Electrical computers and digital processing systems: multicomput – Computer-to-computer session/connection establishing
Reexamination Certificate
2011-08-09
2011-08-09
Lin, Kenny S (Department: 2478)
Electrical computers and digital processing systems: multicomput
Computer-to-computer session/connection establishing
C709S223000
Reexamination Certificate
active
07996537
ABSTRACT:
Illegitimate use of IP addresses is counteracted. A network (1) includes a switch (5) with ports (P1,P2,P3) to subscribers (6,6A) and a port (PN) to a core network (2) with DHCP servers (4, 4a,4b). The switch includes a database (MAC1, MAC2), port numbers (P1, P2)) and VLAN identities (VLAN1, VLAN2) for the subscribers (6, 6A) and the filter has a list over trusted DHCP servers. Initially onlY DHCP messages from the subscribers are allowed. When the subscriber (6) requests (M1, M3) for an IP address it is checked that it is a DHCP message with valid subscriber values (MAC1, P1, VLAN1). A respond (M2, M4) with an allocated IP address (IP1) and lease time interval (T1) is checked to come from a trusted DHCP server. If so, a list in the filter (9) with correct information is dynamically generated (MAC1, P1, VLAN1, IP1, T1). A message (M5) from the subscriber (6) with false IP address is discarded by the filter. Attempts by the subscriber to use false IP address are counted and a warning signal is generated.
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Swedish Patent Office, International Search Report for PCT/SE02/02021, dated Apr. 28, 2003.
Johansson Thomas
Juhl Michael Valentin
Nesz Peter
Burleigh Roger S.
Lin Kenny S
Taha Shaq
Telefonaktiebolaget L M Ericsson (publ)
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