> This only happened while downloading from the Internet. I happened to > be looking at the output of dmesg for some other reason, and it was full > of messages: > > hw tcp v4 cksum failed /usr/src/linux$ find . | xargs grep "hw tcp" ./net/ipv4/tcp_ipv4.c: printk(KERN_DEBUG "hw tcp v4 csum failed\n")); ./net/ipv6/tcp_ipv6.c: LIMIT_NETDEBUG(printk(KERN_DEBUG "hw tcp v6 csum failed\n")); So, this looks to be like from the heart of the networking code. Thus not likely to be a tcp code error. Much more likely a problem either with your network connection itself, your hardware or maybe the driver for your hardware.
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