{"id":5914,"date":"2017-01-09T23:40:29","date_gmt":"2017-01-09T23:40:29","guid":{"rendered":"https:\/\/stevepedwards.today\/DebianAdmin\/?p=5914"},"modified":"2017-01-09T23:40:29","modified_gmt":"2017-01-09T23:40:29","slug":"cisco-setup-adsl-connection-wan","status":"publish","type":"post","link":"https:\/\/stevepedwards.today\/DebianAdmin\/cisco-setup-adsl-connection-wan\/","title":{"rendered":"Cisco Setup ADSL Connection (WAN)"},"content":{"rendered":"
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I can't write this Post to WP as I go because I don't have 2 phone lines to use (!!), so I won't have a working internet connection for LAN access via the Cisco until many\u00a0sections\u00a0are set up fully.<\/p>\n

Below, I add the minimum\u00a0needed key sections of the config file that enable WAN connectivity only - logging in to the ISP account and being allocated an IP address only at this point - which is complex to fully understand or explain from bare line levels upwards as it involves layer 1-3 protocols and Cisco CCNA level study - to even partly\u00a0appreciate, let alone how Cisco's commands enable them - such as Point to Point Protocols (PPP), Asynchronous Transfer Mode (ATM), PPPoA (over ATM for telephone circuits) \u00a0PPPoE (over Ethernet e.g. for VDSL routers over cable\/fibre etc.), aal5snap for virtual circuits etc. Look them up on Google. I can't possibly explain all of the settings as mine were taken from various conf files and Cisco examples also.<\/p>\n

There are two main sections to a serial ADSL connection - a \"real\" hardware ATM connector and a \"virtual dialer\" (yes, from dial up modem\/ISDN days) that control the overall process of creating and managing a data circuit over a phone line.<\/p>\n

From my working config, the ATM section has key points to note for YOUR line\/ISP that are in bold and may be understood (or not!)\u00a0in context later. Without much research, it is not possible to understand all of the Cisco command functions and just accept they are or may be needed for required operations to work:<\/p>\n

interface ATM0<\/span>
\n no ip address\u00a0<\/span><\/strong>
\n ip nat outside<\/span><\/strong>
\n ip virtual-reassembly<\/span>
\n logging event atm pvc state<\/span>
\n logging event atm pvc autoppp<\/span>
\n no atm ilmi-keepalive<\/span>
\n dsl operating-mode auto adsl2 adsl2+<\/strong> <\/span>
\n dsl enable-training-log <\/span>
\n!<\/span>
\ninterface ATM0.1 point-to-point<\/span>
\n ip address dhcp<\/span><\/strong>
\n ip nat outside<\/span><\/strong>
\n ip virtual-reassembly<\/span>
\n no snmp trap link-status<\/span>
\n atm route-bridged ip<\/span>
\n atm pppatm link reset<\/span>
\n pvc 0\/38<\/strong> <\/span>
\n encapsulation aal5snap<\/span><\/strong>
\n protocol ppp dialer<\/span><\/strong>
\n dialer pool-member 1<\/span><\/strong>
\n ip addr inarp<\/span>
\n !<\/span><\/p>\n

For the user, a most important thing to know for your country\/ISP is the PVC number (Permanent Virtual Circuit), which for BT in the UK is\u00a00\/38.<\/p>\n

Note the similar features as linux ethernet sub-interfaces are possible also using a decimal point system:<\/p>\n

cisco877# sh interfaces atM 0.?<\/span>
\n<0-4294967295> ATM interface number<\/span><\/p>\n

The section from my working conf that handles dial out settings such as account login details is:<\/p>\n

interface Dialer1<\/span>
\n ip address negotiated previous<\/span><\/strong>
\n ip access-group BLOCKWAN in<\/span><\/strong>
\n ip nat outside<\/span><\/strong>
\n ip nat enable<\/span><\/strong>
\n ip virtual-reassembly<\/span>
\n encapsulation ppp<\/span><\/strong>
\n dialer pool 1<\/span><\/strong>
\n dialer-group 1<\/span><\/strong>
\n autodetect encapsulation ppp<\/span><\/strong>
\n ppp authentication chap pap callin<\/span><\/strong>
\n ppp chap hostname user@plus.net<\/span><\/strong>
\n ppp chap password 7 03174F0E10.....<\/span><\/strong>
\n ppp ipcp wins request<\/span>
\n ppp ipcp mask request<\/span>
\n ppp ipcp route default<\/span>
\n ppp ipcp address accept<\/span><\/p>\n

You can attempt to get the same IP address from your ISP you had at last login:<\/p>\n

ip address negotiated previous<\/span><\/p>\n

cisco877# conf t<\/span><\/p>\n

cisco877(config)# interface dialer 1<\/span><\/p>\n

cisco<\/span>877(config-if)#<\/span> ip address negotiated ?<\/span>
\nprevious<\/strong> IPCP attempts to negotiate previous address assigned<\/span><\/p>\n

Let's input these sections line by line - starting in the relevant interface sub directory - to the unit; save the config then connect it to the phone line and see what happens...note the named\u00a0BLOCKWAN ACL has been applied to the interface but is not yet written in the conf! That's is the next Post.<\/p>\n

cisco877# conf t<\/span><\/p>\n

cisco877(config)# interface dialer 1<\/span><\/p>\n

cisco877(config-if)#\u00a0ip address negotiated previous<\/span>
\nip access-group BLOCKWAN in<\/span>
\n ip nat outside<\/span>
\n ip nat enable<\/span>
\n ip virtual-reassembly<\/span>
\n encapsulation ppp<\/span>
\n dialer pool 1<\/span>
\n dialer-group 1<\/span>
\n autodetect encapsulation ppp<\/span>
\n ppp authentication chap pap callin<\/span>
\n ppp chap hostname user@plus.net<\/span>
\n ppp chap password 7 03174F0E100A244A4210090243<\/span>
\n ppp ipcp wins request<\/span>
\n ppp ipcp mask request<\/span>
\n ppp ipcp route default<\/span>
\n ppp ipcp address accept<\/span><\/p>\n

Now for the ATM sections:<\/p>\n

cisco877(config-if)# exit<\/span><\/p>\n

cisco877(config)#interface ATM0<\/span>
\n ip nat outside<\/span>
\n ip virtual-reassembly<\/span>
\n logging event atm pvc state<\/span>
\n logging event atm pvc autoppp<\/span>
\n no atm ilmi-keepalive<\/span>
\n dsl operating-mode auto adsl2 adsl2+ <\/span>
\n dsl enable-training-log<\/span><\/p>\n

cisco877(config-if)# interface ATM0.1 point-to-point<\/span>
\ncisco877(config-subif)#\u00a0ip address dhcp<\/span>
\n ip nat outside<\/span>
\n ip virtual-reassembly<\/span>
\n no snmp trap link-status<\/span>
\n atm route-bridged ip<\/span>
\n atm pppatm link reset<\/span>
\n pvc 0\/38<\/span>
\nencapsulation aal5snap<\/span>
\n protocol ppp dialer<\/span>
\n dialer pool-member 1<\/span>
\n ip addr inarp<\/span><\/p>\n

cisco877(config-if-atm-vc)# end<\/span><\/p>\n

Save the config:<\/p>\n

cisco877# copy running-config startup-config<\/span><\/p>\n

Destination filename [startup-config]? <\/span>
\nBuilding configuration...<\/span>
\n[OK]<\/span><\/p>\n

 <\/p>\n

AND NOW - For the MOST COMMON CISCO FAULT...!!!<\/strong><\/p>\n

The user forgetting to enable the interfaces!!!<\/strong><\/p>\n

cisco877(config)# interface atM 0\u00a0<\/span><\/p>\n

cisco877(config-if)# no shutdown<\/span><\/strong><\/p>\n

cisco877(config)# interface dialer 1<\/span><\/p>\n

cisco877(config-if)# no shutdown<\/span><\/strong><\/p>\n

Now plug the 877 ADSL port into the phone line, listen for the relays to click and watch for WAN connections:<\/p>\n