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Uhm, I'm coming to this discussion late, but aren't all 127.0.0.0/8
addresses defined to be loopback? Apparently defined in RFC3330.
Quoting wikipedia:
| Most TCP/IP implementations support a loopback interface, which is a
virtual software interface, i.e., not connected to any hardware, but
fully integrated into the computer system's internal network
infrastructure. Any traffic that a computer program sends on the
loopback network is immediately received on the same interface.
|
| Correspondingly, the Internet Protocol (IP) specifies a loopback
network. In IPv4 this is the network 127/8 ("this network", RFC 3330),
and in IPv6 it is the ::1/128 prefix (RFC 3513). The most commonly used
IP address on the loopback device is 127.0.0.1 for IPv4, although any
address between 127.0.0.0 and 127.255.255.255 is mapped to it. In IPv6
the loopback prefix consists of only one single address. 0:0:0:0:0:0:0:1
(also written as ::1). The standard, officially reserved, domain name
for these addresses is localhost (RFC 2606).
So, as far as the underlaying network stack is concerned, it shouldn't
matter which 127.* address you actually define to be the loopback address.
Of course, applications can and do propagate their own brokenesses.
- -- Pat
John Summerfield wrote:
| Alan Altmark wrote:
|> On Thursday, 09/11/2008 at 10:39 EDT, Michael
|> MacIsaac/Poughkeepsie/[EMAIL PROTECTED] wrote:
|>> I can see how SuSE/Novell can argue that it is a valid value (i.e.
|>> "working as designed"), but if it affects important applications such as
|>> SAP and DB2, I can see how it might be viewed as a bug by the customer.
|>
|> I can't see how they can argue that at all. While it wasn't manually
| Who?
|> added by the user, it still smells of some special one-off for some
|> strange app that is binding to 127.0.0.2 (a hidden web server?). Adding
|
| Big secret:
| 09:06 [EMAIL PROTECTED] ~]$ ping -R -c3 127.2.3.4
| PING 127.2.3.4 (127.2.3.4) 56(124) bytes of data.
| 64 bytes from 127.2.3.4: icmp_seq=1 ttl=64 time=0.085 ms
| RR: 127.2.3.4
| 127.2.3.4
| 127.2.3.4
| 127.2.3.4
|
| 64 bytes from 127.2.3.4: icmp_seq=2 ttl=64 time=0.072 ms (same
| route)
| 64 bytes from 127.2.3.4: icmp_seq=3 ttl=64 time=0.075 ms (same
| route)
|
| --- 127.2.3.4 ping statistics ---
| 3 packets transmitted, 3 received, 0% packet loss, time 1998ms
| rtt min/avg/max/mdev = 0.072/0.077/0.085/0.009 ms
| 09:07 [EMAIL PROTECTED] ~]$
|
| I found at some time ago, when I wanted a webserver on its own IP
| address on my laptop, that Linux treats all the 127.x.y.z addresses
| (that I tried) the same.
|
|
|
|> the hostname to /etc/hosts allows the traditional daemon
|> reverse-lookup to
|> work and report the local host name instead of the more traditional
|> "localhost". I'd argue that I'd rather see the resolver changed to
|> return
|> the defined hostname instead of localhost than have spurious entries in
|> /etc/hosts. Shouldn't 127.0.0.3 resolve to the same name?
|>
|> Has anyone opened a problem with Novell, asking why they added it?
|>
|> If it's a new standard, I'd like to see the reference to the standard.
|>
|> Alan Altmark
|> z/VM Development
|> IBM Endicott
|>
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|>
|
|
| --
|
| Cheers
| John
|
| -- spambait
| [EMAIL PROTECTED] [EMAIL PROTECTED]
| -- Advice
| http://webfoot.com/advice/email.top.php
| http://www.catb.org/~esr/faqs/smart-questions.html
| http://support.microsoft.com/kb/555375
|
| You cannot reply off-list:-)
|
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