04-22-2019 11:47 PM
Hello, There is a Cisco router configured by another IT guy with specified addresses from ISP, now the problem is that the ISP give us new net mask and default gateway addresses, so what i did was changing the following addresses
old ISP address -
ip address: 10.131.61.246
net mask: 255.255.255.252
Default : 10.131.61.245
new ISP address -
ip address: 10.131.61.246
net mask: 255.255.240.0
Default : 10.131.48.1
Old Configuration on router
---------------------------------------------------------------------------------
flow monitor MellaFMon
record netflow ipv4 original-input
exporter MellaFEX
cache timeout active 5
!
ip source-route
ip cef
!
!
!
ip dhcp excluded-address 192.168.1.2 192.168.1.50
ip dhcp excluded-address 192.168.1.0 192.168.1.50
ip dhcp excluded-address 192.168.1.1 192.168.1.50
!
ip dhcp pool 101
network 192.168.1.0 255.255.255.0
default-router 192.168.1.1
dns-server 192.168.1.4 8.8.8.8 4.2.2.2
!
ip dhcp pool WiFi
network 192.168.10.0 255.255.255.0
default-router 192.168.10.1
dns-server 8.8.8.8 4.2.2.2
!
ip dhcp pool LAN
network 192.168.40.0 255.255.255.0
default-router 192.168.40.1
dns-server 192.168.1.4 8.8.8.8 4.2.2.2
!
ip dhcp pool CC-Cam
network 192.168.30.0 255.255.255.0
default-router 192.168.30.1
dns-server 8.8.8.8
!
!
!
interface Embedded-Service-Engine0/0
no ip address
shutdown
!
interface GigabitEthernet0/0
no ip address
ip flow ingress
ip flow egress
duplex auto
speed auto
!
interface GigabitEthernet0/0.10
description Wifi-Vlan-Int
encapsulation dot1Q 10
ip address 192.168.10.1 255.255.255.0
ip flow monitor MellaFMon input
ip flow monitor MellaFMon output
ip nat inside
ip virtual-reassembly in
!
interface GigabitEthernet0/0.20
description Server-VLAN-In
encapsulation dot1Q 1 native
ip address 192.168.1.1 255.255.255.0
ip flow monitor MellaFMon input
ip flow monitor MellaFMon output
ip nat inside
ip virtual-reassembly in
!
interface GigabitEthernet0/0.30
description CC-Camera-Int
encapsulation dot1Q 30
ip address 192.168.30.1 255.255.255.0
ip flow monitor MellaFMon input
ip flow monitor MellaFMon output
!
interface GigabitEthernet0/0.40
description LAN-Int
encapsulation dot1Q 40
ip address 192.168.40.1 255.255.255.0
ip flow monitor MellaFMon input
ip flow monitor MellaFMon output
!
interface GigabitEthernet0/1
ip address 197.156.90.82 255.255.255.248 secondary
ip address 10.131.61.246 255.255.255.252
ip flow monitor MellaFMon input
ip flow monitor MellaFMon output
ip flow ingress
ip flow egress
ip nat outside
ip virtual-reassembly in
duplex auto
speed auto
!
ip forward-protocol nd
!
no ip http server
ip http authentication local
no ip http secure-server
!
ip nat pool Server 197.156.90.85 197.156.90.85 netmask 255.255.255.248
ip nat pool USER 197.156.90.83 197.156.90.83 netmask 255.255.255.248
ip nat pool server 197.156.90.85 197.156.90.85 netmask 255.255.255.248
ip nat pool CC-Cam 197.156.90.86 197.156.90.86 netmask 255.255.255.248
ip nat inside source list 10 pool USER overload
ip nat inside source static 192.168.1.4 197.156.90.84
ip nat inside source static 192.168.1.3 197.156.90.85
ip route 0.0.0.0 0.0.0.0 10.131.61.245
!
access-list 10 permit 192.168.10.0 0.0.0.255
access-list 10 permit 192.168.1.0 0.0.0.255
access-list 20 deny 192.168.1.1
access-list 20 deny 192.168.1.3
access-list 20 deny 192.168.1.4
access-list 20 permit 192.168.1.0 0.0.0.255
!
!
!
!
so what i have changed is :
on interface GigabitEthernet0/1
IP address 10.131.61.246 255.255.240.0
IP route 0.0.0.0 0.0.0.0 10.131.61.245
is there anything i have to change on the configuration ? Thanks!
Solved! Go to Solution.
04-23-2019 12:31 AM
Hi there,
Remove the old primary address from Gi0/1 and also remove the old default route:
! int gi0/1 no ip address 10.131.61.246 255.255.255.252 ip address 10.131.61.246 255.255.240.0 ! no ip route 0.0.0.0 0.0.0.0 10.131.61.245 ip route 0.0.0.0 0.0.0.0 10.131.48.1 !
...the rest of the config is OK to leave.
cheers,
Seb.
04-23-2019 12:31 AM
Hi there,
Remove the old primary address from Gi0/1 and also remove the old default route:
! int gi0/1 no ip address 10.131.61.246 255.255.255.252 ip address 10.131.61.246 255.255.240.0 ! no ip route 0.0.0.0 0.0.0.0 10.131.61.245 ip route 0.0.0.0 0.0.0.0 10.131.48.1 !
...the rest of the config is OK to leave.
cheers,
Seb.
04-23-2019 12:52 AM
Thanks for your reply sir, but the previous configuration is already deleted. let me show you current running config on gi0/1 :
interface GigabitEthernet0/1
ip address 197.156.90.82 255.255.255.248 secondary
ip address 10.131.61.246 255.255.240.0
ip flow monitor MellaFMon input
ip flow monitor MellaFMon output
ip flow ingress
ip flow egress
ip nat outside
ip virtual-reassembly in
duplex auto
speed auto
!
ip forward-protocol nd
!
no ip http server
ip http authentication local
no ip http secure-server
!
ip nat pool Server 197.156.90.85 197.156.90.85 netmask 255.255.255.248
ip nat pool USER 197.156.90.83 197.156.90.83 netmask 255.255.255.248
ip nat pool server 197.156.90.85 197.156.90.85 netmask 255.255.255.248
ip nat pool CC-Cam 197.156.90.86 197.156.90.86 netmask 255.255.255.248
ip nat inside source list 10 pool USER overload
ip nat inside source static 192.168.1.4 197.156.90.84
ip nat inside source static 192.168.1.3 197.156.90.85
ip route 0.0.0.0 0.0.0.0 10.131.48.1
!
access-list 10 permit 192.168.10.0 0.0.0.255
access-list 10 permit 192.168.1.0 0.0.0.255
access-list 20 deny 192.168.1.1
access-list 20 deny 192.168.1.3
access-list 20 deny 192.168.1.4
access-list 20 permit 192.168.1.0 0.0.0.255
!
!
!
!
04-23-2019 03:18 AM
04-23-2019 06:22 AM
Assuming the topology of the network detailed in the 'secondary' configuration (197.156.90.80/29) has not changed the configuration should still work?
Is the NAT configuration still in use? Was it supposed to be used as part of a migration?
cheers,
Seb.
04-23-2019 09:08 AM
Hello,
on a side note, the (presumably public) IP address space given to you looks odd/ 10.131.48.0/20 would give you 4094 hosts. Check if by any chance that should have been 10.131.48.0/28...?
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