mini鵝的天地

使用ppp
(config-if)#encapsulation PPP
ex:設定serial0介面使用ppp,且ip為192.72.70.142/24
(config)#int serial 0
(config-if)#encapsulation PPP
(config-if)#ip address 192.72.70.142 255.255.255.0
(config-if)#no shutdown

使用ppp認證
(config-if)#ppp authentication
ps:需以雙方的主機名稱新增user,且password兩邊需設相同
ex:用chap連到對方router的主機名稱,密碼為cisco
taipei(config)#username elan password cisco
taipei(config)#int se0
taipei(config-if)#ppp authentication chap 
elan(config)#username taipei password cisco
elan(config)#int se0
elan(config-if)#ppp authentication chap
ps:若兩邊無法建立連線,極可能是username/password不正確
ps:
先試pap,若不行在試chap,順序可調換
(config-if)#ppp authentication pap chap

啟用ppp compression
(config-if)#compress [predictor|stac]
用軟體方式壓縮,且很耗效能
Compression有stacker(堆疊器)與predictor(預測器)

檢視連結上被丟棄的資料,並預防訊框迴路
(config-if)#ppp quality percentage
Error detection有Quality與Magic Number選項可協助

啟用mutlilink
(config-if)#ppp multilink
Cisco IOS 11.1版後支援,可提供負載平衡

PPP Callback
Cisco IOS 11.1版後支援,Cisco路由器可以作為回覆client或回覆server

(config-if)#ppp ?
pap　　 Set PAP authentication parameters
authentication　　 Set PPP link authentication method

.....

#debug ppp nengotiation
兩邊開始建立連線時,會顯示PPP封包的傳輸狀態,可看ppp相互溝通的情形

#debug ppp authentication
可顯示網路中兩部路由器間所進行的chap,pap認證流程
畫面大致如下
PPP authentication debugging is onSe0 PPP: Phase is AUTHENTICATING by both
Se0 CHAP: 0 CHALLENGE id 112 len 25 from "router3"
Se0 CHAP: I CHALLENGE id 113 len 25 from "router1"
Se0 CHAP: O RESPONSE id 112 len 25 from "router3"
Se0 CHAP: I RESPONSE id 113 len 25 from "router1"
Se0 PPP: Sent CHAP LOGIN Request
Se0 PPP: Received LOGIN Response PASS

#debug ppp packet
顯示PPP的封包被傳送與接收,會顯示低階封包內儲存資料直接傳送的結果