Domain-Name-System
為什麼 host 和 nslookup 可以解析名稱而 dig 不能?
誰能告訴我為什麼會這樣?我可以使用 host 和/或 nslookup 解析主機名,但正向查找不適用於 dig;反向查找:
musashixxx@box:~$ host someserver someserver.somenet.internal has address 192.168.0.252 musashixxx@box:~$ host 192.168.0.252 252.0.168.192.in-addr.arpa domain name pointer someserver.somenet.internal. musashixxx@box:~$ nslookup someserver Server: 192.168.0.253 Address: 192.168.0.253#53 Name: someserver.somenet.internal Address: 192.168.0.252 musashixxx@box:~$ nslookup 192.168.0.252 Server: 192.168.0.253 Address: 192.168.0.253#53 252.0.168.192.in-addr.arpa name = someserver.somenet.internal. musashixxx@box:~$ dig someserver ; <<>> DiG 9.8.1-P1 <<>> someserver ;; global options: +cmd ;; Got answer: ;; ->>HEADER<<- opcode: QUERY, status: SERVFAIL, id: 55306 ;; flags: qr rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 0, ADDITIONAL: 0 ;; QUESTION SECTION: ;someserver. IN A ;; Query time: 0 msec ;; SERVER: 192.168.0.253#53(192.168.0.253) ;; WHEN: Wed Oct 3 15:47:38 2012 ;; MSG SIZE rcvd: 27 musashixxx@box:~$ dig -x 192.168.0.252 ; <<>> DiG 9.8.1-P1 <<>> -x 192.168.0.252 ;; global options: +cmd ;; Got answer: ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 28126 ;; flags: qr aa rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 0 ;; QUESTION SECTION: ;252.0.168.192.in-addr.arpa. IN PTR ;; ANSWER SECTION: 252.0.168.192.in-addr.arpa. 3600 IN PTR someserver.somenet.internal. ;; Query time: 0 msec ;; SERVER: 192.168.0.253#53(192.168.0.253) ;; WHEN: Wed Oct 3 15:49:11 2012 ;; MSG SIZE rcvd: 86
這是我的 resolv.conf 的樣子:
nameserver 192.168.0.253 search somenet.internal
這種行為正常嗎?有什麼想法嗎?
dig 的預設行為是不使用搜尋選項。
從手冊頁:
+[no]search Use [do not use] the search list defined by the searchlist or domain directive in resolv.conf (if any). The search list is not used by default.
編輯:只需添加
+search
以使其工作,例如dig +search myhost
.
在我的情況下,這是 Microsoft DNS 伺服器中的一個錯誤,它會為帶有選項集
FORMERR
的請求返迴響應(請求格式錯誤) 。EDNS Cookie
較新版本dig
(9.11 及更高版本)預設使用 dns-cookies。這可以通過+nocookie
或+noedns
標誌來防止:$ dig +nocookie DOMAIN @SERVER
資料來源:https ://kevinlocke.name/bits/2017/01/20/formerr-from-microsoft-dns-server-for-dig/