IP IP- . . (primary) , ip address, . IP- .
Ciscol601#configure terminal
Enter configuration commands, one per line. End with CNTL/Z. Ciscol601(config)#interface ethernet 0 Ciscol601(config-if)#ip address 192.168.3.254 255.255.255.0
(secondary), . , , 254
, 300 . , . , IP, . ip address < 1-> secondary.
Ciscol601(config)#interface ethernet 0
Ciscol601(config-if)#ip address 192.168.3.205 255.255.255.0 secondary
EthernetO IP. ( secondary) . , (, ) . show running-config, . Ciscol601#show running-config
interface EthernetO
description connected to Internal LAN - 192.168.3.x ip address 192.168.3.205 255.255.255.0 secondary ip address 192.168.3.254 255.255.255.0
no keepalive
, Cisco ConfigMaker, (. . 2.27). IP... .
. , . , VLSM , ( /30, 255.255.255.252) Cisco IOS, ip unnumbered. , ( ). - , , Frame Relay, ATM . . (, EthernetO).
|
|
, ip unnumbered . SerialO.l ( Frame Relay) .
Cisco805#configure terminal
Enter configuration commands, one per line. End with CNTL/Z. Cisco805(config)finterface serial 0.1 Cisco805(config-subif)#ip unnumbered EthernetO
Cisco ConfigMaker, ip unnumbered. . 2.28 , Frame Relay. , , ip unnumbered , .
. , HDLC, PPP, LAPB Frame Relay, . , Frame Relay -. .25 SMDS. , ping . show interfaces, , , .
CiscolOOB Ishow interfaces serial 0.1
SerialO.l is up. line protocol is up
Hardware is QUICC Serial
Interface is unnumbered. Using address of EthernetO (192.168.6.254)
MTU 1500 bytes, BW 1544 Kbit. DLY 20000 usec. rely 255/255. load 1/255 Encapsulation FRAME-RELAY
ARP
ARP (Address Resolution Protocol) . RFC 826. ARP , IP- . IP-. (address resolution). IP-. , , .
IP, , , (reverse address resolution). Cisco IOS , : ARP, proxy ARP, reverse ARP, RFC 826, 1027 903. , Probe, Hewlett-Packard IEEE-802.3.
|
|
ARP ( ) ARP, , . RARP, , . . , Cisco IOS, , , IP. , RARP, .
: (dynamic mapping). ARP . ARP . , . ARP , IP-, .
ARP, , ARP, . (IP-, ) . , ARP-, . , ARP-. ARP-.
ARP- , . , .
, , , ARP .
, ARP- (OxFFFFFFFFFFFF) . ARP-. ARP- , , Microsoft Windows NT 10 . . , . 10 . ARP ARP-.
, show , . , clear arp-cache, .
Ciscol601>show
Protocol Address Age (min) Hardware Addr Type Interface
Internet 192.168.3.113 16 0090.2751.c4f0 ARPA Ethernet0
Internet 192.168.3.14 3 0090.27e0.041e ARPA Ethernet0
Internet 192.168.3.3 79 0090.271d.c8ee ARPA Ethernet0
Internet 192.168.3.5 9 00a0.c9da.f6f6 ARPA Ethernet0
Internet 192.168.3.4 5 00a0.c928.2d07 ARPA Ethernet0
, timeout, . .
ARP, ARPA. SNAP HP Probe . . , probe, snap. show i nterfaces.
|
|
Ciscol601#show interfaces ethernet 0
Ethernet0 is up. line protocol is up
Hardware is QUICC Ethernet, address is 0010.7bef.4478 (bia 0010.7bef.4478)
Description: connected to Internal LAN - 192.168.3.x
Internet address is 192.168.3.254/24
MTU 1500 bytes. BW 10000 Kbit. DLY 1000 usec. rely 255/255. load 1/255
Encapsulation ARPA. loopback not set, keepalive not set
ARP type: ARPA. ARP Timeout 04:00:00
proxy ARP ( RFC 1027) , , , , . , ARP , , , ARP . , ARP, , . , , no ip proxy-, . show ip interface.
Ciscol601#show ip interface ethernet 0 EthernetO is up. line protocol is up
Internet address is 192.168.3.254/24
Broadcast address is 255.255.255.255
Proxy ARP is enabled
ARP . IP-. , ARP . , , . .
2.29 2.30 , ARP. , , 192.168.3.2 - IP- 192.168.3.12. , IP-, -, 00:00:00:00:00:00. MAC header , Destination, FF:FF:FF:FF:FF:FF .
192.168.3.12 , IP-, . , , ARP, - (. . 2.30).
, - .