Your environment must be much different then mine. We have had some fairly spectacular failures of our DNS servers, however I could not allow production work to stop because of them.
-----Original Message----- From: Linux on 390 Port [mailto:[EMAIL PROTECTED] Behalf Of John Summerfield Sent: Tuesday, September 16, 2008 8:24 PM To: [email protected] Subject: Re: 127.0.0.2 in /etc/hosts? Fargusson.Alan wrote: > Sorry, I can't do anything about they way my mailer replies. Exchange > administrators handle all of that. > > I think we have lost site of the question I was addressing. You should have > an entry in /etc/hosts for you system, which should be the same as the one in > DNS if you have DNS. This entry for the system name is not required though. > The IP address in /etc/hosts can be a 127.* address, or it can be the real IP > address of you system. If the entry in /etc/hosts is the real IP address it > must be routed to the loopback interface because real hardware does not send > and receive at the same time, so without the route to the loopback interface > you cannot access your system from your system. Note that virtual networks > may not have this restriction. It seems pretty likely that the information in entry shown in this thread is _not_ the same as DNS would provide. > > So: the question of which IP address goes into /etc/hosts makes no difference > to the question of will things work locally if the interface is down. Some > seem to be seeing some odd behavior of the loopback interface if the eth > interface is down, so perhaps you would get what you want either way. It > occurs to me that perhaps the eth and lo drivers in Linux are linked in some > way, so maybe it doesn't matter if you don't route the local IP to the > loopback interface. This might explain what some are seeing. If the eth interface is down, the system will not talk to anyone. If it has the bogus information above for the resolver to respond with, it might boot quickly and appear, locally, to be working when in fact it's not. If the resolver can't get answers and times out, booting will be slow and the problem abundantly clear. > -- 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:-) ---------------------------------------------------------------------- For LINUX-390 subscribe / signoff / archive access instructions, send email to [EMAIL PROTECTED] with the message: INFO LINUX-390 or visit http://www.marist.edu/htbin/wlvindex?LINUX-390 __________________________________________________________________________________________________ CONFIDENTIALITY NOTICE: This email from the State of California is for the sole use of the intended recipient and may contain confidential and privileged information. Any unauthorized review or use, including disclosure or distribution, is prohibited. If you are not the intended recipient, please contact the sender and destroy all copies of this email.
