broadcast of ifconfig on Linux

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2 total messages Started by Bin Zhou Mon, 16 Oct 2000 05:33

#696

Author: Bin Zhou
Date: Mon, 16 Oct 2000 05:33

16 lines
1790 bytes

hello there,

Im using Debian GUN/Linux 2.2--with 2.2.16 kernel. It seems to me that, the
/sbin/ifconfig command(version 1.39) performs strange. If I set all IP,MASK
and
broadcast values, everything go OK, but if I only set IP and MASK, not set
the
broadcast, the default broadcast is determinded by the class of the IP,
not the correct value(IP | ^MASK). ex. the broadcast of
172.31.0.1/255.255.255.0
is set to 172.31.255.255, not the 172.31.0.255. Is this the specification or
a bug?

thank you

zhoubin@no.spam.circle.to.no.spam

Re: broadcast of ifconfig on Linux

#697

Author: patrick Lottier
Date: Mon, 16 Oct 2000 00:00

27 lines
1797 bytes

You're on a class B network, so the default netmask is 255.255.0.0, and it's
logical: the default broadcast is based on the default netmask.
So, you *must* manually set broadcast if you want to use a sub-net.

patrick Lottier
System Administrator
plottier@qc-ns.com
http://www.qc-ns.com

Bin Zhou wrote:

> hello there,
>
> Im using Debian GUN/Linux 2.2--with 2.2.16 kernel. It seems to me that, the
> /sbin/ifconfig command(version 1.39) performs strange. If I set all IP,MASK
> and
> broadcast values, everything go OK, but if I only set IP and MASK, not set
> the
> broadcast, the default broadcast is determinded by the class of the IP,
> not the correct value(IP | ^MASK). ex. the broadcast of
> 172.31.0.1/255.255.255.0
> is set to 172.31.255.255, not the 172.31.0.255. Is this the specification or
> a bug?
>
> thank you
>
> zhoubin@no.spam.circle.to.no.spam

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