Maximum Number of TCP Connections for Red Hat Linux 8.x

Could anyone tell me what the default for the maximum number of TCP connections
is for Red Hat Linux 8.x and how to change this value?

TIA

Detlef

DEngelbrechtBT schrieb:

> Could anyone tell me what the default for the maximum number of TCP
> connections is for Red Hat Linux 8.x and how to change this value?

That depends. Are you using iptables for routing and/or firewalling? If so,
then you might want to change the ip_conntrack values. Look at these
special files (just "cat" them -- values can be written with "echo"):

/proc/sys/net/ipv4/ip_conntrack_max
/proc/sys/net/ipv4/netfilter/ip_conntrack_max

Although, the default is somewhere arounde 32.000, I think. That should be
sufficient for most cases.

Arne

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> Could anyone tell me what the default for the maximum number of TCP
> connections
> is for Red Hat Linux 8.x and how to change this value?

~ 1024 per process.

Where this comes from is the number of file handles given per process which
is 1024. The first 3 are usually ate up by stdin, stdout, and stderr. The
rest will be split between file and socket handles.

To change it you have to rebuild your kernel. I can't remember the #define,
do a google and I'm sure you'll find it.

>> Could anyone tell me what the default for the maximum number of TCP
>> connections is for Red Hat Linux 8.x and how to change this value?
>
> That depends. Are you using iptables for routing and/or firewalling? If
> so,
> then you might want to change the ip_conntrack values. Look at these
> special files (just "cat" them -- values can be written with "echo"):

The OP didn't ask for how many connections can be tracked by iptables.

(E-Mail Removed) (DEngelbrechtBT) said:
>Could anyone tell me what the default for the maximum number of TCP connections
>is for Red Hat Linux 8.x and how to change this value?

For outbound sessions, also your /proc/sys/net/ipv4/local_port_range may
affect.
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