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Prevent ARP spoofing via packet content ACL, Example Topology, Configuration, bytes

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xStack DES-3800 Series Layer 3 Stackable Fast Ethernet Managed Switch CLI Manual Prevent ARP spoofing via packet content ACL Concerning the common DoS attack today caused by the ARP spoofing, D-Link managed switch can effectively mitigate it via its unique Packet Content ACL. For the reason that basic ACL can only filter ARP packets based on packet type, VLAN ID, Source and Destination MAC information, there is a need for further inspections of ARP packets. To prevent ARP spoofing attacks, we will demonstrate here using the Packet Content ACL on the DES-3800 to block the invalid ARP packets which contain faked gateway's MAC and IP binding. Example Topology Configuration: The design of the Packet Content ACL on the DES-3800 series can inspect any specified content in the first 48 bytes of an ARP packet (up to 80 bytes in total at one time). It utilizes offsets to match individual fields in the Ethernet Frame. An offset contains 16 bytes and each offset is divided into four 4-byte values in a HEX format. (refer to the configuration example below for details ) In addition, the configuration logics are: 1. Only if the ARP matches the Source MAC addresses in Ethernet, Sender's MAC address and Senders IP address in the ARP protocol can it pass through the switch. (In this example, it is gateway's ARP.) 2. The switch will deny all other ARP packets which claim they are from the gateway's IP. When calculating packet offset on DES-3800 series, remember that even though a port is an untagged port, the packet will add additional 4 bytes of 802.1Q header (TCI) for switching internal process, shown in Figure-6. All packets will be added additional 4 bytes to assign PVID for switching internal process. 446

Section	Page
INTRODUCTION	5
Using the Console CLI	7
Command Syntax	11
Basic Switch Commands	13
Switch Port Commands	31
SNMP V3	35
PoE Commands	49
Network Management Commands	54
Switch Utility Commands	62
Network Monitoring Commands	73
Layer 2 FDB Commands	86
Packet Storm Control Commands	94
QoS Commands	98
Mirror Configuration Commands	106
VLAN Commands	109
Link Aggregation Commands	123
IGMP Snooping Commands	127
802.1X Commands (Including Guest VLANs)	135
Access Control List (ACL) Commands	148
Traffic Segmentation Commands	168
Command List History	170
Basic IP Commands (For Layer 3)	173
ARP Commands	178
Routing Table Commands	182
Route Redistribution Commands	185
RIP Commands	191
IGMP Commands	195
Auto Config Commands V3	199
DNS Relay Commands	201
DVMRP Commands	205
IP Multicasting Commands	210
MD5 Commands	213
OSPF Configuration Commands	215
Time and SNTP Commands	232
Port Security Commands	238
MAC Notification Commands	242
SSH Commands	246
Jumbo Frame Commands	254
Access Authentication Control Commands	256
D-Link Single IP Management Commands	279
Multiple Spanning Tree Protocol (MSTP) Commands	289
SSL Commands	301
VRRP Commands	307
System Severity	316
DHCP Relay	318
IP-MAC Binding Commands	324
LACP Configuration Commands	338
CPU Interface Filtering (Software ACL) Commands	340
Modify Prompt and Banner Commands	348
Safeguard Engine	351
WRED Command List	353
Web-based Access Control (WAC) Commands	357
Double VLAN Command List	363
Limited Multicast IP Address Commands	368
Route Preference Commands	373
MAC-Based Access Control Commands	376
PIM Commands	385
Loopback Interface Commands	402
DHCP Server Command List	405
MLD Snooping Commands	421
Loopback Detection Commands	428
Password Recovery Commands	433
Multicast VLAN Commands	436
CPU Filtering Commands List	439
Broadcast Segmentation Commands	441
Technical Specifications	443

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xStack DES-3800 Series Layer 3 Stackable Fast Ethernet Managed Switch CLI Manual

Prevent ARP spoofing via packet content ACL

Concerning the common DoS attack today caused by the ARP spoofing, D-Link managed switch can effectively mitigate it via its

unique Packet Content ACL.

For the reason that basic ACL can only filter ARP packets based on packet type, VLAN ID, Source and Destination MAC

information, there is a need for further inspections of ARP packets. To prevent ARP spoofing attacks, we will demonstrate here using

the Packet Content ACL on the DES-3800 to block the invalid ARP packets which contain faked gateway’s MAC and IP binding.

Example Topology

Configuration:

The design of the Packet Content ACL on the DES-3800 series can inspect any specified content in the first 48 bytes of an ARP

packet (up to 80 bytes in total at one time). It utilizes offsets to match individual fields in the Ethernet Frame. An offset contains 16

bytes and each offset is divided into four 4-byte values in a HEX format. (refer to the configuration example below for details )

In addition, the configuration logics are:

Only if the ARP matches the Source MAC addresses in Ethernet, Sender’s MAC address and Senders IP address in the ARP

protocol can it pass through the switch. (In this example, it is gateway’s ARP.)

The switch will deny all other ARP packets which claim they are from the gateway’s IP.

When calculating packet offset on DES-3800 series, remember that even though a

port is an untagged port, the packet will add additional

4 bytes

of 802.1Q header (TCI)

for switching internal process, shown in Figure-6.

All packets will be added additional 4 bytes to assign PVID for switching internal process.

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