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Hi list! I've been working with eCos for a month or so, and I really like it so far. Unfortunately, I'm having problems with TCP connections. I use eCos from cvs (checkout from december 2nd). I have the same problem in both of the following setups: 1) Linux synthetic target, FreeBSD TCP/IP stack 2) I386 PC target, I82559 NIC, OpenBSD TCP/IP stack I run the server_test.c test (not modified) on the target machine. On the client (a linux 2.4 machine) I run the following: $ while true; do echo a | netcat target 7734; done It works fine. The server sends a message like "Hello 10.0.0.2:31234", reads "a\n", and closes the connection. However, after some number of iterations the server stops responding. Then, after a while, it starts responding again. This has been tested in both setups. I have used tcpdump to try to figure out what goes wrong. I've attached a trace file. I used the synthetic target (10.0.0.3) and a linux host (10.0.0.2) when doing this trace. It seems that after 15 succesfull connections, the target does not respond to the 16th SYN packet. The client retries with an increasing delay, until it finally gets a SYN ACK reply. When running on i386 and using the OpenBSD stack I can connect 62 times before it stops responding. Otherwise, the behaviour is the same. I tried increasing the CYGPKG_NET_MEM_USAGE option with no effect. The target seems to still respond to icmp echo and arp requests while it refuses to answer TCP SYN. I have the same problem with my own applications. I have been unable to make this work smoothly in any configuration. Any suggestions to what is wrong? Could this be an eCos bug, or am I doing something stupid? :) Lars Kristensen
Attachment:
server_test.trace
Description: Binary data
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