There is nothing special about the name localhost. You must define that in your TCPIP system as a name with an associate IP address of 127.0.0.1 for it to exist. In our case, the DNS people actually have the Windows DNS set up to do this mapping for us. The output from the z/OS UNIX "dig" command shows:
dig localhost Allocated socket 6, type udp ; <<>> DiG 9.2.0 <<>> localhost ;; global options: printcmd ;; Got answer: ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 49597 ;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 0 ;; QUESTION SECTION: ;localhost. IN A ;; ANSWER SECTION: localhost. 600 IN A 127.0.0.1 ;; Query time: 1 msec ;; SERVER: 10.170.5.8#53(10.170.5.8) ;; WHEN: Thu Apr 11 10:49:14 2013 ;; MSG SIZE rcvd: 43 10.170.5.8 is out internal IP address of our Windows DNS machine. The above show your DNS machines to be at 159.105.23.130 and 170.222.64.130. Whoever controls those servers needs to define the name "localhost". Doing a reverse map, those map to ns1.state.vt.us and ns2.state.vt.us and so I guess they are "owned" by the state of Vermont. You might want to make your own local look ability, which is done with the DEFAULTIPNODES or GLOBALIPNODES which are documented here: http://publibz.boulder.ibm.com/cgi-bin/bookmgr_OS390/BOOKS/F1A1B4A1/5.5 http://publibz.boulder.ibm.com/cgi-bin/bookmgr_OS390/BOOKS/F1A1B4A1/5.7 On Thu, Apr 11, 2013 at 10:22 AM, Campbell, Breck <[email protected]> wrote: > When I try to ping loopback the command fails with; > > EZZ3111I Unknown host 'LOOPBACK' > > But when I ping 127.0.0.1 the command works; > > CS V1R13: Pinging host 127.0.0.1 > Ping #1 response took 0.001 seconds. > *** > > We are running with the following resolver configuration; > > BROWSE /SYSTEM/etc/resolv.conf Line > Command ===> > ********************************* Top of Data ************ > TCPIPJOBNAME TCPFTP > A7JES2: HOSTNAME MVS2FTP > DOMAINORIGIN CIT.STATE.VT.US > NSINTERADDR 159.105.23.130 > NSINTERADDR 170.222.64.130 > ******************************** Bottom of Data ********** > > Do I have to add something here to get the system to recognize the loopback > host? > > > > Breck Campbell > > Systems Developer II > > State of Vermont > > Dept of Information and Innovation > > 1 National Life Dr.. > > Montpelier, VT 05633-3701 > > phone 802-828-4692 > > fax 802-828-4677 > > email [email protected] > > > ---------------------------------------------------------------------- > For IBM-MAIN subscribe / signoff / archive access instructions, > send email to [email protected] with the message: INFO IBM-MAIN -- This is a test of the Emergency Broadcast System. If this had been an actual emergency, do you really think we'd stick around to tell you? Maranatha! <>< John McKown ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: INFO IBM-MAIN
