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Which is the effective ephemeral port range in Linux 2.6 for this set up?

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Operating Systems Linux Red Hat Which is the effective ephemeral port range in Linux 2.6 for this set up?
# 1  
Old 02-17-2015
Which is the effective ephemeral port range in Linux 2.6 for this set up?
In my Linux system ephemeral port range is showing different ranges as follows

$ cat /proc/sys/net/ipv4/ip_local_port_range
32768 61000



cat /etc/sysctl.conf | grep net.ipv4.ip_local_port_range
net.ipv4.ip_local_port_range = 9000 65500

Which will be the effective ephemeral port range in my system?
# 2  
Old 02-17-2015
Assuming that you did not just change the value in /etc/sysctl.conf and have not rebooted, the range in /proc/sys/net/ipv4/ip_local_port_range applies.
This User Gave Thanks to fpmurphy For This Post:
steephen
# 3  
Old 02-17-2015
I set parameters in both way given in question . Moreover my startup script /etc/rc.local is taking care parameters of proc file system . So after I reboot what will be the effective range?
Last edited by steephen; 02-17-2015 at 08:59 PM..
# 4  
Old 02-17-2015
Should be the values in /etc/sysctl.conf
# 5  
Old 02-18-2015
sysctl -A | grep net.ipv4.ip_local_port_range

will give effective port range at any moment.

After reboot if we execute sysctl -p /etc/sysctl.conf system update kernel parameter net.ipv4.ip_local_port_range from /etc/sysctrl.conf file
# 6  
Old 02-19-2015
Quote:
Originally Posted by steephen
sysctl -A | grep net.ipv4.ip_local_port_range

will give effective port range at any moment.
Simpler to just use
Code:
cat /proc/sys/net/ipv4/ip_local_port_range

Quote:
After reboot if we execute sysctl -p /etc/sysctl.conf system update kernel parameter net.ipv4.ip_local_port_range from /etc/sysctrl.conf file
Unless you have modified the contents of /etc/sysctl.conf, this command should be unnecessary as the reboot causes /etc/sysctl.conf to be read. Also the default file is /etc/sysctl.conf, so sufficient to use
Code:
sysctl -p

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