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08-24-2016 01:20 AM
08-24-2016 01:20 AM
Reverse IP address in DHCP protection
We enabled DHCP snooping on our Procurve switches some time ago, and on one 2530 switch I see the following entry in the log:
W 08/24/16 09:45:21 02684 dhcp-snoop: backplane: Drop offer from 2.32.42.10 of 10.42.36.215 because the address is already assigned to another client
The DHCP server has IP address 10.42.32.2, and this IP address is listed as an authorized server on all switches, but this switch apparently reverses the IP address. Any ideas why? The switch is running version 16.02.0008
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08-26-2016 09:06 AM
08-26-2016 09:06 AM
Re: Reverse IP address in DHCP protection
Interesting. That's a byte ordering (endianess) issue. I'll get it looked at.
Is it just a display issue in the log and dhcp-snooping functionality is otherwise working? Problem did not exist in the previous version you came from?
Thanks!
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08-29-2016 03:04 AM
08-29-2016 03:04 AM
Re: Reverse IP address in DHCP protection
I have not heard any complaints from the users, so it could be just a display problem. I cannot remember seeing this in previous versions.
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06-27-2017 06:04 AM
06-27-2017 06:04 AM
Re: Reverse IP address in DHCP protection
I have logs showing several entries like this. And on the lastest software on the switches also..