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New IP address despite lease time

Frank Reichenbach

Hello

I became a message that I ran out of the 50 licensed IPs, although I never had that many devices active.

Then I realized that the DHCP server gave out new IP address to some devices without respecting the lease time (86400 as per default), so I think this is a bug.

For example the device with mac address d8:d4:3c:d2:87:b5 got 5 leases throughout one day with 3 different IP addresses:

2021:04:17-09:13:52 fw dhcpd: DHCPOFFER on 192.168.4.156 to d8:d4:3c:d2:87:b5 via eth3
2021:04:17-09:13:52 fw dhcpd: DHCPREQUEST for 192.168.4.156 (192.168.4.253) from d8:d4:3c:d2:87:b5 via eth3
2021:04:17-09:13:52 fw dhcpd: DHCPACK on 192.168.4.156 to d8:d4:3c:d2:87:b5 (STR-DN850 D287B5) via eth3
2021:04:17-10:02:47 fw dhcpd: reuse_lease: lease age 2935 (secs) under 25% threshold, reply with unaltered, existing lease for 192.168.4.156
2021:04:17-10:02:47 fw dhcpd: ICMP Echo reply while lease 192.168.4.156 valid.
2021:04:17-10:02:47 fw dhcpd: Abandoning IP address 192.168.4.156: pinged before offer

2021:04:17-10:02:52 fw dhcpd: DHCPOFFER on 192.168.4.157 to d8:d4:3c:d2:87:b5 via eth3
2021:04:17-10:02:52 fw dhcpd: DHCPREQUEST for 192.168.4.157 (192.168.4.253) from d8:d4:3c:d2:87:b5 via eth3
2021:04:17-10:02:52 fw dhcpd: DHCPACK on 192.168.4.157 to d8:d4:3c:d2:87:b5 (STR-DN850 D287B5) via eth3
2021:04:17-10:38:51 fw dhcpd: reuse_lease: lease age 2159 (secs) under 25% threshold, reply with unaltered, existing lease for 192.168.4.157
2021:04:17-10:38:52 fw dhcpd: DHCPOFFER on 192.168.4.157 to d8:d4:3c:d2:87:b5 (STR-DN850 D287B5) via eth3
2021:04:17-10:38:52 fw dhcpd: reuse_lease: lease age 2160 (secs) under 25% threshold, reply with unaltered, existing lease for 192.168.4.157
2021:04:17-10:38:52 fw dhcpd: DHCPREQUEST for 192.168.4.157 (192.168.4.253) from d8:d4:3c:d2:87:b5 (STR-DN850 D287B5) via eth3
2021:04:17-10:38:52 fw dhcpd: DHCPACK on 192.168.4.157 to d8:d4:3c:d2:87:b5 (STR-DN850 D287B5) via eth3

2021:04:17-14:42:58 fw dhcpd: DHCPOFFER on 192.168.4.158 to d8:d4:3c:d2:87:b5 via eth3
2021:04:17-14:42:58 fw dhcpd: DHCPREQUEST for 192.168.4.158 (192.168.4.253) from d8:d4:3c:d2:87:b5 via eth3
2021:04:17-14:42:58 fw dhcpd: DHCPACK on 192.168.4.158 to d8:d4:3c:d2:87:b5 (STR-DN850 D287B5) via eth3
2021:04:17-16:46:51 fw dhcpd: reuse_lease: lease age 7433 (secs) under 25% threshold, reply with unaltered, existing lease for 192.168.4.158
2021:04:17-16:46:52 fw dhcpd: DHCPOFFER on 192.168.4.158 to d8:d4:3c:d2:87:b5 (STR-DN850 D287B5) via eth3
2021:04:17-16:46:59 fw dhcpd: reuse_lease: lease age 7441 (secs) under 25% threshold, reply with unaltered, existing lease for 192.168.4.158
2021:04:17-16:47:00 fw dhcpd: DHCPOFFER on 192.168.4.158 to d8:d4:3c:d2:87:b5 (STR-DN850 D287B5) via eth3
2021:04:17-16:47:00 fw dhcpd: reuse_lease: lease age 7442 (secs) under 25% threshold, reply with unaltered, existing lease for 192.168.4.158
2021:04:17-16:47:00 fw dhcpd: DHCPREQUEST for 192.168.4.158 (192.168.4.253) from d8:d4:3c:d2:87:b5 (STR-DN850 D287B5) via eth3
2021:04:17-16:47:00 fw dhcpd: DHCPACK on 192.168.4.158 to d8:d4:3c:d2:87:b5 (STR-DN850 D287B5) via eth3

2021:04:17-14:37:54 fw dhcpd: reuse_lease: lease age 16502 (secs) under 25% threshold, reply with unaltered, existing lease for 192.168.4.157
2021:04:17-14:37:55 fw dhcpd: DHCPOFFER on 192.168.4.157 to d8:d4:3c:d2:87:b5 (STR-DN850 D287B5) via eth3
2021:04:17-14:37:55 fw dhcpd: reuse_lease: lease age 16503 (secs) under 25% threshold, reply with unaltered, existing lease for 192.168.4.157
2021:04:17-14:37:55 fw dhcpd: DHCPREQUEST for 192.168.4.157 (192.168.4.253) from d8:d4:3c:d2:87:b5 (STR-DN850 D287B5) via eth3
2021:04:17-14:37:55 fw dhcpd: DHCPACK on 192.168.4.157 to d8:d4:3c:d2:87:b5 (STR-DN850 D287B5) via eth3
2021:04:17-14:42:52 fw dhcpd: reuse_lease: lease age 16800 (secs) under 25% threshold, reply with unaltered, existing lease for 192.168.4.157
2021:04:17-14:42:52 fw dhcpd: ICMP Echo reply while lease 192.168.4.157 valid.
2021:04:17-14:42:52 fw dhcpd: Abandoning IP address 192.168.4.157: pinged before offer

2021:04:17-17:28:26 fw dhcpd: reuse_lease: lease age 9928 (secs) under 25% threshold, reply with unaltered, existing lease for 192.168.4.158
2021:04:17-17:28:27 fw dhcpd: DHCPOFFER on 192.168.4.158 to d8:d4:3c:d2:87:b5 (STR-DN850 D287B5) via eth3
2021:04:17-17:28:27 fw dhcpd: reuse_lease: lease age 9929 (secs) under 25% threshold, reply with unaltered, existing lease for 192.168.4.158
2021:04:17-17:28:27 fw dhcpd: DHCPREQUEST for 192.168.4.158 (192.168.4.253) from d8:d4:3c:d2:87:b5 (STR-DN850 D287B5) via eth3
2021:04:17-17:28:27 fw dhcpd: DHCPACK on 192.168.4.158 to d8:d4:3c:d2:87:b5 (STR-DN850 D287B5) via eth3
2021:04:17-17:56:13 fw dhcpd: reuse_lease: lease age 11595 (secs) under 25% threshold, reply with unaltered, existing lease for 192.168.4.158
2021:04:17-17:56:14 fw dhcpd: DHCPOFFER on 192.168.4.158 to d8:d4:3c:d2:87:b5 (STR-DN850 D287B5) via eth3
2021:04:17-17:56:14 fw dhcpd: reuse_lease: lease age 11596 (secs) under 25% threshold, reply with unaltered, existing lease for 192.168.4.158
2021:04:17-17:56:14 fw dhcpd: DHCPREQUEST for 192.168.4.158 (192.168.4.253) from d8:d4:3c:d2:87:b5 (STR-DN850 D287B5) via eth3
2021:04:17-17:56:14 fw dhcpd: DHCPACK on 192.168.4.158 to d8:d4:3c:d2:87:b5 (STR-DN850 D287B5) via eth3
2021:04:17-19:14:40 fw dhcpd: reuse_lease: lease age 16302 (secs) under 25% threshold, reply with unaltered, existing lease for 192.168.4.158
2021:04:17-19:14:41 fw dhcpd: DHCPOFFER on 192.168.4.158 to d8:d4:3c:d2:87:b5 (STR-DN850 D287B5) via eth3
2021:04:17-19:14:41 fw dhcpd: reuse_lease: lease age 16303 (secs) under 25% threshold, reply with unaltered, existing lease for 192.168.4.158
2021:04:17-19:14:41 fw dhcpd: DHCPREQUEST for 192.168.4.158 (192.168.4.253) from d8:d4:3c:d2:87:b5 (STR-DN850 D287B5) via eth3
2021:04:17-19:14:41 fw dhcpd: DHCPACK on 192.168.4.158 to d8:d4:3c:d2:87:b5 (STR-DN850 D287B5) via eth3
2021:04:17-20:32:54 fw dhcpd: reuse_lease: lease age 20996 (secs) under 25% threshold, reply with unaltered, existing lease for 192.168.4.158
2021:04:17-20:32:54 fw dhcpd: ICMP Echo reply while lease 192.168.4.158 valid.
2021:04:17-20:32:54 fw dhcpd: Abandoning IP address 192.168.4.158: pinged before offer

As this happened everyday this resulted in 28 "active" IPs counting towards the licensed 50.
I now assigned a static IP to this MAC, but I will remain over the 50 IPs for some time now, blocking other devices. Is there a way to have this duplicate IPs removed?



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Parents
  • 0

    Hallo Frank and welcome to the UTM Community!

    What happens if you delete the DHCP server for 192.168.4.x and create a new one - do other devices continue to get different IPs?

    Cheers - Bob

     
    Sophos UTM Community Moderator
    Sophos Certified Architect - UTM
    Sophos Certified Engineer - XG
    Gold Solution Partner since 2005
    MediaSoft, Inc. USA
Reply
  • 0

    Hallo Frank and welcome to the UTM Community!

    What happens if you delete the DHCP server for 192.168.4.x and create a new one - do other devices continue to get different IPs?

    Cheers - Bob

     
    Sophos UTM Community Moderator
    Sophos Certified Architect - UTM
    Sophos Certified Engineer - XG
    Gold Solution Partner since 2005
    MediaSoft, Inc. USA
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