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address. This behavior can cause a condition called "ARP hijacking", when two hosts with the same IP
address try to send an ARP request to the Brocade device.
Normally ARP hijacking is not a problem because IP assignments are done dynamically; however, in
some cases, ARP hijacking can occur, such as when a configuration allows a router interface to share
the IP address of another router interface. Since multiple VLANs and the router interfaces that are
associated with each of the VLANs share the same IP segment, it is possible for two hosts in two
different VLANs to fight for the same IP address in that segment. ARP filtering using ACLs protects an
IP host record in the ARP table from being overwritten by a hijacking host. Using ACLs to filter ARP
requests checks the source IP address in the received ARP packet. Only packets with the permitted IP
address will be allowed to be to be written in the ARP table; others are dropped.
Configuration considerations for filtering ARP packets
• This feature is available on devices running Layer 3 code. This filtering occurs on the management
processor.
• The feature is available on physical interfaces and virtual routing interfaces. It is supported on the
following physical interface types Ethernet and trunks.
• ACLs used to filter ARP packets on a virtual routing interface can be inherited from a previous
interface if the virtual routing interface is defined as a follower virtual routing interface.
• Only extended ACLs which are with protocol IP only can be used. If any other ACL is used, an error
is displayed.
Configuring ACLs for ARP filtering
To implement the ACL ARP filtering feature, enter commands such as the following.
device(config)# access-list 101 permit ip host 192.168.2.2 any
device(config)# access-list 102 permit ip host 192.168.2.3 any
device(config)# access-list 103 permit ip host 192.168.2.4 any
device(config)# vlan 2
device(config-vlan-2)# tag ethe 1/1 to 1/2
device(config-vlan-2)# router-interface ve 2
device(config-vlan-2)# vlan 3
device(config-vlan-3)# tag ethe 1/1 to 1/2
device(config-vlan-3)#router-int ve 3
device(config-vlan-3)# vlan 4
device(config-vlan-4)# tag ethe 1/1 to 1/2
device(config-vlan-4)# router-int ve 4
device(config-vlan-4)# interface ve 2
device(config-ve-2)# ip access-group 101 in
device(config-ve-2)# ip address 192.168.2.1/24
device(config-ve-2)# ip use-ACL-on-arp 103
device(config-ve-2)# exit
device(config)# interface ve 3
device(config-ve-3)# ip access-group 102 in
device(config-ve-3)# ip follow ve 2
device(config-ve-3)# ip use-ACL-on-arp
device(config-ve-3)# exit
device(config-vlan-4)# interface ve 4
device(config-ve-4)# ip follow ve 2
device(config-ve-4)# ip use-ACL-on-arp
device(config-ve-4)# exit
Syntax: [no] ip use-ACL-on-arp [ access-list-number ]
When the use-ACL-on-arp command is configured, the ARP module checks the source IP address of
the ARP request packets received on the interface. It then applies the specified ACL policies to the
packet. Only the packet with the IP address that the ACL permits will be allowed to be to be written in
the ARP table; those that are not permitted will be dropped.
Configuration considerations for filtering ARP packets
FastIron Ethernet Switch Security Configuration Guide 133
53-1003088-03
- FastIron Ethernet Switch 1
- Contents 3
- 53-1003088-03 10
- Document conventions 13
- Notes, cautions, and warnings 14
- Brocade resources 15
- Getting technical help 15
- Document feedback 16
- About This Document 17
- Security Access 19
- Securing access methods 20
- Remote access restrictions 25
- Restricting Telnet connection 26
- Defining the Telnet idle time 27
- Device management security 30
- Disabling Telnet access 31
- Disabling SNMP access 31
- Disabling TFTP access 31
- Setting a Telnet password 32
- Local user accounts 35
- Enabling user password aging 38
- Configuring password history 38
- Enhanced login lockout 39
- Setting passwords to expire 39
- TACACS and TACACS+ security 42
- TACACS authentication 44
- TACACS+ authorization 45
- TACACS+ accounting 45
- Configuring TACACS 47
- Configuring TACACS+ 47
- Enabling TACACS 48
- Setting the TACACS+ key 49
- Setting the timeout parameter 50
- RADIUS security 58
- RADIUS accounting 59
- AAA operations for RADIUS 59
- Configuring RADIUS 61
- RADIUS server per port 64
- RADIUS parameters 66
- Setting RADIUS over IPv6 67
- RADIUS authorization 69
- SSL security 73
- Authentication-method lists 75
- SSH2 and SCP 81
- Tested SSH2 clients 82
- SSH2 supported features 82
- SSH2 authentication types 83
- Optional SSH parameters 88
- Setting the SSH port number 89
- Displaying SSH information 90
- Secure copy with SSH2 93
- SSH2 client 96
- Enabling SSH2 client 97
- Using SSH2 client 98
- Rule-Based IP ACLs 101
- ACL overview 103
- Types of IP ACLs 104
- ACL IDs and entries 104
- Numbered and named ACLs 105
- Default ACL action 105
- How hardware-based ACLs work 106
- Standard numbered ACL syntax 108
- Standard named ACL syntax 109
- Extended numbered ACL syntax 112
- Extended named ACL syntax 118
- ACL comment text management 123
- Viewing comments in an ACL 124
- ACL logging 126
- Displaying ACL Log Entries 128
- ACLs to filter ARP packets 132
- Clearing the filter count 134
- QoS options for IP ACLs 135
- ACL-based rate limiting 140
- ACL statistics 140
- ACL accounting 141
- Displaying ACL information 143
- Troubleshooting ACLs 144
- Policy-based routing (PBR) 144
- Configuring a PBR policy 145
- Configuring the ACLs 145
- Configuring the route map 147
- Enabling PBR 148
- Setting the next hop 149
- IPv6 ACLs 153
- IPv6 ACL configuration notes 155
- Configuring an IPv6 ACL 156
- Creating an IPv6 ACL 158
- For ICMP 159
- ICMP message configurations 163
- Support for ACL logging 166
- Displaying IPv6 ACLs 168
- 802.1X Port Security 169
- IETF RFC support 170
- Setting the IP MTU size 175
- EAP pass-through support 176
- 802.1X accounting 180
- Setting RADIUS parameters 181
- Supported RADIUS attributes 182
- Re-authenticate a user 183
- Specifying an untagged VLAN 185
- Specifying a tagged VLAN 185
- Disabled strict security mode 188
- Enabling 802.1X port security 191
- Setting the port control 191
- Setting the quiet period 193
- Initializing 802.1X on a port 195
- Displaying 802.1X information 200
- Syntax: show dot1x 201
- Displaying 802.1X statistics 205
- Clearing 802.1X statistics 206
- Sample 802.1X configurations 210
- Point-to-point configuration 211
- Hub configuration 212
- MAC Port Security 217
- Secure MAC movement 219
- On an untagged interface 221
- On a tagged interface 221
- Clearing violation statistics 223
- MAC-based VLANs 227
- Static and dynamic hosts 228
- Dynamic MAC-based VLAN 229
- MAC-based VLAN configuration 231
- RADIUS server 232
- Aging for MAC-based VLAN 233
- For blocked hosts 234
- Globally disabling aging 234
- Displaying the MAC-VLAN table 237
- Clearing MAC-VLAN information 243
- Defining MAC Address Filters 247
- RADIUS authentication 255
- Unauthenticated port behavior 255
- Support for dynamic ACLs 256
- Defining MAC address filters 261
- MAC address or port 275
- MAC addresses 277
- Web Authentication 291
- Using local user databases 296
- Creating static passcodes 300
- Automatic authentication 304
- Specifying trusted ports 305
- Filtering DNS queries 308
- Web authentication pages 310
- Customizing the title bar 315
- Customizing the header 316
- Customizing the text box 316
- Customizing the login button 317
- Customizing the footer 317
- Displaying passcodes 321
- DoS Attack Protection 323
- TCP SYN attacks 326
- TCP security enhancement 327
- Dynamic ARP inspection 331
- About Dynamic ARP Inspection 332
- ARP entries 333
- Displaying the ARP table 335
- DHCP snooping 336
- How DHCP snooping works 337
- Configuring DHCP snooping 339
- Multi-VRF support 341
- DHCP relay agent information 342
- DHCP Option 82 sub-options 344
- DHCP option 82 configuration 345
- IP source guard 349
- DHCPv6 snooping 355
- How DHCPv6 snooping works 356
- Configuring DHCPv6 snooping 357
- IPv6 RA Guard 361
- RA guard policy 362
- Whitelist 362
- Prefix list 362
- Maximum preference 362
- Configuring IPv6 RA guard 363
- Configuring port A: 365
- Configuring port C: 365
- Configuring port B: 365
- Security Commands 367
- 802.1x port security 385
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