more google searching helped me to find this:

If your kernel has been compile with sur /proc filesystem support, you'll find
all parameters in
/proc/sys/network/ipv4
Just modifiy the value as needed. For example :
echo 120 > /proc/sys/net/ipv4/tcp_fin_timeout

I thought everything in /proc was dynamically set.  Will these values hold?


> 
> From: <[EMAIL PROTECTED]>
> Date: 2003/08/12 Tue AM 09:31:48 EDT
> To: [EMAIL PROTECTED]
> Subject: tuning redhat tcp
> 
> Trying to tune redhat advanced server 2.1 for weblogic.  Recommended parameters are:
> 
> /sbin/ifconfig lo mtu 1500
> kernel.msgmni 1024
> kernel.sem 1000 32000 32 512
> fs.file-max 65535
> kernel.shmmax 2147483648
> net.ipv4.tcp_max_syn_backlog 8192
> 
> These are added to /etc/sysctl.conf and a reboot makes them effective.  However, I 
> do not know an equivalent for tcp parameters set in solaris with ndd:
> 
> Setting TCP Parameters With the ndd Command
> 
> Set the following TCP-related tuning parameters using the ndd command, as 
> demonstrated in the following example:
> 
> ndd -set /dev/tcp tcp_conn_req_max_q 16384
>  
> /dev/tcp tcp_time_wait_interval 60000
> /dev/tcp tcp_conn_req_max_q 16384
> /dev/tcp tcp_conn_req_max_qo 16384
> /dev/tcp tcp_ip_abort_interval 60000
> /dev/tcp tcp_keepalive_interval 7200000
> /dev/tcp tcp_rexmit_interval_initial 4000
> /dev/tcp tcp_rexmit_interval_max 10000
> /dev/tcp tcp_rexmit_interval_min 3000
> /dev/tcp tcp_smallest_anon_port 32768
> /dev/tcp tcp_xmit_hiwat 131072
> /dev/tcp tcp_recv_hiwat 131072
> /dev/tcp tcp_naglim_def 1
> /dev/tcp tcpListenDrop 123865 
> 
> At run-time, if tcpListenDrop is non-zero and increasing, use the ndd command to 
> increase tcp_conn_req_max_q.
> 
> /dev/tcp tcpListenDropQ0 0 
> 
> If tcpListenDropQ0 is non-zero and increasing, use the ndd command to increase 
> tcp_conn_req_max_q0
>  
> /dev/ce instance 0
> /dev/ce rx_intr_time 32
> 
> 
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