Date: Thu, 22 Apr 1999 16:02:54 -0400 From: Jason Canon <jcanon@comtechnologies.com> To: David Schwartz <davids@webmaster.com> Cc: Igor Roshchin <igor@physics.uiuc.edu>, stable@freebsd.org Subject: Re: netstat -r Message-ID: <371F806E.57FABC85@comtechnologies.com> References: <000001be8cf7$fb2eed80$021d85d1@whenever.youwant.to>
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Ordinarily I would agree with you completely but what Igor and I are both saying is that something external to our environments (e.g., IANA) appears to have been the source. My /etc/hosts file contains resolution for all private IPs in use on the LAN. This has been working fine for almost 1 year but during the past 24 hours or so the server ignored the hosts file and printed an IANA resolution instead. David Schwartz wrote: > The problem will not 'clear up' in any reasonable sense of the word until > you either: > > 1) Fix your nameserver so that it stops trying to resolve private IPs using > the global Internet's DNS fabric, or > > 2) Fix your machines so that they no longer try to reverse resolve private > IPs on name servers not configured to handle it. > > So long as you are relying on private IP space to behave in a particular > way on the global Internet, when there are no such guarantees, your > configuration is broken. Private IPs are supposed to be quarrantined from > the global Internet. > > DS > > > -----Original Message----- > > From: Jason Canon [mailto:jcanon@comtechnologies.com] > > Sent: Thursday, April 22, 1999 11:40 AM > > To: Igor Roshchin > > Cc: David Schwartz; stable@freebsd.org > > Subject: Re: netstat -r > > > > > > I do believe you are correct about someone at IANA performing a bit of > > "tweaking". The problem on our server cleared up with no action > > on our part. > > > > Thanks, > > Jason > > > > Igor Roshchin wrote: > > > > > > > Our FreeBSD server has been in operation for about a year > > and it just > > > > > runs like a charm. Every so often > > > > > I do "netstat -r" just to make sure that I'm still being > > the bandwidth > > > > > hog on our network. Today, however, > > > > > instead of the customary inverse-mapping that I get from > > the /etc/hosts > > > > > file I got a note on each listing saying: > > > > > > > > > > "read-rfc1918-for-details.iana.net" followed by our Private IP > > > > > Address and Ethernet Address > > > > > > > > > > What could have changed to create this output? We have always been > > > > > using RFC 1918 addressing > > > > > along with NAT. > > > > > > > > It's telling you that you tried to reverse resolve an > > IP address that was > > > > private without configuring your name server to reverse them > > correctly. > > > > > > > > DS > > > > > > > > > > I don't think so. > > > As one of the previous responders noted, for some reason, > > > today at least several hosts in 10.x.x.x zone had the reverse lookup > > > set to show read-rfc1918-for-details.iana.net > > > > > > I had seen it myself for our regional router (or whatever it is) - > > > today mid-day, then it turned back to be nameless again. > > > > > > It looks like somebody at IANA was tweaking (I hope not hacking :) > > > the DNS for 10.0.0.1 or its part. > > > > > > IgoR > > > > > > To Unsubscribe: send mail to majordomo@FreeBSD.org > > > with "unsubscribe freebsd-stable" in the body of the message > > To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-stable" in the body of the message
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