Linux Enable/Disable Protocols Programmatically

Question

I want to enable/disable IPv4/IPv6 in Linux programmatically using C. Is this possible? If yes, kindly please let me know how to do this and any reference to sample program would also be very helpful.

Are you sure to want to disable IP on localhost ?

Basile Starynkevitch
– Basile Starynkevitch

2013-10-10 12:47:42 +00:00
Commented Oct 10, 2013 at 12:47 — Basile Starynkevitch
– Basile Starynkevitch, Commented Oct 10, 2013 at 12:47

Community · Accepted Answer · 2017-04-13 12:36:24Z

2

See here: https://unix.stackexchange.com/questions/66574/how-can-i-disable-ipv6-in-custom-built-embedded-setup

Unfortunately, the _sysctl(2) system call API is deprecated, so you are left with writing to files in /proc/ directly (which is easy enough from C, just a little funny smelling):

The important bits seem to be writing a textual value of 1 (text, not int) to at least the first of these two files, and possibly both:

/proc/sys/net/ipv6/conf/all/disable_ipv6
/proc/sys/net/ipv6/conf/default/disable_ipv6

As for IPv4, it's less clear to me. Do you really need to disable IPv4 while leaving IPv6 running?

edited Apr 13, 2017 at 12:36

CommunityBot

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answered Oct 10, 2013 at 12:38

John Zwinck

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