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09-01-2015 06:04 PM
09-01-2015 06:04 PM
L3 HP switch not preventing DHCP flooding
Hello everyone,
I've an HP switch (HP 5400zl E5406 ZL - J8697A v2 with firmware K.15.17.0007) that I use as L3 switch to do inter-vlan routing for my LAN network.
Since it's supported, I also configured a DHCP server on it.
For some other firmware errors, I discovered I've two hosts on the network that keep asking new IP addresses to the DHCP server (every 5 seconds). I don't know why, the DHCP start to associate different IPs (at the same time!!) to the same MAC address, without never releasing (before the lease time expires) the addresses.
I've a lease time configured, so I really don't understand why this happens..
My config is the following:
dhcp-server pool "10"
authoritative
default-router "10.1.8.1"
dns-server "192.168.1.1,8.8.8.8"
lease 00:18:00
network 10.1.8.0 255.255.252.0
range 10.1.8.10 10.1.9.255
exit
This is bad, since as soon as I turn on those devices the addresses in the DHCP pool finish in a second.
Count on your help!
Thanks,
Luca
- Tags:
- DHCP