想請教大大兩個問題 1.DNS解析錯誤 2.DHCP 發生Client取到錯誤ip。
目前都已解決，是想請教說，有沒有方式可以查到發生原因源頭，
可以避免以及是否有相關檢查工具?

感謝各位大大的教學

1.DNS解析錯誤

Domain:domin.com
Sub domain: cloud.domin.com

我管理的AD是屬Sub domain，此次發生問題為我client端電腦，向我<cloud.domin.com>DNS解析web1.domin.com的ip是為外部ip，導致無法顯示畫面
像domin.com解析ip即為內部ip，才可正常登入。
目前做法是在我管理的DNS上清除cache，在解析web1.domin.com，才顯示正常
想請教說，有甚麼方式會導致這樣的情形，有沒有方式追查到是哪一台DNS有這種錯誤對應，
導致我查詢出錯?

2.DHCP 發生Client取到錯誤ip

請問有一台台DHCP再派發10.97的ip，不過近幾日發生，我的電腦像DHCP要IP時，
他取到的的是192.168.30.x這段的ip，我將DHCP服務停掉後將設備ipconfig /release
取到的ip就是168.95.1.1，而不會取到192.168.30.x這段，
因此因該不是同網段有多台DHCP再派發，
目前將大量的設備改用固定IP，少量的設備由DHCP派發，目前取得ip的狀態都正常，取到10.97.x.x這段。

想請教一下這部分問題，是因為同一時間大量向DHCP要ip所發生的嗎?
有沒有DeBug方式，可以分享，讓小弟學習一下?

附上當下發生錯誤時，找到DHCP2的log，擷取一小段
16,06/14/16,02:16:45,已刪除,10.97.1.65,,0000610A01005056967F9C,cloud\Administrator,0,6,,,
30,06/14/16,02:16:45,DNS 更新要求,10.97.1.65,docxp-01.domin.com,,cloud\Administrator,0,6,,,
16,06/14/16,02:16:45,已刪除,10.97.1.35,,0000610A0100505696642F,cloud\Administrator,0,6,,,
30,06/14/16,02:16:45,DNS 更新要求,10.97.1.35,docxp-02.domin.com,,cloud\Administrator,0,6,,,
16,06/14/16,02:16:45,已刪除,10.97.1.231,,0000610A01005056960F9B,cloud\Administrator,0,6,,,
30,06/14/16,02:16:45,DNS 更新要求,10.97.1.231,docxp-03.domin.com,,cloud\Administrator,0,6,,,
16,06/14/16,02:16:45,已刪除,10.97.1.194,,0000610A01005056964CC3,cloud\Administrator,0,6,,,
30,06/14/16,02:16:45,DNS 更新要求,10.97.1.194,docxp-04.domin.com,,cloud\Administrator,0,6,,,
16,06/14/16,02:16:45,已刪除,10.97.1.51,,0000610A0100505696251D,cloud\Administrator,0,6,,,
30,06/14/16,02:16:45,DNS 更新要求,10.97.1.51,docxp-05.domin.com,,cloud\Administrator,0,6,,,
16,06/14/16,02:16:45,已刪除,10.97.2.208,,0000610A010050569637EE,cloud\Administrator,0,6,,,
30,06/14/16,02:16:45,DNS 更新要求,10.97.2.208,docxp-05.domin.com,,cloud\Administrator,0,6,,,
32,06/14/16,02:16:45,DNS 成功更新,10.97.1.65,docxp-01.domin.com,,,0,6,,,
32,06/14/16,02:16:45,DNS 成功更新,10.97.1.35,docxp-02.domin.com,,,0,6,,,
32,06/14/16,02:16:45,DNS 成功更新,10.97.1.231,docxp-03.domin.com,,,0,6,,,
32,06/14/16,02:16:45,DNS 成功更新,10.97.1.194,docxp-04.domin.com,,,0,6,,,
32,06/14/16,02:16:45,DNS 成功更新,10.97.1.51,docxp-05.domin.com,,,0,6,,,
32,06/14/16,02:16:45,DNS 成功更新,10.97.2.208,docxp-05.domin.com,,,0,6,,,
15,06/14/16,02:16:48,NACK,192.168.30.16,,005056963563,,0,6,,,
15,06/14/16,02:16:48,NACK,192.168.30.55,,00505696471F,,0,6,,,
15,06/14/16,02:16:50,NACK,192.168.30.61,,00505696107F,,0,6,,,
30,06/14/16,02:16:50,DNS 更新要求,10.97.1.112,tet07.cloud.domin.com,,,0,6,,,
30,06/14/16,02:16:50,DNS 更新要求,10.97.1.112,tet07.cloud.domin.com,,,0,6,,,
11,06/14/16,02:16:50,更新,10.97.1.112,tet07.cloud.domin.com,00505696107F,,3101680553,0,,,
31,06/14/16,02:16:50,DNS 更新失敗,10.97.1.112,tet07.cloud.domin.com,,,0,6,,,
31,06/14/16,02:16:50,DNS 更新失敗,10.97.1.112,tet07.cloud.domin.com,,,0,6,,,
15,06/14/16,02:16:51,NACK,192.168.30.64,,00505696006C,,0,6,,,
30,06/14/16,02:16:51,DNS 更新要求,10.97.1.116,tet16.cloud.domin.com,,,0,6,,,
30,06/14/16,02:16:51,DNS 更新要求,10.97.1.116,tet16.cloud.domin.com,,,0,6,,,
11,06/14/16,02:16:51,更新,10.97.1.116,tet16.cloud.domin.com,00505696006C,,2437558809,0,,,
32,06/14/16,02:16:51,DNS 成功更新,10.97.1.116,tet16.cloud.domin.com,,,0,6,,,
32,06/14/16,02:16:51,DNS 成功更新,10.97.1.116,tet16.cloud.domin.com,,,0,6,,,
15,06/14/16,02:16:51,NACK,192.168.30.65,,005056963FA4,,0,6,,,
30,06/14/16,02:16:51,DNS 更新要求,10.97.1.117,tet19.cloud.domin.com,,,0,6,,,
30,06/14/16,02:16:51,DNS 更新要求,10.97.1.117,tet19.cloud.domin.com,,,0,6,,,
11,06/14/16,02:16:51,更新,10.97.1.117,tet19.cloud.domin.com,005056963FA4,,3738048107,0,,,
32,06/14/16,02:16:51,DNS 成功更新,10.97.1.117,tet19.cloud.domin.com,,,0,6,,,
32,06/14/16,02:16:51,DNS 成功更新,10.97.1.117,tet19.cloud.domin.com,,,0,6,,,
15,06/14/16,02:16:52,NACK,192.168.30.63,,005056964720,,0,6,,,