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pba
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Feature request : DHCP Snooping with option 82

Tue Sep 26, 2006 9:32 pm

A feature invaluable to any ISP would be DHCP Snooping with option 82 as found in Cisco and AliedTelesyn products :

http://www.cisco.com/en/US/products/hw/ ... 35791.html

http://www.alliedtelesis.com/datasheets ... on%2082%22
 
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Alessio Garavano
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Re: Feature request : DHCP Snooping with option 82

Mon Jul 07, 2008 7:38 am

How to implement and use this option in the MT DHCP-Server?

I think i am having some like Dynamic ARP Inspection or DHCP Snooping...

:? In the Log i can see a lot of ip assignment and deassignment from the same MAC in any seconds and all theses IPs are stay in "busy" status in the leases table.

I need to constantly check the leases table and the Log and do a rule in the bridge filter dropping the access of the MAC.

Have someone this problem?

Thanks and regards!
Alessio Garavano
http://www.isparg.com.ar
 
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Re: Feature request : DHCP Snooping with option 82

Thu Aug 21, 2008 4:00 pm

I have some problem

"ip assigned", after 0,5 second - "ip deassigned" - but in DHCP-SERVER Lease status "busy"

sorry my english so bad.

--------------------
Mikrotik RouterOS v.3.13, Pentum 4 1,8 Ghz, Cpu Load 48%

4 - Vlan, 1 - DHCP-Server per Vlan, Abonents over 250
 
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Chupaka
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Re: Feature request : DHCP Snooping with option 82

Fri Aug 22, 2008 2:26 pm

'busy' means there are already this address in the network, and it cannot be assigned second time at least until the first computer is off =)
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Bishop
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Re: Feature request : DHCP Snooping with option 82

Tue Aug 26, 2008 11:37 am

I know. But in this case involved only one computer. Look carefully at the time

24/08/2008 19:00:00 | dhcp info debug | server-24 assigned 172.31.4.20 to 00:0E:2E:6C:00:00 -> authorized,tested,bound
24/08/2008 19:00:01 | dhcp info debug | server-24 deassigned 172.31.4.20 from 00:0E:2E:6C:00:00 -> busy
24/08/2008 19:00:03 | dhcp info debug | server-24 to 00:0E:2E:6C:00:00 172.31.4.20 address alredy in use

took only three seconds
-----------------------------------
server:
Pentium 4 1700MHz
Mikrotik RouterOS 3.13
License Level 4
Network interface 2
- on Uplink
- on with 4 vlan and 1 dhcp server per vlan

----------------------------------
My DHCP SERVER parametrs
----------------------------------
Name: server-24
Interface: vlan24
Lease Time: 01:00:00
Authoritative: after 2s delay
Bootp Support: Off
Add ARP For Leases: On
Always Broadcast: Off
Use RADIUS : On
----------------------------------
Server-24 work with networks:
172.31.4.0/27
172.31.4.32/27
172.31.4.64/27
172.31.4.96/27
172.31.4.128/27
172.31.4.160/27
172.31.4.192/27
172.31.4.224/27
172.31.5.0/27
172.31.5.32/27
172.31.5.64/27
172.31.5.96/27
172.31.5.128/27
172.31.5.160/27
172.31.5.192/27
172.31.5.224/27
-------------------------------------
Strangely but the problem only in one range addresses 172.31.4.* (in particular addresses - 172.31.4.20, 172.31.4.6, 172.31.4.111, 172.31.4.112, 172.31.4.113, the rest are working normally), all computers in other range 172.31.5.* - work fine.

And yet. The client has two computer, one with ip - 172.31.4.20 ,and with ip 172.31.5.2. At first there was the problem at the second no. If you manually swap MAC-addresses or network card, problem remains, but now at the second computer. So the problem is not in the client computer.

172.31.4.* - Dead Zone?
There are thoughts?

Sorry for my English is not my native language.

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