TCP IP Illustrated

TCP IP Illustrated

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Unformatted text preview: = OSPF, 14 = BGP, and others. INTEGER INTEGER Number of seconds since route was last updated or determined to be correct. * Mask to be logically ANDed with destination IP address before being compared with ipRouteDest. IpAddress * IpRouteMask * IpRouteMetrics INTEGER Alternative routing metric. Reference to MIB definitions specific to this particular routing protocol. ObjectID ipRouteInfo Figure 25.23 IP routing table: ipRouteTable. IfIndex Dest 0.0.0.0 127.0.0.1 140.252.1.183 140.252.13.32 140.252.13.65 2 3 2 1 1 NextHop Type Proto Mask 140.252.1.183 127.0.0.1 140.252.1.29 140.252.13.33 140.252.13.35 indirect(4) direct(3) direct(3) direct(3) indirect(4) other(1) other(1) other(1) other(1) other(1) 0.0.0.0 255.255.255.255 255.255.255.255 255.255.0.0 255.255.255.255 Figure 25.24 IP routing table for the router sun. For comparison, here is the IP routing table in the format output by netstat (which we discussed in Section 9.2). Figure 25.24 is lexicographically ordered, unlike the netstat output: sun % netstat -rn Routing tables Destination Gateway Flags 140.252.13.65 140.252.13.35 UGH 127.0.0.1 127.0.0.1 UH 140.252.1.183 140.252.1.29 UH 140.252.1.183 UG default 140.252.13.32 140.252.13.33 U Refcnt 0 1 0 2 8 Use 115 1107 86 1628 68359 Interface le0 lo0 sl0 sl0 le0 The final table in the ip group is the address translation table. Figure 25.25. As we said earlier, the at group is now deprecated, and this IP table replaces it. IP address translation table, index = < ipNetToMedialfIndex >.< ipNetToMediaNetAddress > Name ipNetToMedialfIndex Datatype INTEGER R/W * ipNetfoMediaPhysAddress PhysAddress * Description Corresponding interface: if Index. Physical address. file:///D|/Documents%20and%20Settings/bigini/Doc...omenet2run/tcpip/tcp-ip-illustrated/snmp_sim.htm (21 of 33) [12/09/2001 14.47.40] Chapter 25. SNMP: Simple Network Management Protocol ipNetToMediaNetAddress lpAddress * IP address. ipNetToMediaType [1..4] * Type of mapping: 1 = other, 2 = invalidated, 3 = dynamic, 4 = static. Figure 25.25 IP address translation table: ipNetToMediaTable. Here is the ARP cache on the system sun: sun % arp -a svr4 (140.252.13.34) at 0:0:c0:c2:9b:26 bsdi (140.252.13.35) at 0:0:c0:6f:2d:40 a...
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This test prep was uploaded on 04/04/2014 for the course ECE EL5373 taught by Professor Guoyang during the Spring '12 term at NYU Poly.

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