Red Hat LINUX 7.2 - OFFICIAL LINUX CUSTOMIZATION GUIDE Guida di Installazione Scaricare il pdf (Pagina 166)

166 Chapter 13. Network Scripts

13.3. Network Functions

Red Hat Linux makes use of several ﬁles that contain important functions that are used in various

ways to bring interfaces up and down. Rather than forcing each interface control ﬁle to contain the

same functions as another, these functions are grouped together in a few ﬁles that can be sourced when

needed.

The most common network functions ﬁle is network-functions, located in the

/etc/sysconfig/network-scripts/ directory. This ﬁle contains a variety of common IPv4

functions useful to many interface control scripts, such as contacting running programs that have

requested information about changes in an interface’s status, setting host names, ﬁnding a gateway

device, seeing if a particular device is down or not, and adding a default route.

As the functions required for IPv6 interfaces are different than IPv4 interfaces, a

network-functions-ipv6 ﬁle exists speciﬁcally to hold this information. IPv6 support must be

enabled in the kernel in order to communicate via that protocol. A function is present in this ﬁle that

checks for the presence of IPv6 support. Additionally, functions that 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 can also be found in this ﬁle.

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Red Hat LINUX 7.2 - OFFICIAL LINUX CUSTOMIZATION GUIDE Guida di Installazione Pagina 166