Ed Greshko wrote:
> Cameron Simpson wrote:
>> On 08Sep2008 21:04, Kevin J. Cummings <cummings(a)kjchome.homeip.net>
>>> Alan Evans wrote:
>>>> On Mon, Sep 8, 2008 at 6:40 AM, Steven Tardy
>>>>> kwhiskerz wrote:
>>>>> man hostid
>>>> On my Fedora 9...
>>>> $ hostid
>>>> Now I haven't bothered to check any other machines, but my initial
>>>> impression is that this is not going to work...
>>> I just checked the hostids on my 2 primary machines on the same
>>> local network. They just seem to be encodings of the machine's IP
>>> addresses. And since both are PC class machines, the addresses look
>>> to be syllable swapped (but not byte swapped).
>>> 192.168.6.94 and 192.168.6.106
>>> a8c05e06 and a8c06a06
>>> So, I have to ask, does the machine you tried it on have an IP address?
>> So, let us turn to the docs: man hostid says:
>> hostid - print the numeric identifier for the current host
>> The full documentation for hostid is maintained as a Texinfo manual
>> Gah. I hate this info-so-no-f'n-man-page rubbish!
>> But let's go: info hostid:
>> 21.4 `hostid': Print numeric host identifier.
>> `hostid' prints the numeric identifier of the current host in
>> hexadecimal. This command accepts no arguments. The only options are
>> `--help' and `--version'. *Note Common options::.
>> For example, here's what it prints on one system I use:
>> $ hostid
>> On that system, the 32-bit quantity happens to be closely related
>> to the
>> system's Internet address, but that isn't always the case.
>> Gah! Again!
>> I don't think I'd rely on hostid for anything:-(
> seeing the same (using dhcp for getting an ip address):
> backes@eule [backes]: hostid
> backes@eule [backes]: ifconfig
> eth0 Link encap:Ethernet HWaddr 00:0C:76:C0:40:36
> inet addr:192.168.179.182 Bcast:192.168.179.255
> UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
> RX packets:284 errors:0 dropped:0 overruns:0 frame:0
> TX packets:256 errors:0 dropped:0 overruns:0 carrier:0
> collisions:0 txqueuelen:1000
> RX bytes:86392 (84.3 KiB) TX bytes:25620 (25.0 KiB)
> Interrupt:22 Base address:0x2000
> Not seeing this effect on systems without dhcp usage.
FYI, the hostid does not use information from ifconfig. It looks for a
match between "hostname -s" and information in /etc/hosts. It then uses
the IP address contained there. No match then hostid returns 00000000.
It uses hostname for the match....not "hostname -r"....
Also, it will take the info in /etc/hosts first and if no match will do
a DNS lookup.
He knew the tavernes well in every toun. -- Geoffrey Chaucer