static IP on router cisco 1841

[josephfathy]

I have modem router and i configur with static IPs : 41.38.100.218 to 41.38.100.222

Subnet mask : 255.255.255.0

Getway : 41.38.100.217

And i have another's line adsl on the same router but dynamic configuration

I need all step on router 1841

I'm close DHCP from network

[balaji.bandi]

you need to step by steps.

First start with Static IP with ISP and configure NAT make sure it works as expected.

below reference guide :

https://www.cisco.com/c/en/us/support/docs/ip/network-address-translation-nat/13772-12.html

Once all working, you can add ADSL to working link, and decide you like to load balance or use standby link.

[Georg Pauwen]

Hello,

below is a generic sample config. You need to use route maps for the NAT load balancing. Post the configuration of your actual 1841 router and indicate which interfaces are connected to what:

interface FastEthernet0/0
description ISP Uplink
ip address 41.38.100.217 255.255.255
ip nat outside
!
interface FastEthernet0/1
description ADSL Uplink
no ip address
pppoe enable
pppoe-client dial-pool-number 1
!
interface Vlan 1
ip address 192.168.1.1 255.255.255.0
ip nat inside
!
interface Dialer0
ip address dhcp
ip mtu 1492
ip nat outside
encapsulation ppp
ip tcp adjust-mss 1452
dialer pool 1
dialer-group 1
ppp authentication pap callin
ppp chap hostname hostname
ppp chap password password
!
ip route 0.0.0.0 0.0.0.0 FastEthernet0/0
ip route 0.0.0.0 0.0.0.0 Dialer0
!
ip nat pool ISP_POOL 41.38.100.217 41.38.100.222 netmask 255.255.255.0
ip nat inside source route-map ISP_RM pool ISP_POOL overload
ip nat inside source route-map ADSL_RM interface Dialer 0
!
route-map ADSL_RM
match ip address 101
match interface Dialer 0
!
route-map ISP_RM
match ip address 101
match interface FastEthernet0/0
!
access-list 101 permit ip 192.168.1.0 0.0.0.255 any

[paul driver]

Hello

---

@Georg Pauwen wrote:

ip route 0.0.0.0 0.0.0.0 FastEthernet0/0
ip route 0.0.0.0 0.0.0.0 Dialer0

---

Having two default routes with the same admin distance will blackhole half your traffic, Suggest incorporate ip sla with conditional routing with a higher admin distance on the less a preferred default route, If you wish to use both paths at the same time apply some policy based routing