# IP addressing. Interface: Connection between host, router and physical link. IP address: 32-bit identifier for host, router interface

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1 IP addressing IP address: 32-bit identifier for host, router interface Interface: Connection between host, router and physical link routers typically have multiple interfaces host may have multiple interfaces IP addresses associated with interface, not host, router =

2 IP addressing (2) IP address: Network part (high order bits) Host part (low order bits) What s a network? (from IP address perspective) Device interfaces with same network part of IP address Can physically reach each other without intervening router LAN Network consisting of 3 IP networks (for IP addresses starting with 223, first 24 bits are network address) 2

3 IP addressing (3) How to find the networks? Detach each interface from router, host Create islands of isolated networks Interconnected system consisting of six networks

4 IP networks: Subnets Sub divide address space network part host address Address format: a.b.c.d/x, where x is # bits in subnet portion of address subnet part /24 host part 4

5 Fixed subnetting (classful) class A B C D 0 network host 10 network host 110 network host 1110 multicast address 32 bits to to to to

6 Address management Problem: We are running out of networks Solution (a): Subnetting: E.g., Class B Host field (16 bits) is subdivided into <subnet;host> fields Solution (b): CIDR (Classless Inter Domain Routing) 6

7 CIDR CIDR: Classless InterDomain Routing Motivation Class A is too large, Class C is too small Everyone had a Class B address!!! Solution: Sites are given contiguous blocks of class-c addresses (256 addresses each) and a mask or parts of former class A/B networks. 7

8 CIDR (2.) CIDR: Classless InterDomain Routing Subnet portion of address of arbitrary length Address format: a.b.c.d/x, where x is # bits in subnet portion of address subnet part /23 host part 8

9 IP addresses: How to get one? Q: How does host get IP address? Hard-coded by system admin in a file Wintel: Control Panel Network Configuration TCP/IP Properties UNIX: /etc/rc.config DHCP: Dynamic Host Configuration Protocol: dynamically get address from as server Plug-and-play IP / Subnets allocated by provider (RIPE/ARIN/ ) 9

10 Hierarchical address structure Recall: CIDR 18 relevant bits /18 = High order bits form the prefix Once inside the network, can subnet: divide remaining bits Subnet example: / / / /14 Note: picture shows prefix masks, not interface addrs! Forwarding decision: Longest prefix match 10

11 Forwarding vs. routing Forwarding: the process of moving packets from input to output The forwarding table Information in the packet Routing: process by which the forwarding table is built and maintained One or more routing protocols Procedures (algorithms) to convert routing info to forwarding table. (More later ) 11

12 Forwarding with CIDR Packet should be sent toward the interface with the longest matching prefix Advertised address

13 Lookup: Longest prefix match Forwarding table: <Network>/<mask> <next-hop> IP Packets: destination IP address Find next-hop via longest prefix match Example: Forwarding table Packets /24 A /16 C /20 B /28 B /28 A

14 IP addressing: The last word Q: How does an ISP get block of addresses? A: ICANN: Internet Corporation for Assigned Names and Numbers allocates addresses manages DNS assigns domain names, resolves disputes Q: What do I do if I don t have a public address? A: Private IP addresses (RFC 1918) 10/ / /16 Private use only not routable in the Internet 14

15 NAT: Network address translation Motivation: Local network uses just one IP address as far as outside world is concerned: Just one IP address for all devices Not needed range of addresses from ISP 15

16 NAT: Network address translation (2.) rest of Internet local network (e.g., home network) / All datagrams leaving local network have same single source NAT IP address: , different source port numbers Datagrams with source or destination in this network have /24 address for source, destination (as usual) 16

17 NAT: Network address translation (3.) Motivation: Local network uses just one IP address as far as outside world is concerned: Range of addresses not needed from ISP: just one IP address for all devices Can change addresses of devices in local network without notifying outside world Can change ISP without changing addresses of devices in local network Devices inside local net not explicitly addressable, visible by outside world (a security plus). 17

18 NAT: Network address translation (4.) Implementation: NAT router must: Outgoing datagrams: Replace (source IP address, port #) of every outgoing datagram to (NAT IP address, new port #)... remote clients/servers will respond using (NAT IP address, new port #) as destination addr. Remember (in NAT translation table) every (source IP address, port #) to (NAT IP address, new port #) translation pair Incoming datagrams: Replace (NAT IP address, new port #) in dest fields of every incoming datagram with corresponding (source IP address, port #) stored in NAT table 18

19 NAT: Network address translation (5.) 2: NAT router changes datagram source addr from , 3345 to , 5001, updates table 2 NAT translation table WAN side addr LAN side addr , , 3345 S: , 5001 D: , S: , 3345 D: , : host sends datagram to , S: , 80 D: , : Reply arrives dest. address: , 5001 S: , 80 D: , : NAT router changes datagram dest addr from , 5001 to ,

20 NAT: Network address translation (6.) 16-bit port-number field: 60,000 simultaneous connections with a single LANside address! NAT is controversial: Routers should only process up to layer 3 Violates end-to-end argument NAT possibility must be taken into account by app designers, e.g., P2P applications Address shortage should instead be solved by IPv6 20

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