While debugging connectivity issues on my recently installed CyberCity ADSL line, I came to suspect the ZyXEL router supplied to me by the ISP.

Erwin kindly offered to lend me a good old Cisco SOHO 77 ADSL router to test with, which meant I had to find out how to actually configure this device for use with CyberCity.

It didn’t take long, though – below my configuration for reference:

• dsl654321 is my CyberCity user name
• 11.22.33.44 is my public IP address
• The example configuration contains a static PAT for all ports to 192.168.0.2

Current configuration : 2137 bytes
!
version 12.3
no service pad
service timestamps debug datetime localtime show-timezone
service timestamps log datetime localtime show-timezone
service password-encryption
!
hostname dsl654321
!
boot-start-marker
boot-end-marker
!
logging buffered 8192 debugging
enable secret 5 **removed**
!
clock timezone CET 1
clock summer-time CEST recurring last Sun Mar 2:00 last Sun Oct 3:00
ip subnet-zero
ip domain lookup source-interface Loopback0
ip name-server 212.242.40.3
ip name-server 212.242.40.51
!
ip dhcp pool soho77
   network 192.168.0.0 255.255.255.0
   dns-server 212.242.40.3 212.242.40.51
   default-router 192.168.0.1
   lease 0 1
!
interface Loopback0
 ip address 192.168.255.1 255.255.255.0
!
interface Tunnel0
 no ip address
!
interface Ethernet0
 ip address 192.168.0.1 255.255.255.0
 ip nat inside
 no keepalive
 no cdp enable
 hold-queue 100 out
!
interface ATM0
 no ip address
 no atm ilmi-keepalive
 dsl operating-mode ansi-dmt
 pvc 0/35
  encapsulation aal5mux ppp dialer
  dialer pool-member 1
!
interface Dialer0
 ip address negotiated
 ip nat outside
 encapsulation ppp
 dialer pool 1
 dialer-group 1
 ppp authentication pap callin
 ppp chap hostname dsl654321
 ppp chap password 7 **removed CyberCity Password**
!
ip nat inside source list 1 interface Dialer0 overload
ip nat inside source static 192.168.0.2 11.22.33.44 extendable
ip classless
ip route 0.0.0.0 0.0.0.0 Dialer0
no ip http server
!
access-list 1 permit 192.168.0.0 0.0.255.255
dialer-list 1 protocol ip permit
no cdp run
snmp-server engineID local 000000090200000427FD16B9
snmp-server community **removed** RO
snmp-server enable traps tty
banner motd ^C
***************************************
*                                     *
*   UNAUTHORISED ACCESS PROHIBITED    *
*                                     *
***************************************
^C
!
line con 0
 exec-timeout 60 0
 password 7 **removed**
 login
 transport output all
 stopbits 1
line vty 0 4
 exec-timeout 60 0
 password 7 **removed**
 login
 transport input all
 transport output all
!
scheduler max-task-time 5000
sntp server 212.242.32.206
end