Fedora 20 broadcast address

[James Hogarth]

On 20 November 2013 22:29, Louis Lagendijk <louis at fazant.net> wrote:

> On Wed, 2013-11-20 at 16:21 -0600, Kevin Martin wrote:
> > On 11/20/2013 03:21 PM, Louis Lagendijk wrote:
> > > Some time ago I asked a question about the broadcast address on Fedora
> > > 20. On my desktop (installed from one of Alpha TC's) the interface is
> > > brought up correctly, except that the broadcast address does not get
> set
> > > correctly:
> > > Ifconfig reports:
> > >
> > >> p5p1: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
> > >>         inet 192.168.159.186  netmask 255.255.255.0  broadcast 0.0.0.0
> > >>         inet6 2001:981:688d:f2:1e6f:65ff:fed5:7742  prefixlen 128
> > >> scopeid 0x0<global>
> > >>         inet6 fe80::1e6f:65ff:fed5:7742  prefixlen 64  scopeid
> > >> 0x20<link>
> > >>         ether 1c:6f:65:d5:77:42  txqueuelen 1000  (Ethernet)
> > >>         RX packets 568712  bytes 540500284 (515.4 MiB)
> > >>         RX errors 0  dropped 0  overruns 0  frame 0
> > >>         TX packets 359977  bytes 282238000 (269.1 MiB)
> > >>         TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0
> > >
> > > The broadcast address is not set when I use DHCP, but is also missing
> > > when I use static address allocation. When I try a
> > > ifdown p5p1; ifup05p1
> > > the broadcast address is setup correctly.
> > >
>

Interestingly enough using the iproute tools mirrors the net-tools here to
some extent... although net-tools reports 0.0.0.0 whereas iproute shows no
broadcast address:

 2: p4p1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state UP
group default qlen 1000
    link/ether d4:be:d9:7e:f3:ce brd ff:ff:ff:ff:ff:ff
    inet 10.81.10.110/24 scope global dynamic p4p1
       valid_lft 18508sec preferred_lft 18508sec
    inet6 fe80::d6be:d9ff:fe7e:f3ce/64 scope link
       valid_lft forever preferred_lft forever

No brd bit is included in this compared to another interface that does have
it:

12: virbr1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state
UP group default
    link/ether 52:54:00:72:fa:28 brd ff:ff:ff:ff:ff:ff
    inet 192.168.244.1/24 brd 192.168.244.255 scope global virbr1
       valid_lft forever preferred_lft forever

However I'm curious as to the consequences of this given that broadcast
address is just a function of network address against network mask anyway
...
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