During routine monitoring of a mirrored switch port, you observe hundreds of unsolicited ARP replies in which a single workstation MAC address claims to own the gateway IP as well as several file-server IPs. Which sniffing detection technique would most quickly validate that ARP spoofing is in progress on this segment?
Configure DHCP snooping so untrusted ports cannot hand out address leases.
Deploy arpwatch to log and alert on MAC-to-IP mapping changes within the subnet.
Enable root guard on the access port to block rogue bridge advertisements.
Run an Nmap TCP SYN scan against the suspected workstation to enumerate its open ports.
ARP spoofing can be detected by monitoring the normal one-to-one relationship between IP and MAC addresses on the local segment. A tool such as arpwatch continuously records these bindings and generates an alert whenever a MAC address changes its associated IP or an IP appears with a different MAC. This immediately highlights the multiple, conflicting gateway and server claims seen in the ARP replies. A TCP port scan, root-guard, or DHCP snooping may be useful for other security purposes, but they do not provide real-time correlation of IP-to-MAC changes and therefore are not effective techniques for confirming an ARP poisoning attempt.
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What is ARP spoofing?
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How does arpwatch help detect ARP spoofing?
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Why don’t tools like DHCP snooping or Nmap detect ARP spoofing effectively?
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What is ARP spoofing, and why is it a security concern?
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How does arpwatch detect ARP spoofing on a network?
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Why aren’t TCP SYN scans or DHCP snooping effective against ARP spoofing?
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