DHCP Cisco
2. Dynamic Host Configuration Protocol
NAT/PAT Cisco.
DHCP.
1

, :
- - , NAT inside.
- - , NAT outside.
- , - 192.168.12.2.
- NAT ISP.
- ISP 172.16.1.0 / 24, NAT.
- BGP NAT ISP 192.168.34.0/24.
- , - TCP- 80 192.168.34.3 .
, -. NAT:

, :
- Inside local IP- .
- Inside global IP- 172.16.1.0/24.
- Outside local and global IP- -
, IP- .

, NAT 192.168.34.0 / 24 BGP.

NAT- -, . . IP, NAT, :

IP- -, . IP- - 192.168.23.2, , , ISP , 192.168.23.0 / 24. , 192.168.23.0 / 24 ISP.
, - -, - NAT IP- 172.16.1.0/24. IP :

, IP- NAT ISP:
- ISP IP- , , 192.168.34.0 / 24.
- 192.168.34.0/24 ISP, ARP MAC- -, ARP IP- -.
- - , IP- IP- 172.16.1.
- - ISP , IP- ISP.
- ISP , , , 172.16.1.0 / 24.
- ISP , 172.16.1.0 / 24, IP-.
, ISP. , , !
ISP#debug ip packet 1 IP packet debugging is on for access list 1 ISP#conf t ISP(config)#access-list 1 permit host 192.168.34.4
IP- , IP- -.

, -.

, ISP. , , IP- 172.16.1.1 to...it .
? ISP- 172.16.1.0 /24 . BGP NAT:
NAT(config)#ip route 172.16.1.0 255.255.255.0 null 0 NAT(config)#router bgp 1 NAT(config-router)#network 172.16.1.0 mask 255.255.255.0
, 172.16.1.0 / 24 null0. , , . - BGP.

!
: , , translated .
2

. - DHCP-, - DHCP-. , , IP- ... ?

, DHCP DHCP. .

, DHCP / IP-. ...

, , debug dhcp detail
, , DHCP DHCP.

, . , DHCP- DHCP Discover. , , .
DHCPServer#show ip dhcp pool

show ip dhcp pool
, , DHCP. , DHCP "MYPOOL", 192.168.12.0 / 24. .

show ip dhcp server statistics
, , DHCP. , ... ?

. show ip sockets
, . , ... 67 (DHCP), , DHCP .
DHCPServer(config)#service dhcp
.

- ! , 67, , DHCP .

DHCP , , IP- DHCP ... !
: , , DHCP .
3

. 3 ; DHCP- FastEthernet0/0. DHCP-. , DHCP- , . ip helper , relay. , IP- DHCP

, DHCP. show ip interface brief
.
DHCPClient(config)#interface fastEthernet 0/0 DHCPClient(config-if)#shutdown DHCPClient(config-if)#no shutdown
up down , DHCP Discover.

, DHCP Discover DHCP-. , IP helper, . DHCP , DHCPACK (Acknowledgment). , - ...
DHCPServer#debug ip dhcp server packet
, , .

, DHCP- IP- 192.168.12.2, FastEthernet0/0 . DHCP-, IP-?

, , , IP- 192.168.12.2 .

,

, IP- 192.168.12.2 , IP- . .
DHCPServer(config)#ip route 192.168.12.0 255.255.255.0 192.168.23.2
, .

, IP- DHCP.

"debug ip dhcp server packet"
, DHCP:
- DHCP Discover
- DHCP Offer
- DHCP Request
- DHCP ACK
... !
: IP helper, , DHCP- , , .
3 FHRP Cisco .