NOTE
PPPのアドレス割り当てはlocal poolかdhcp-pool
R1は自身のIFのアドレス帯とは異なるセグメントからでも割り当ててしまうのか？
DIAGRAM
VERIFICATION
R2のIFを開放してみる
R1#sh ip int b | e una Interface IP-Address OK? Method Status Protocol Serial0/0 10.1.2.1 YES manual up down
R2#sh ip int b | e una
Interface IP-Address OK? Method Status Protocol
R2#
R2#debug ppp nego
PPP protocol negotiation debugging is on
R2#conf t
Enter configuration commands, one per line. End with CNTL/Z.
R2(config)#int s0/0
R2(config-if)#no shut
R2(config-if)#
00:18:30: Se0/0 PPP: Outbound cdp packet dropped
R2(config-if)#
00:18:32: %LINK-3-UPDOWN: Interface Serial0/0, changed state to up
00:18:32: Se0/0 PPP: Using default call direction
00:18:32: Se0/0 PPP: Treating connection as a dedicated line
00:18:32: Se0/0 PPP: Session handle[B7000002] Session id[2]
00:18:32: Se0/0 PPP: Phase is ESTABLISHING, Active Open
00:18:32: Se0/0 LCP: O CONFREQ [Closed] id 2 len 10
00:18:32: Se0/0 LCP: MagicNumber 0x001CF99D (0x0506001CF99D)
00:18:32: Se0/0 LCP: I CONFREQ [REQsent] id 32 len 10
00:18:32: Se0/0 LCP: MagicNumber 0x001D20F9 (0x0506001D20F9)
00:18:32: Se0/0 LCP: O CONFACK [REQsent] id 32 len 10
00:18:32: Se0/0 LCP: MagicNumber 0x001D20F9 (0x0506001D20F9)
00:18:32: Se0/0 LCP: I CONFACK [ACKsent] id 2 len 10
00:18:32: Se0/0 LCP: MagicNumber 0x001CF99D (0x0506001CF99D)
00:18:32: Se0/0 LCP: State is Open
00:18:32: Se0/0 PPP: Phase is FORWARDING, Attempting Forward
00:18:32: Se0/0 PPP: Phase is ESTABLISHING, Finish LCP
00:18:32: Se0/0 PPP: Phase is UP
00:18:32: Se0/0 IPCP: O CONFREQ [Closed] id 1 len 10
00:18:32: Se0/0 IPCP: Address 0.0.0.0 (0x030600000000)
00:18:32: Se0/0 CDPCP: O CONFREQ [Closed] id 1 len 4
00:18:32: Se0/0 PPP: Process pending ncp packets
00:18:32: Se0/0 CDPCP: I CONFREQ [REQsent] id 1 len 4
00:18:32: Se0/0 CDPCP: O CONFACK [REQsent] id 1 len 4
00:18:32: Se0/0 IPCP: I CONFREQ [REQsent] id 1 len 10
00:18:32: Se0/0 IPCP: Address 10.1.2.1 (0x03060A010201)
00:18:32: Se0/0 IPCP: O CONFACK [REQsent] id 1 len 10
00:18:32: Se0/0 IPCP: Address 10.1.2.1 (0x03060A010201)
00:18:32: Se0/0 CDPCP: I CONFACK [ACKsent] id 1 len 4
00:18:32: Se0/0 CDPCP: State is Open
00:18:33: %LINEPROTO-5-UPDOWN: Line protocol on Interface Serial0/0, changed state to up
00:18:34: Se0/0 IPCP: Timeout: State ACKsent
00:18:34: Se0/0 IPCP: O CONFREQ [ACKsent] id 2 len 10
00:18:34: Se0/0 IPCP: Address 0.0.0.0 (0x030600000000)
00:18:34: Se0/0 IPCP: I CONFREQ [ACKsent] id 2 len 10
00:18:34: Se0/0 IPCP: Address 10.1.2.1 (0x03060A010201)
00:18:34: Se0/0 IPCP: O CONFACK [ACKsent] id 2 len 10
00:18:34: Se0/0 IPCP: Address 10.1.2.1 (0x03060A010201)
00:18:34: Se0/0 IPCP: I CONFNAK [ACKsent] id 1 len 10
00:18:34: Se0/0 IPCP: Address 192.168.12.3 (0x0306C0A80C03)
00:18:34: Se0/0 IPCP: ID 1 didn't match 2, discarding packet
00:18:34: Se0/0 IPCP: I CONFNAK [ACKsent] id 2 len 10
00:18:34: Se0/0 IPCP: Address 192.168.12.3 (0x0306C0A80C03)
00:18:34: Se0/0 IPCP: O CONFREQ [ACKsent] id 3 len 10
00:18:34: Se0/0 IPCP: Address 192.168.12.3 (0x0306C0A80C03)
00:18:34: Se0/0 IPCP: I CONFACK [ACKsent] id 3 len 10
00:18:34: Se0/0 IPCP: Address 192.168.12.3 (0x0306C0A80C03)
00:18:34: Se0/0 IPCP: State is Open
00:18:34: Se0/0 IPCP: Install negotiated IP interface address 192.168.12.3
00:18:34: Se0/0 IPCP: Install default route thru 10.1.2.1
00:18:34: Se0/0 IPCP: Install route to 10.1.2.1
R2(config-if)#
R2(config-if)#end
R2#sh ip i
00:18:45: %SYS-5-CONFIG_I: Configured from console by console
R2#sh ip int b | e una
Interface IP-Address OK? Method Status Protocol
Serial0/0 192.168.12.3 YES IPCP up up
R2#
R2#sh ip ro
Codes: C - connected, S - static, R - RIP, M - mobile, B - BGP
D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
E1 - OSPF external type 1, E2 - OSPF external type 2
i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2
ia - IS-IS inter area, * - candidate default, U - per-user static route
o - ODR, P - periodic downloaded static route
Gateway of last resort is 10.1.2.1 to network 0.0.0.0
192.168.12.0/32 is subnetted, 1 subnets
C 192.168.12.3 is directly connected, Serial0/0
10.0.0.0/32 is subnetted, 1 subnets
C 10.1.2.1 is directly connected, Serial0/0
S* 0.0.0.0/0 [1/0] via 10.1.2.1
R2#
Ethernet のDHCPと違って異なるアドレス帯でも払い出せる
CONFIGURATION
hostname R1 ! ip dhcp excluded-address 10.1.2.1 ip dhcp excluded-address 192.168.12.1 ! ip dhcp pool DHCP-POOL-192 network 192.168.12.0 255.255.255.0 default-router 192.168.12.1 ! ip dhcp pool DHCP-POOL-10 network 10.1.2.0 255.255.255.0 default-router 10.1.2.1 ! interface Serial0/0 ip address 10.1.2.1 255.255.255.0 encapsulation ppp peer default ip address dhcp-pool DHCP-POOL-192 no shutdown ! end
hostname R2 ! interface Serial0/0 ip address negotiated encapsulation ppp ppp ipcp route default shutdown ! end
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