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тАО07-23-2010 12:41 AM
тАО07-23-2010 12:41 AM
ARP-protection/DHCP-snooping behaviour questions/logging
Hi all,
I тАШm about to implement some LAN protection measures, like dhcp-snooing and arp-protection.
I have some questions about the behaviour and log-messages of both.
Switches:
- 5406zl with uplink to 3500yl and downlink to 5406zl
o Uplink and downlink are trusted for arp
o Uplink is trusted for DHCP-snooping
- 5406zl with uplink to 5406zl
o Uplink is trusted for arp
o Uplink is trusted for DHCP-snooping
ARP-protection
If a port is тАЬarp-protectedтАЭ
1. A pc/server with a fixed IP-address gets its connection refused. Ping results in:
I 07/22/10 09:22:45 00912 arp-protect: Ceasing bad binding ARP logs for 1m
I 07/22/10 09:22:45 00911 arp-protect: Deny ARP Reply тАШmacтАЩ, тАШipтАЩ port E11, vlan 194
I 07/22/10 09:22:45 00911 arp-protect: Deny ARP Reply тАШmacтАЩ, тАШipтАЩ port E11, vlan 194
2. A pc with a тАШDHCP-address works fine
DHCP-snooping
If authorized DHCP-servers are configured.
1. If a non authorized DHCP-server is connected on a local port ( trusted arp-protect port )
The next log appears:
I 07/23/10 08:32:10 00912 arp-protect: Ceasing bad binding ARP logs for 1m
I 07/23/10 08:32:10 00911 arp-protect: Deny ARP Req тАШmacтАЩ,0.0.0.0 port C20, vlan 194
I 07/23/10 08:32:09 00911 arp-protect: Deny ARP Req тАШmacтАЩ,0.0.0.0 port C20, vlan 194
2. If a non authorized DHCP-server is connected to an uplink switch
W 07/23/10 09:32:22 00855 dhcp-snoop: backplane: Ceasing unauthorized server log
s for 5m
W 07/23/10 09:32:22 00854 dhcp-snoop: backplane: Unauthorized server тАШipтАЩ
2 detected on port E1
3. In both cases no log message appears on the downlink switch
Is this as it should work/log?
Thanx Jaap
I тАШm about to implement some LAN protection measures, like dhcp-snooing and arp-protection.
I have some questions about the behaviour and log-messages of both.
Switches:
- 5406zl with uplink to 3500yl and downlink to 5406zl
o Uplink and downlink are trusted for arp
o Uplink is trusted for DHCP-snooping
- 5406zl with uplink to 5406zl
o Uplink is trusted for arp
o Uplink is trusted for DHCP-snooping
ARP-protection
If a port is тАЬarp-protectedтАЭ
1. A pc/server with a fixed IP-address gets its connection refused. Ping results in:
I 07/22/10 09:22:45 00912 arp-protect: Ceasing bad binding ARP logs for 1m
I 07/22/10 09:22:45 00911 arp-protect: Deny ARP Reply тАШmacтАЩ, тАШipтАЩ port E11, vlan 194
I 07/22/10 09:22:45 00911 arp-protect: Deny ARP Reply тАШmacтАЩ, тАШipтАЩ port E11, vlan 194
2. A pc with a тАШDHCP-address works fine
DHCP-snooping
If authorized DHCP-servers are configured.
1. If a non authorized DHCP-server is connected on a local port ( trusted arp-protect port )
The next log appears:
I 07/23/10 08:32:10 00912 arp-protect: Ceasing bad binding ARP logs for 1m
I 07/23/10 08:32:10 00911 arp-protect: Deny ARP Req тАШmacтАЩ,0.0.0.0 port C20, vlan 194
I 07/23/10 08:32:09 00911 arp-protect: Deny ARP Req тАШmacтАЩ,0.0.0.0 port C20, vlan 194
2. If a non authorized DHCP-server is connected to an uplink switch
W 07/23/10 09:32:22 00855 dhcp-snoop: backplane: Ceasing unauthorized server log
s for 5m
W 07/23/10 09:32:22 00854 dhcp-snoop: backplane: Unauthorized server тАШipтАЩ
2 detected on port E1
3. In both cases no log message appears on the downlink switch
Is this as it should work/log?
Thanx Jaap
2 REPLIES 2
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тАО07-25-2010 03:40 AM
тАО07-25-2010 03:40 AM
Re: ARP-protection/DHCP-snooping behaviour questions/logging
Hi Jaap
Your test setup seem to work pretty much as dfesigned :)
And logs seem to be good.
Your test setup seem to work pretty much as dfesigned :)
And logs seem to be good.
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тАО07-30-2010 04:05 AM
тАО07-30-2010 04:05 AM
Re: ARP-protection/DHCP-snooping behaviour questions/logging
Tore Valberg Jul 25, 2010 11:40:34 GMT
Hi Jaap
Your test setup seem to work pretty much as dfesigned :)
And logs seem to be good.
Hi Jaap
Your test setup seem to work pretty much as dfesigned :)
And logs seem to be good.
The opinions expressed above are the personal opinions of the authors, not of Hewlett Packard Enterprise. By using this site, you accept the Terms of Use and Rules of Participation.
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