Hello, I see the following strange behavior on my ARM controller (here IP=x.100). After not communicating a for some time (guess half an hour or more) a request from the host (here IP=x.9) the controller reply is delayed for ca. 3 seconds and seems to cause a TCP re-transmission. After this the reply time of the controller is as usual. This delay and/or re-transmission may cause problems for some applications.
Seems like the lwip forgets the IP of the sender after a certain idle time, right? Is this a normal behaviour of lets say TCP? How can I get rid of this or control this? And yes, I'm still using lwip 1.4 for now. Thanks, Jochen 4159 17434.296389 192.168.0.9 192.168.0.100 ICMP 74 Echo (ping) request id=0x0001, seq=4480/32785, ttl=128 (reply in 4160) 4160 17434.296667 192.168.0.100 192.168.0.9 ICMP 74 Echo (ping) reply id=0x0001, seq=4480/32785, ttl=255 (request in 4159) (communication idle) 4161 26195.148858 192.168.0.9 192.168.0.100 TCP 66 52513 → 80 [SYN] Seq=0 Win=64240 Len=0 MSS=1460 WS=256 SACK_PERM=1 4162 26198.039871 de:bd:00:00:00:29 Broadcast ARP 60 Who has 192.168.0.9? Tell 192.168.0.100 4163 26198.039884 Dell_7a:2c:51 de:bd:00:00:00:29 ARP 42 192.168.0.9 is at 98:e7:43:7a:2c:51 4164 26198.148361 192.168.0.9 192.168.0.100 TCP 66 [TCP Retransmission] 52513 → 80 [SYN] Seq=0 Win=64240 Len=0 MSS=1460 WS=256 SACK_PERM=1 : -- Sent from: http://lwip.100.n7.nabble.com/lwip-users-f3.html _______________________________________________ lwip-users mailing list lwip-users@nongnu.org https://lists.nongnu.org/mailman/listinfo/lwip-users