ifconfig(8) vs. iproute

Discussion in 'Linux Networking' started by Ivan Shmakov, Feb 9, 2013.

  1. Ivan Shmakov

    Ivan Shmakov Guest

    [Cross-posting to and setting
    Followup-To: there.]
    ... Isn't ifconfig considered obsolete these days, in favor of
    the almighty ip(8)? And, FWIW, ip(8) doesn't seem to contain
    the word "alias." (And neither does its output; see below.)

    AIUI, initially, Linux (the kernel) allowed just one IPv4
    address per interface. Thus, the notion of "aliases" -- several
    "logical" network interface per single "physical" one -- was
    introduced. With the kernel's IP implementation extended to
    handle the case in an (arguably) better and more logical
    fashion, the very notion of an "interface alias" became
    obsolete. (And, as was already noted in this thread, these
    weren't "first-class" interfaces to begin with; for instance, I
    doubt that one'd use such an "alias" in the route(8) command.)

    $ ip addr list
    1: lo: <LOOPBACK,UP,LOWER_UP> mtu 16436 qdisc noqueue state UNKNOWN
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
    inet scope host lo
    inet6 ::1/128 scope host
    valid_lft forever preferred_lft forever
    2: eth5: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UNKNOWN qlen 1000
    link/ether f0:12:34:56:78:9a brd ff:ff:ff:ff:ff:ff
    inet brd scope global eth5
    inet6 2001:db8:1337::cafe/64 scope global
    valid_lft forever preferred_lft forever
    inet6 2001:db8:2001::da:42/64 scope global
    valid_lft forever preferred_lft forever

    Ivan Shmakov, Feb 9, 2013
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  2. Ivan Shmakov

    Jorgen Grahn Guest

    Some people claim it is. What it boils down to is whether the people
    who maintain ifconfig are dedicated to improve and extend it over
    time, or if they just keep it running.

    ip(8) /is/ IME more aligned with today's Linux networking support than
    ifconfig, route and the rest of net-tools (the name of the Debian
    package). A bit unfortunate -- almost everyone I know use the latter
    tools by habit, and so they miss out on features.

    Jorgen Grahn, Feb 9, 2013
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