{"id":140,"date":"2017-10-16T04:06:00","date_gmt":"2017-10-16T04:06:00","guid":{"rendered":"https:\/\/linuxadmin.melberi.com\/uncategorized\/dhcpc4228-non-null-pointer"},"modified":"2017-10-16T09:29:43","modified_gmt":"2017-10-16T09:29:43","slug":"dhcpc4228-non-null-pointer","status":"publish","type":"post","link":"https:\/\/www.melberi.com\/linuxadmin\/dhcp\/dhcpc4228-non-null-pointer","title":{"rendered":"dhcp.c(4228): non-null pointer – Error"},"content":{"rendered":"

Error dhcp.c(4228): non-null pointer<\/p>\n

DHCP Error:<\/u><\/h3>\n

[ dhcp.c(4228): non-null pointer <\/b>] error in my message log
\nThis error is due to improper reverse dns configuration.<\/p>\n

I checked nslookup for my dhcp server ip address. Reverse DNS was not configure<\/p>\n

[root@dhcpsrv01 etc]# nslookup 192.168.1.1<\/b>
\nServer:\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 127.0.0.1<\/b>
\nAddress:\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 127.0.0.1#53<\/b>
\n
\n<\/b>
\n** server can’t find 1.1.168.192.in-addr.arpa.: NXDOMAIN<\/b><\/div>\n

Then I add the reverse DNS entry for my dhcp server and rechecked nslookup<\/b><\/p>\n

\u00a0[Administrator@teqbdc01 etc]# nslookup 192.168.1.1<\/b>
\nServer:\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 ns0.example.com<\/b>
\nAddress:\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 ns0.example.com#53<\/b>
\n
\n<\/b>
\n1.1.168.192.in-addr.arpa\u00a0 name = dhcpsrv01.domain.com.<\/b><\/div>\n

Now I checked the message log and I found that error message was stopped printing.<\/p>\n

Sample Files <\/b><\/u><\/h3>\n

edit \/etc\/reslove.conf
\nnameserver ns0.example.com\u00a0\u00a0<\/b> #primary dns server
<\/b>
\nnameserver 192.168.1.1<\/b><\/p>\n

Edit\u00a0 \/etc\/hosts<\/p>\n

127.0.0.1\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 localhost.localdomain localhost<\/b><\/div>\n
192.168.1.1\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 dhcpsrv01.domain.com\u00a0\u00a0\u00a0\u00a0\u00a0 dhcpsrv01<\/b><\/div>\n","protected":false},"excerpt":{"rendered":"

Error dhcp.c(4228): non-null pointer DHCP Error: [ dhcp.c(4228): non-null pointer ] error in my message log This error is due to improper reverse dns configuration. I checked nslookup for my… Read more »<\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[137],"tags":[],"class_list":["post-140","post","type-post","status-publish","format-standard","hentry","category-dhcp"],"aioseo_notices":[],"aioseo_head":"\n\t\t\n\t\n\t\n\t\n\t\n\t\n\t\t\n\t\t