I've noticed this as well in my logs. In linux/include/net/tcp.h,
TCP_DEBUG is turned on; in linux/net/ipv4/tcp_input.c,
tcp_ack_update_window() contains the following:
#ifdef TCP_DEBUG
printk(KERN_DEBUG "TCP: peer %u.%u.%u.%u:%u/%u shrinks window %u:%u:%u. Bad, what else
can I say?\n",
In two days I've got 46 messages like:
Mar 7 08:00:55 attila kernel: TCP: peer 163.162.41.4:37582/20 shrinks window
752789960:5840:752797200. Bad, what else can I say?
If needed I can ask about the os running there, I think it's solaris.
(nmap confirms: Solaris 7)
Linux attila 2.4.0-test11 #1
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