Could it be that your HTTP traffic is being passed through a web proxy that has the correct DNS entry cached?
- Alex
[EMAIL PROTECTED] wrote:
Hello,
I have a GBit Ethernet OSA port (qeth0) dedicated to an zLinux server (SLES7) under zVM. The IP address configured for this device is "172.16.111.101".
ifconfig output -------------------- wcs-mf-winxs-test:/etc # ifconfig eth0 eth0 Link encap:Ethernet HWaddr 00:02:55:9A:EC:9E inet addr:172.16.111.101 Bcast:172.16.111.255 Mask:255.255.255.0 inet6 addr: fe80::202:55ff:fe9a:ec9e/10 Scope:Link UP BROADCAST RUNNING NOARP MULTICAST MTU:1492 Metric:1 RX packets:7943862 errors:0 dropped:0 overruns:0 frame:0 TX packets:7837580 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:100 RX bytes:2873968609 (2740.8 Mb) TX bytes:3883613591 (3703.7 Mb)
When we had a DNS entry added to our name servers for this device for a WAS application, it was mistakenly added with IP address "172.16.111.103" (.103 instead of .101)
nslookup output ----------------------- wcs-mf-winxs-test:~ # nslookup testxs.moorewallace.com Server: wtc-wins2.moorewallace.int Address: 10.17.117.226
Name: testxs.moorewallace.com Address: 172.16.111.103
The strange thing about this is HTTP traffic is working! I can get to the application from a browser using:
http://172.16.111.103
or
http://testxs.moorewallace.com
I can ping the .103 address from another Linux server on the same subnet, but not FTP or TELNET. I can only FTP or TELNET to the .101 addresss, which is what I would expect.
ping output from system on 172.16.111.102 ---------------------------------------------------------------- wcs-mf-winxs-db2t:/proc/net # ping 172.16.111.103 PING 172.16.111.103 (172.16.111.103): 56 data bytes 64 bytes from 172.16.111.103: icmp_seq=0 ttl=127 time=0.655 ms 64 bytes from 172.16.111.103: icmp_seq=1 ttl=127 time=0.655 ms 64 bytes from 172.16.111.103: icmp_seq=2 ttl=127 time=0.659 ms
How is HTTP working to the 172.16.111.103 address when it doesn't appear to be configured on the device?
Thanks in advance,
Hank Calzaretta Moore Wallace, Inc.
