![]() Find the true ARP response from gateway to get it’s MAC address or getting its MAC from another system or logging on it directly.Catch all ARP replies saying it’s from default gateway, but from different mac address.The filter for this is: arp.duplicate-address-detected Click on the tab Ethernet to get an overview of all the MAC addresses in the capture file. Usually Wireshark show these as duplicate IP address detected for IP of default gateway. Find similar ARP response from some machines telling IP of gateway, but with a different mac address.With PCAP file, fine the Mac address of default gateway. ![]() It uses the Wireshark manufacturer database, which is a list of OUIs and MAC addresses compiled from a number of sources. However, attacker will not see actual data if it’s encrypted such as ssl unless they can get encryption key by some way The Wireshark OUI lookup tool provides an easy way to look up OUIs and other MAC address prefixes.Attacker then forward request to default gateway as usual, but it see all communications between client and default gateway, which clients use to connect to everything on the internet Some operating systems (including Windows 98 and later and Mac OS 8.5 and later) use APIPA to locally assign an IP-address if no DHCP server is available. Client machine will send traffic to gateway by using MAC address of attacker. DHCP is a client/server protocol used to dynamically assign IP-address parameters (and other things) to a DHCP client. ![]() ![]()
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