Configuring Cisco 837 ethernet ports

[ericwi]

Hi all,

I got this router very cheap recently and I would like to plug this into my network. CAn I ,

1. configure this to be a modem rather as a router?

2. assign IP addresses for all the 4 ports that come with
it?


Thanks

 

[yemaya]

Hi.

This configuration is from one 827-v4 running as a modem:

!
interface Ethernet0
 description *** Internal LAN Interface ***
 ip address 192.168.50.1 255.255.255.0
 ip access-group 102 in
 ip nat inside
 ip tcp adjust-mss 1452
 no ip directed-broadcast
 no ip proxy-arp
 no cdp enable
!
interface ATM0
 no ip address 
 no ip route-cache 
 no ip mroute-cache 
 no atm ilmi-keepalive
 pvc 0/38
 encapsulation aal5mux ppp dialer
 dialer pool-member 1
 !
 bundle-enable
 dsl operating-mode auto
 hold-queue 208 in
!
interface Dialer0
 description *** External WAN Interface ***
 ip address negotiated
 ip accounting access-violations
 ip audit INTERNET-IN in
 ip inspect Firewall out
 ip mtu 1492
 ip access-group 101 in
 no ip redirects
 no ip proxy-arp
 no ip unreachables
 ip nat outside
 encapsulation ppp
 dialer pool 1
 dialer-group 1
 ppp loopback ignore
 ppp reliable-link
 ppp authentication chap callin
 ppp chap hostname "user@ISP.com"==>YOUR INFO
 ppp chap password "password"==>YOUR PASSWORD
 ppp ipcp dns request
 no cdp enable
 exit
!
ip nat inside source list 1 interface Dialer0 overload
ip classless
ip route 0.0.0.0 0.0.0.0 Dialer0
no ip http server
!
!
access-list 1 remark The local LAN.
access-list 1 permit 192.168.50.0 0.0.0.255
!
access-list 101 remark Traffic allowed from Internet 
access-list 101 deny ip 0.0.0.0 0.255.255.255 any
access-list 101 deny ip 10.0.0.0 0.255.255.255 any
access-list 101 deny ip 127.0.0.0 0.255.255.255 any
access-list 101 deny ip 169.254.0.0 0.0.255.255 any
access-list 101 deny ip 172.16.0.0 0.15.255.255 any
access-list 101 deny ip 192.0.2.0 0.0.0.255 any
access-list 101 deny ip 192.168.0.0 0.0.255.255 any
access-list 101 deny ip 198.18.0.0 0.1.255.255 any
access-list 101 deny ip 224.0.0.0 0.15.255.255 any
access-list 101 deny ip any host 255.255.255.255
access-list 101 permit tcp any any eq 1723
access-list 101 permit gre any any
access-list 101 permit icmp any any unreachable
access-list 101 permit icmp any any echo-reply
access-list 101 permit icmp any any packet-too-big
access-list 101 permit icmp any any time-exceeded
access-list 101 permit icmp any any traceroute
access-list 101 permit icmp any any administratively-prohibited
access-list 101 deny icmp any any echo
access-list 101 deny ip any any log
!
access-list 102 remark Traffic allowed from Ethernet
access-list 102 deny   ip host 255.255.255.255 any
access-list 102 deny   ip 127.0.0.0 0.255.255.255 any
access-list 102 permit ip any any
!
dialer-list 1 protocol ip permit

If you want to assign an ip address to the interfaces just add them:

router(config)#int XXXXXXXX
router(config-int)#ip addr xxx.xxx.xxx.xxx xxx.xxx.xxx.xxx -> Mask
router(config-int)#no shut

That's all, after that just post your final configuration without passwords to doble check it.

Hope this help.