Hell yeah, I know SLES11 is absolute / not supported anymore. The latest version are SLES11 SP4, but I still using it on my test server. Hmm.. sometimes I forgot how to configure DNS on Suse Linux Enteprise Server (SLES) 11 then I believe puts public notes on my weblog will be great for everyone reference!
back to the topic, setup dns is easier to just overwrite generated file
$ vim /etc/resolv.conf # Generated by dhcpcd for interface eth1 search localdomain nameserver 192.168.100.2 nameserver 184.108.40.206 nameserver 220.127.116.11
After that execute
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