conf/130776: ip addresses like 10.1.1.1 with subnet mask 255.0.0.0 makes the box unreachable

[Remko Lodder]

The following reply was made to PR conf/130776; it has been noted by GNATS.

From: "Remko Lodder" <remko at elvandar.org>
To: "Manjunath Tata" <manjut at juniper.net>
Cc: freebsd-gnats-submit at freebsd.org
Subject: Re: conf/130776: ip addresses like 10.1.1.1 with subnet mask 
     255.0.0.0 makes the box unreachable
Date: Tue, 20 Jan 2009 13:17:58 +0100 (CET)

 Dear Manjunath,
 
 On Tue, January 20, 2009 12:10 pm, Manjunath Tata wrote:
 >
 > bng-dlsw-bsd1# uname -a
 > FreeBSD bng-dlsw-bsd1.englab.juniper.net 4.11-RELEASE FreeBSD 4.11-RELEASE
 > #0: Fri Jan 21 17:21:22 GMT 2005
 
 Please note that 4.x is no longer supported, so if this is 4.x specific,
 it will not be resolved ...
 
 > root at perseus.cse.buffalo.edu:/usr/obj/usr/src/sys/GENERIC  i386
 >
 >>Description:
 > When an ip address in the 10 network i.e., say 10.1.1.1 with subnet mask
 > 255.0.0.0 makes the box unreachable.
 > The same doesn't happen with 11,12,13 and so on networks.
 > But, when i try to configure an ip address like "ifconfig em1 10.0.56.141
 > netmask 255.0.0.0" works fine and the link(em1 here) is up with the
 > address.
 >
 
 Sure, so you have configured an interface (em0) with a 10.x network and
 you configure the netmask to match a /A (/8, /255.0.0.0) range, this is a
 very very big range, which could make sure that the gateway that you
 normally use to reach the device, becomes unreachable (different broadcast
 address and things like that).
 
 Can you tell us more specifics about the "reachability" you need to have?
 How is the router configured through which you want to reach the box? Is
 em1 attached to the same network? or did you switch cables to get this
 far?
 
 Please let me know,
 
 Best regards,
 Remko
 
 
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