## Can't in/decrease DHCP range; "IP address is in the range of an existing network" Hello folks, I can't change the dhcp range on a CP 1450 appliance; "IP address is in the range of an existing network". I don't see that anything overlaps with the range. Deactivating/ reactivating DHCP and rebooting was of no help. The firmware is up to date. Please see attached screenshots; no matter if I try to increase or decrease the DHCP-scope, error stays the same. Am I doing something wrong here or is this a bug? Thanks in advance! _Appliance:Check Point 1450 Appliance (rmg-oregon-fw01)_ _Security Management:Locally managed_ _Version (Firmware):R77.20.70 (990171948)_ - Tags: - [dhcp](https://community.checkpoint.com/t5/tag/dhcp/tg-p/board-id/smb-smp) [lan.PNG](https://community.checkpoint.com/t5/Spark-Firewall-SMB/Can-t-in-decrease-DHCP-range-quot-IP-address-is-in-the-range-of/m-p/24195/thread-id/1014?attachment-id=159) Preview file 35 KB [dhcp-err.PNG](https://community.checkpoint.com/t5/Spark-Firewall-SMB/Can-t-in-decrease-DHCP-range-quot-IP-address-is-in-the-range-of/m-p/24195/thread-id/1014?attachment-id=160) Preview file 35 KB 0 Kudos [Click here to give kudos to this post.](https://community.checkpoint.com/t5/forums/v5/forumtopicpage.kudosbuttonv2.kudoentity:kudoentity/kudosable-gid/24195?t:ac=board-id/smb-smp/message-id/1014/thread-id/1014&t:cp=kudos/contributions/tapletcontributionspage&ticket=ka4t3cAoc9O7_-1 "Click here to give kudos to this post.") 1 2 3 4 5 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 [Reply](https://community.checkpoint.com/t5/Spark-Firewall-SMB/Can-t-in-decrease-DHCP-range-quot-IP-address-is-in-the-range-of/m-p/24195) - [All forum topics](https://community.checkpoint.com/t5/Spark-Firewall-SMB/bd-p/smb-smp/page/161 "Spark Firewall (SMB)") - [Previous Topic](https://community.checkpoint.com/t5/Spark-Firewall-SMB/Upgrade-1470-to-1490/td-p/16304 "Upgrade 1470 to 1490") - [Next Topic](https://community.checkpoint.com/t5/Spark-Firewall-SMB/1430-Setup-for-Management/td-p/15084 "1430 Setup for Management") 1 Solution Accepted Solutions [G\_W\_Albrecht](https://community.checkpoint.com/t5/user/viewprofilepage/user-id/21294) MVP Silver ‎2018-02-0803:35 AM [Show option menu](https://community.checkpoint.com/t5/Spark-Firewall-SMB/Can-t-in-decrease-DHCP-range-quot-IP-address-is-in-the-range-of/m-p/24195# "Show option menu") - Mark as New - Bookmark - Subscribe - Mute - [Subscribe to RSS Feed](https://community.checkpoint.com/rss/message?board.id=smb-smp&message.id=1016) - [Permalink](https://community.checkpoint.com/t5/Spark-Firewall-SMB/Can-t-in-decrease-DHCP-range-quot-IP-address-is-in-the-range-of/m-p/24197/highlight/true#M1016) - [Print](https://community.checkpoint.com/t5/forums/forumtopicprintpage/board-id/smb-smp/message-id/1016/print-single-message/true/page/1) - [Report Inappropriate Content](https://community.checkpoint.com/t5/notifications/notifymoderatorpage/message-uid/24197) [Jump to solution](https://community.checkpoint.com/t5/Spark-Firewall-SMB/Can-t-in-decrease-DHCP-range-quot-IP-address-is-in-the-range-of/m-p/24197#M1016) This error is the "IP address is in the subnet of an existing network" error (not range), and according to the available documentation, this could be the bug from _sk111840 VTI creation on SMB Appliance fails with "IP address is in the subnet of an existing network" error_, but as you use R77.20.70 and it was already resolved in R77.20.40 firmware, it looks to me as Dameon wrote - either a configuration error or a new bug . | | | | --- | --- | | | | CCSP - CCSE / CCTE / CTPS / CCME / CCSM Elite / SMB Specialist [View solution in original post](https://community.checkpoint.com/t5/Spark-Firewall-SMB/Can-t-in-decrease-DHCP-range-quot-IP-address-is-in-the-range-of/m-p/24197#M1016) 0 Kudos [Click here to give kudos to this post.](https://community.checkpoint.com/t5/forums/v5/forumtopicpage.kudosbuttonv2.kudoentity:kudoentity/kudosable-gid/24197?t:ac=board-id/smb-smp/message-id/1014/thread-id/1014&t:cp=kudos/contributions/tapletcontributionspage&ticket=ka4t3cAoc9O7_-1 "Click here to give kudos to this post.") 1 2 3 4 5 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 [Reply](https://community.checkpoint.com/t5/Spark-Firewall-SMB/Can-t-in-decrease-DHCP-range-quot-IP-address-is-in-the-range-of/m-p/24195) 3 Replies [PhoneBoy](https://community.checkpoint.com/t5/user/viewprofilepage/user-id/7) Admin ‎2018-01-1902:56 PM - Mark as New - Bookmark - Subscribe - Mute - [Subscribe to RSS Feed](https://community.checkpoint.com/rss/message?board.id=smb-smp&message.id=1015) - [Permalink](https://community.checkpoint.com/t5/Spark-Firewall-SMB/Can-t-in-decrease-DHCP-range-quot-IP-address-is-in-the-range-of/m-p/24196/highlight/true#M1015) - [Print](https://community.checkpoint.com/t5/forums/forumtopicprintpage/board-id/smb-smp/message-id/1015/print-single-message/true/page/1) - [Report Inappropriate Content](https://community.checkpoint.com/t5/notifications/notifymoderatorpage/message-uid/24196) [Jump to solution](https://community.checkpoint.com/t5/Spark-Firewall-SMB/Can-t-in-decrease-DHCP-range-quot-IP-address-is-in-the-range-of/m-p/24197#M1016) When I've seen this error, it's because the subnet may be in use by some other interface. Worst case, I recommend engaging with the TAC: [Contact Support \| Check Point Software](http://www.checkpoint.com/support-services/contact-support/index.html "http://www.checkpoint.com/support-services/contact-support/index.html") 0 Kudos [Click here to give kudos to this post.](https://community.checkpoint.com/t5/forums/v5/forumtopicpage.kudosbuttonv2.kudoentity:kudoentity/kudosable-gid/24196?t:ac=board-id/smb-smp/message-id/1014/thread-id/1014&t:cp=kudos/contributions/tapletcontributionspage&ticket=ka4t3cAoc9O7_-1 "Click here to give kudos to this post.") 1 2 3 4 5 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 [Reply](https://community.checkpoint.com/t5/Spark-Firewall-SMB/Can-t-in-decrease-DHCP-range-quot-IP-address-is-in-the-range-of/m-p/24195) [G\_W\_Albrecht](https://community.checkpoint.com/t5/user/viewprofilepage/user-id/21294) MVP Silver ‎2018-02-0803:35 AM [Jump to solution](https://community.checkpoint.com/t5/Spark-Firewall-SMB/Can-t-in-decrease-DHCP-range-quot-IP-address-is-in-the-range-of/m-p/24197#M1016) | | | | --- | --- | | | | CCSP - CCSE / CCTE / CTPS / CCME / CCSM Elite / SMB Specialist 0 Kudos 1 2 3 4 5 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 [Reply](https://community.checkpoint.com/t5/Spark-Firewall-SMB/Can-t-in-decrease-DHCP-range-quot-IP-address-is-in-the-range-of/m-p/24195) [Julius\_Kaiser](https://community.checkpoint.com/t5/user/viewprofilepage/user-id/17202) Participant ‎2018-04-1702:47 AM - Mark as New - Bookmark - Subscribe - Mute - [Subscribe to RSS Feed](https://community.checkpoint.com/rss/message?board.id=smb-smp&message.id=1017) - [Permalink](https://community.checkpoint.com/t5/Spark-Firewall-SMB/Can-t-in-decrease-DHCP-range-quot-IP-address-is-in-the-range-of/m-p/24198/highlight/true#M1017) - [Print](https://community.checkpoint.com/t5/forums/forumtopicprintpage/board-id/smb-smp/message-id/1017/print-single-message/true/page/1) - [Report Inappropriate Content](https://community.checkpoint.com/t5/notifications/notifymoderatorpage/message-uid/24198) [Jump to solution](https://community.checkpoint.com/t5/Spark-Firewall-SMB/Can-t-in-decrease-DHCP-range-quot-IP-address-is-in-the-range-of/m-p/24197#M1016) Thank you guys! CP ruled out configuration errors here and approved an RMA. 0 Kudos [Click here to give kudos to this post.](https://community.checkpoint.com/t5/forums/v5/forumtopicpage.kudosbuttonv2.kudoentity:kudoentity/kudosable-gid/24198?t:ac=board-id/smb-smp/message-id/1014/thread-id/1014&t:cp=kudos/contributions/tapletcontributionspage&ticket=ka4t3cAoc9O7_-1 "Click here to give kudos to this post.") 1 2 3 4 5 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 [Reply](https://community.checkpoint.com/t5/Spark-Firewall-SMB/Can-t-in-decrease-DHCP-range-quot-IP-address-is-in-the-range-of/m-p/24195) Post Reply Leaderboard Epsum factorial non deposit quid pro quo hic escorol. | User | Count | | --- | --- | |
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