利用 vyatta router 做簡單的DNS 設定
建立 record
set system static-host-mapping host-name mail.internal.lan
set system static-host-mapping host-name mail.internal.lan inet 192.168.1.250
刪除 record
delete system static-host-mapping host-name mail.internal.lan
delete system static-host-mapping host-name mail.internal.lan inet 192.168.1.250
這樣就可以解析出 mail.internal.lan 這個名稱
