Problem with DHCP, /etc/hosts and GNOME
Rick Stevens
rstevens at vitalstream.com
Thu Apr 8 22:00:31 UTC 2004
Keven Ring wrote:
> Rick Stevens wrote:
>
>> Keven Ring wrote:
>>
>>> William Hooper wrote:
>>>
>>>> Satish Balay said:
>>>>
>>>>
>>>>
>>>>> Ah.. I interptered it as - an option to dhcp-clinet (not server) to
>>>>> ignore what dhcp server says - and use the provided value as the
>>>>> hostname. Perhpas there should be some other option for this
>>>>> functionality? (RFE)
>>>>>
>>>>> I don't like hostname changing (when you move laptop between networks)
>>>>> - this changes xauth which messes up everything else..
>>>>>
>>>>
>>>>
>>>>
>>>>
>>>> A quick browse through the networking scripts suggests that the
>>>> hostname
>>>> will only change if it is "localhost". I haven't looked too hard
>>>> though. I know that I don't have a problem with my laptop, which I
>>>> set the
>>>> hostname on during install (but that was with RHL 9 and an upgrade to
>>>> FC1). It may be more of a case of the DHCP servers I'm using not
>>>> trying
>>>> to change the hostname, though.
>>>>
>>>>
>>>>
>>>>
>>> It's in the /etc/sysconfig/network-scripts/network-functions script.
>>> There is a function called need_hostname().
>>>
>>> Returns 0 if the current hostname is "localhost",
>>> "localhost.localdomain" or "(none)". Returns 1 otherwise. This
>>> function is called in the /etc/sysconfig/network-scripts/ifup
>>> script. However, again, just like everything else, just because the
>>> DHCP client *requests* a hostname, does not mean that the DHCP server
>>> is obliged to hand one back...
>>
>>
>>
>> And you're not "obligated" to accept it. You can set
>>
>> supersede host-name "your-host-name"
>>
>> in your /etc/dhclient/dhclient.conf file to override whatever the DHCP
>> server gives you. see "dhclient.conf(5)" and "dhcp-options(5)" for
>> info.
>>
> Of course, if you tell the DHCP server what you want your hostname to
> be, *and* ask for the DHCP server to provide one back to you, *and*
> disregard the hostname that the DHCP server sends back, then you have an
> awfully friendly system... :)
Heheheh! Yup, that's the effect of it.
> DHCP Client: Please set my host name to xxx.yyy.zzz.
> DHCP Server: No chance. Your host name is aaa.bbb.ccc
> DHCP Client: Screw you. I'm setting my hostname to mmm.nnn.ooo
>
> Fine. Is everyone happy now?
"I wanna be thishost.thisdomain.tld and regardless of what you say,
that's what I'm gonna be! When I want your opinion, Mr. DHCP server,
I'll beat it out of you! Neener, neener! Thhppt!"
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- Rick Stevens, Senior Systems Engineer rstevens at vitalstream.com -
- VitalStream, Inc. http://www.vitalstream.com -
- -
- Millihelen, adj: The amount of beauty required to launch one ship. -
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