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11.7. Network Function Files
Red Hat Enterprise Linux makes use of several files that contain important common functions used to bring interfaces up and down. Rather than forcing each interface control file to contain these functions, they are grouped together in a few files that are called upon when necessary.
The
/etc/sysconfig/network-scripts/network-functions
file contains the most commonly used IPv4
functions, which are useful to many interface control scripts. These functions include contacting running programs that have requested information about changes in the status of an interface, setting host names, finding a gateway device, verifying whether or not a particular device is down, and adding a default route.
As the functions required for
IPv6
interfaces are different from IPv4
interfaces, a /etc/sysconfig/network-scripts/network-functions-ipv6
file exists specifically to hold this information. The functions in this file configure and delete static IPv6
routes, create and remove tunnels, add and remove IPv6
addresses to an interface, and test for the existence of an IPv6
address on an interface.