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[lwip-users] lwip reply delayed after long communication idle time
From: |
Jochen Strohbeck |
Subject: |
[lwip-users] lwip reply delayed after long communication idle time |
Date: |
Wed, 1 Apr 2020 08:27:03 -0700 (MST) |
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] lwip reply delayed after long communication idle time,
Jochen Strohbeck <=
- Re: [lwip-users] lwip reply delayed after long communication idle time, Jochen Strohbeck, 2020/04/02
- Re: [lwip-users] lwip reply delayed after long communication idle time, address@hidden, 2020/04/02
- Re: [lwip-users] lwip reply delayed after long communication idle time, Jochen Strohbeck, 2020/04/03
- Re: [lwip-users] lwip reply delayed after long communication idle time, Jochen Strohbeck, 2020/04/04
- Re: [lwip-users] lwip reply delayed after long communication idle time, goldsimon, 2020/04/04
- Re: [lwip-users] lwip reply delayed after long communication idle time, Jochen Strohbeck, 2020/04/04
- Re: [lwip-users] lwip reply delayed after long communication idle time, Jochen Strohbeck, 2020/04/08
- Re: [lwip-users] lwip reply delayed after long communication idle time, Jochen Strohbeck, 2020/04/16
- Re: [lwip-users] lwip reply delayed after long communication idle time, Jochen Strohbeck, 2020/04/16
- Re: [lwip-users] lwip reply delayed after long communication idle time, Jochen Strohbeck, 2020/04/20