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New Member

Multi iP address leassed for Singale MAC address

Hi All,

The DHCP is running in cisco 3550 and we have upgraded the Desktop from XP to Win 7 , After upgrading the OS win 7 the dhcp is leased multiple IP address to single MAC address and the updated client record as in use, So dhcp pool got full .

Hence other users are not gettign IP address , If removed the win 7 pc from the network , everything started wotrking fine.

cst: %DHCPD-4-DECLINE_CONFLICT: DHCP address conflict:  client 0100.262d.fba2.1a declined

  • WAN Routing and Switching
3 REPLIES
New Member

Multi iP address leassed for Singale MAC address

Internet  *.*.*.137         122   1cc1.de1f.8fe6  ARPA   Vlan
Internet  *.*.*.139         122   1cc1.de1f.8fe6  ARPA   Vlan
Internet  *.*.*.139         142   1cc1.de1f.8fe6  ARPA   Vlan
Internet  *.*.*.142         121   1cc1.de1f.8fe6  ARPA   Vlan
Internet  *.*.*.129         123   1cc1.de1f.8fe6  ARPA   Vlan
Internet  *.*.*.131         122   1cc1.de1f.8fe6  ARPA   Vlan
Internet  *.*.*.133         122   1cc1.de1f.8fe6  ARPA   Vlan
Internet  *.*.*.132         142   1cc1.de1f.8fe6  ARPA   Vlan
Internet  *.*.*.135         122   1cc1.de1f.8fe6  ARPA   Vlan
Internet  *.*.*.152         141   1cc1.de1f.8fe6  ARPA   Vlan
Internet  *.*.*.154         120   1cc1.de1f.8fe6  ARPA   Vlan
Internet  *.*.*.155         141   1cc1.de1f.8fe6  ARPA   Vlan
Internet  *.*.*.157         120   1cc1.de1f.8fe6  ARPA   Vlan
Internet  *.*.*.1*         141   1cc1.de1f.8fe6  ARPA   Vlan
Internet  *.*.*.1*         120   1cc1.de1f.8fe6  ARPA   Vlan
Internet  *.*.*.144         142   1cc1.de1f.8fe6  ARPA   Vlan
Internet  *.*.*.144         121   1cc1.de1f.8fe6  ARPA   Vlan
Internet  *.*.*.145         142   1cc1.de1f.8fe6  ARPA   Vlan
Internet  *.*.*.146         121   1cc1.de1f.8fe6  ARPA   Vlan
Internet  *.*.*.148         141   1cc1.de1f.8fe6  ARPA   Vlan
Internet  *.*.*.148         121   1cc1.de1f.8fe6  ARPA   Vlan
Internet  *.*.*.150         120   1cc1.de1f.8fe6  ARPA   Vlan
Internet  *.*.*.169         119   1cc1.de1f.8fe6  ARPA   Vlan
Internet  *.*.*.171         119   1cc1.de1f.8fe6  ARPA   Vlan
Internet  *.*.*.173         118   1cc1.de1f.8fe6  ARPA   Vlan
Internet  *.*.*.174         140   1cc1.de1f.8fe6  ARPA   Vlan
Internet  *.*.*.161         120   1cc1.de1f.8fe6  ARPA   Vlan
Internet  *.*.*.161         141   1cc1.de1f.8fe6  ARPA   Vlan
Internet  *.*.*.163         119   1cc1.de1f.8fe6  ARPA   Vlan
Internet  *.*.*.163         140   1cc1.de1f.8fe6  ARPA   Vlan
Internet  *.*.*.165         119   1cc1.de1f.8fe6  ARPA   Vlan
Internet  *.*.*.167         119   1cc1.de1f.8fe6  ARPA   Vlan
Internet  *.*.*.166         140   1cc1.de1f.8fe6  ARPA   Vlan
Internet  *.*.*.184         117   1cc1.de1f.8fe6  ARPA   Vlan
Internet  *.*.*.187         117   1cc1.de1f.8fe6  ARPA   Vlan
Internet  *.*.*.186         139   1cc1.de1f.8fe6  ARPA   Vlan
Internet  *.*.*.187         139   1cc1.de1f.8fe6  ARPA   Vlan
Internet  *.*.*.189         117   1cc1.de1f.8fe6  ARPA   Vlan
Internet  *.*.*.190         139   1cc1.de1f.8fe6  ARPA   Vlan
Internet  *.*.*.176         140   1cc1.de1f.8fe6  ARPA   Vlan
Internet  *.*.*.176         118   1cc1.de1f.8fe6  ARPA   Vlan
Internet  *.*.*.179         118   1cc1.de1f.8fe6  ARPA   Vlan
Internet  *.*.*.181         140   1cc1.de1f.8fe6  ARPA   Vlan
Internet  *.*.*.180         118   1cc1.de1f.8fe6  ARPA   Vlan
Internet  *.*.*.182         117   1cc1.de1f.8fe6  ARPA   Vlan
Internet  *.*.*.201         116   1cc1.de1f.8fe6  ARPA   Vlan
Internet  *.*.*.200         138   1cc1.de1f.8fe6  ARPA   Vlan
Internet  *.*.*.203         116   1cc1.de1f.8fe6  ARPA   Vlan
Internet  *.*.*.202         138   1cc1.de1f.8fe6  ARPA   Vlan
Internet  *.*.*.207         115   1cc1.de1f.8fe6  ARPA   Vlan
Internet  *.*.*.206         138   1cc1.de1f.8fe6  ARPA   Vlan
Internet  *.*.*.192         117   1cc1.de1f.8fe6  ARPA   Vlan
Internet  *.*.*.193         139   1cc1.de1f.8fe6  ARPA   Vlan
Internet  *.*.*.194         116   1cc1.de1f.8fe6  ARPA   Vlan
Internet  *.*.*.196         116   1cc1.de1f.8fe6  ARPA   Vlan
Internet  *.*.*.197         138   1cc1.de1f.8fe6  ARPA   Vlan
Internet  *.*.*.199         116   1cc1.de1f.8fe6  ARPA   Vlan
Internet  *.*.*.199         138   1cc1.de1f.8fe6  ARPA   Vlan
Internet  *.*.*.216         137   1cc1.de1f.8fe6  ARPA   Vlan
Internet  *.*.*.218         114   1cc1.de1f.8fe6  ARPA   Vlan
Internet  *.*.*.220         114   1cc1.de1f.8fe6  ARPA   Vlan
Internet  *.*.*.221         136   1cc1.de1f.8fe6  ARPA   Vlan
Internet  *.*.*.208         137   1cc1.de1f.8fe6  ARPA   Vlan
Internet  *.*.*.208         115   1cc1.de1f.8fe6  ARPA   Vlan
Internet  *.*.*.210         115   1cc1.de1f.8fe6  ARPA   Vlan
Internet  *.*.*.211         137   1cc1.de1f.8fe6  ARPA   Vlan
Internet  *.*.*.213         137   1cc1.de1f.8fe6  ARPA   Vlan
Internet  *.*.*.215         115   1cc1.de1f.8fe6  ARPA   Vlan

Purple

Multi iP address leassed for Singale MAC address

Hi,

client 0100.262d.fba2.1a   is getting an offer from the DHCP server but it issues a gratuitous ARP to verify this IP is not already on the network and it receives a reply so it sends a DECLINE to the server so it means the suggested IP for the server was not already assigned( not in its pool and no reply to ping) so it would be worth debugging this issue.

Could you clear the arp cache on the switch, turn on this debugging: debug ip dhcp server packet and also post output of sh run | s dhcp and sh ip dhcp pool and sh ip dhcp server statistic after plugging back the Win 7 machines.

At the same time can you sniff on the Windows 7 machine in promiscuous mode and filter on arp and udp port 67 or udp port 68 and attach capture file.

Regards

Alain

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New Member

Multi iP address leassed for Singale MAC address

What does the windows 7 machines event log say in regards to the conlicting address, it would be nice to see both sides of the story here.

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