The embodiment of the invention discloses an inter-access information obtaining method and apparatus. The method includes the steps of obtaining a current Ethernet packet from Ethernet packet data flow sent by flow acquisition equipment, obtaining the source IP address and the target IP address of the inter-access information from an IP protocol packet when the current Ethernet packet contains the IP protocol packet, and obtaining the source port and the target port of the inter-access information from a TCP protocol packet when the TCP protocol packet is contained in the IP protocol packet.