implementation of ZBFW and that it takes several minutes before the transfer actually starts. Can be waiting up to 30+ minutes for the transfer to begin.Device is using FTP Active mode.Trying to...
I started to look more into the size of the packet and why it was so low. The switch is not sending the TCP option MSS in the TCP handshake so the default size of 536 is being used which is resulting in the sizes being so small. I went ahead and amen...
I can't imagine this would be down to the CPU utilisation as like I have mentioned, FTP works fine when the ZBFW has not been implemented or when the pass action is specified. Inside interface:ip tcp adjust-mss 1452 Outside/WAN interface:ip mtu 1492 ...
The inside interface already has the max segment size set -> 1452. Pings works to the ftp server while setting the site and df-bit tag. I can see in the packet capture the size of the packets were 594 bytes.
Further advancement today: I ran a packet capture on the router and could see that the issue seemed to be with the FTP Data connection (port 20) and not the FTP Connection (port 21). The client (switch) would send a [FIN, PSH, ACK] to the server and ...
