Create a DNAT rule on Head office and try access the same aplication by WAN address from Branch office, and the application it works as expected. After using Wireshark on this server that hosting the web application I could some retransmission events (image attached) The WEB application when accessed by VPN stay loading Loading and freeze. If the rate is higher, the user experience of your service may be affected.We are having a stranger problem when accessing by VPN (IPSEC Site to Site) a web application. The retransmission rate of traffic from and to the Internet should not exceed 2%.

(4) the receiver discovering that data has been damaged during initial transmission.Ĭommon reasons for retransmissions include network congestion where packets are dropped (either a TCP segment is lost on its way to the destination, or the associated ACK is lost on the way back to the sender), tight router QoS rules that give preferential treatment to certain protocols, and TCP segments that arrive out of order at their destination, usually because the order of segments became mixed up on the way from sender to destination. (3) the receiver notifying the sender that expected data hasn’t been received, and (2) the sender discovering that transmission was unsuccessful (usually through out of band means), (1) the lack of an acknowledgement that data has been received within a reasonable time, There are four common reasons for packet retransmission: This actually happens all the time, and typically doesn't cause much of a problem: as the retransmission timer counts down, the packets are resent, and the network continues to run along. When an outbound segment is handed down to an IP and there's no acknowledgment for the data before TCP's automatic timer expires, the segment is retransmitted.

This usually shows up as slow application performance and/or packet loss to the user.

A few retransmissions are OK, excessive retransmissions are bad. – Displays all retransmissions in the capture.Packet loss can lead to duplicate ACKs, which leads to retransmissions. _segment – Indicates we’ve seen a gap in sequence numbers in the capture.

Tcp retransmission wireshark reason