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From Glasgow: -bash-3.2$ dig storage001.ppgrid1.rhul.ac.uk ; <<>> DiG 9.3.6-P1-RedHat-9.3.6-4.P1.el5_4.2 <<>> storage001.ppgrid1.rhul.ac.uk ;; global options: printcmd ;; Got answer: ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 12142 ;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 2, ADDITIONAL: 2 ;; QUESTION SECTION: ;storage001.ppgrid1.rhul.ac.uk. IN A ;; ANSWER SECTION: storage001.ppgrid1.rhul.ac.uk. 86400 IN A 134.219.225.21 ;; AUTHORITY SECTION: rhul.ac.uk. 84062 IN NS dns2.rhul.ac.uk. rhul.ac.uk. 84062 IN NS dns3.rhul.ac.uk. ;; ADDITIONAL SECTION: dns2.rhul.ac.uk. 18383 IN A 134.219.101.211 dns3.rhul.ac.uk. 18383 IN A 134.219.101.212 ;; Query time: 27 msec ;; SERVER: 130.209.16.6#53(130.209.16.6) ;; WHEN: Tue Aug 3 10:50:13 2010 ;; MSG SIZE rcvd: 133 -bash-3.2$ dig -x 134.219.225.21 ; <<>> DiG 9.3.6-P1-RedHat-9.3.6-4.P1.el5_4.2 <<>> -x 134.219.225.21 ;; global options: printcmd ;; Got answer: ;; ->>HEADER<<- opcode: QUERY, status: SERVFAIL, id: 47506 ;; flags: qr rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 0, ADDITIONAL: 0 ;; QUESTION SECTION: ;21.225.219.134.in-addr.arpa. IN PTR ;; Query time: 2 msec ;; SERVER: 130.209.16.6#53(130.209.16.6) ;; WHEN: Tue Aug 3 10:50:28 2010 ;; MSG SIZE rcvd: 45 It does look like the reverse lookup is a bit shonky. Sam On 3 August 2010 10:46, Stephen Burke <[log in to unmask]> wrote: > Testbed Support for GridPP member institutes >> [mailto:[log in to unmask]] On Behalf Of Simon George said: >> I am unable to reproduce this, either at CERN or at RHUL. Can anyone >> else see any problem like this from their site? > > From RAL (PPD and tier-1): > > host storage001.ppgrid1.rhul.ac.uk > storage001.ppgrid1.rhul.ac.uk has address 134.219.225.21 > > host 134.219.225.21 > Host 21.225.219.134.in-addr.arpa not found: 2(SERVFAIL) > > Stephen >