What's new on the 127.0.0/24 block in 7?

Andy Dills andy at xecu.net
Tue Mar 4 02:51:47 UTC 2008


On Mon, 3 Mar 2008, Chris H. wrote:

> Greetings,
> I'm having some difficulty working with anything past 127.0.0.1.
> It seems impossible to use (create) any addresses on the "loopback"
> past 127.0.0.1.
> More specifically; I installed rbldnsd from ports, and it worked quite
> well on a 6.x install. However, attempting the same config/install on
> a 7-RC3 install yields the inability to bind/create 127.0.0.2, or
> 127.0.0.3 for rbldnsd to answer on - all queries are refused. The
> same pinging/digging, etc.
> 
> The 2 servers have /exactly/ the same net setups, and DNS/rbldnsd
> configs. Yet no joy on the RELENG_7 box. So it /appears/ something
> in this area has changed since 6. But I'm unable to discover any
> info on it.
> 
> Thank you for all your time and consideration.

What subnet mask did you use when creating the 127.0.0.2 (etc) interfaces 
on lo0?

On 7.0-R, I just ifconfig'ed 127.0.0.2 as an alias to lo0 with a subnet 
mask of 255.255.255.255, and I was able to bind/listen/accept on it with 
no problem.

Andy

---
Andy Dills
Xecunet, Inc.
www.xecu.net
301-682-9972
---


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