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SubjectRe: Is there a MAX TCP/UDP CONNECTIONS limit in Kernel?
   From: Sven Koch <>
Date: Thu, 1 Nov 2001 19:37:31 +0100 (CET)

Outbound-connections are limited by the local portrange, changeable
in /proc/sys/net/ipv4/ip_local_port_range
(ran into this on one of my proxy servers, having thousands of connections
in the state CLOSING, TIME_WAIT and LAST_ACK - after
echo "1024 16383" >/proc/sys/net/ipv4/ip_local_port_range the box at
least stays working)

In current 2.4.14-preX, this is not true anymore. It is limited
by something approximating "local port range X number of unique
destination IP addresses" because if the remote address is unique
we allow multiple local port binds to occur on the same local port.

Franks a lot,
David S. Miller
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