lec30 - Router/Classifier/Firewall Tables Set of rules(F,A)...

Info iconThis preview shows pages 1–9. Sign up to view the full content.

View Full Document Right Arrow Icon
Router/Classifier/Firewall Tables Set of rules—(F,A) F is a filter Source and destination addresses. Port number and protocol. Time of day. A is an action Drop packet Forward to machine x (next hop). Reserve 10GB/sec bandwidth.
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Example Filters QoS-router filter (source, destination, source port, destination port, protocol) Firewall filter >= 1 field Destination-based packet-forwarding filter Destination address 1-D filter Exactly 1 field – destination address
Background image of page 2
Destination-Address Filters Range [35, 2096] Address/mask pair 101100/011101 Matches 101100, 101110, 001100, 001110. Prefix filter. Mask has 1s at left and 0s at right. 101100/110000 = 10* = [32, 47]. Special case of a range filter.
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Example Router Table P1 = 10* P2 = 111* P3 = 11001* P4 = 1* P5 = 0* P6 = 1000* P7 = 100000* P8 = 1000000* P1 matches all addresses that begin with 10.
Background image of page 4
Tie Breakers First matching rule. Highest-priority rule. Most-specific rule. [2,4] is more specific than [1,6]. [4,14] and [6,16] are not comparable. Longest-prefix rule. Longest matching-prefix.
Background image of page 5

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Longest-Prefix Matching P1 = 10* P2 = 111* P3 = 11001* P4 = 1* P5 = 0* P6 = 1000* P7 = 100000* P8 = 1000000* Destination = 100000000 P1, P4, P6, P7, P8 match this destination P8 is longest matching prefix
Background image of page 6
Static Lookup time. Preprocessing time. Storage requirement. Dynamic Lookup time. Insert a rule. Delete a rule.
Background image of page 7

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Table Size 200,000+ rules Could reach 1M rules soon Prefix up to 32 bits in IPv4 Prefix up to 128 bits in IPv6 OC192, 10Gbps 32 mpps (40-byte packets) Log 2 n schemes make too many memory accesses.
Background image of page 8
Image of page 9
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 12/07/2010 for the course COT 5536 taught by Professor Sartajsahani during the Spring '10 term at University of Florida.

Page1 / 49

lec30 - Router/Classifier/Firewall Tables Set of rules(F,A)...

This preview shows document pages 1 - 9. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online