01-28-2015 06:52 PM - edited 03-05-2019 12:40 AM
Dear All
Today i have installed a new 1921 Cisco Router, i want to connect my isp modem to one of the gigabit port at the router, and then my pc to the other gigabit port.
i have configured my pc ip statically to be in the same range of the gigabit port 0/1
the isp modem port is in the same range of the gigabit port 0/0
the network is like this
PC (192.168.1.5) ==> router port 0/1 (192.168.1.1)
isp modem (192.168.100.1) ==> router port 0/0 (192.168.100.4)
i have configured the NAT, so my pc now is natted to forward the traffic to port 0/0
after all this, now i can ping the isp modem, and i can even enter the GUI page of the ISP modem, but i dont have internet connection.
from the router, i can ping both far interfaces, and i can even ping google.com or 8.8.8.8 so my router is connected to internet.
i tried to pull out the cable from the router and plugged it directly to the modem and after modifying the ip of the PC, i am able to connect to internet.
maybe i am missing something here, please help me.
the Show IP interface breaf is:
SJ_Router#sh ip in br
Interface IP-Address OK? Method Status Protocol
Embedded-Service-Engine0/0 unassigned YES NVRAM administratively down down
GigabitEthernet0/0 192.168.100.4 YES NVRAM up up
GigabitEthernet0/1 192.168.1.1 YES NVRAM up up
NVI0 192.168.100.4 YES unset up up
this is the sh run-conf print out
!
hostname SJ_Router
!
boot-start-marker
boot-end-marker
!
!
logging buffered 51200 warnings
!
no aaa new-model
!
ip cef
!
!
!
ip dhcp excluded-address 192.168.1.1 192.168.1.10
!
ip dhcp pool "SJM_DHCP_Pool"
!
ip dhcp pool SJM_DHCP_Pool
network 192.168.1.0 255.255.255.0
default-router 192.168.100.1
dns-server 8.8.8.8
!
!
!
ip domain name yourdomain.com
no ipv6 cef
multilink bundle-name authenticated
icense udi pid CISCO1921/K9 sn FGL183123E4
!
!
username SJ_Router privilege 15 secret 5 $1$wqbn$w6fdF34HevDaa8OI0gjYm.
!
!
!
!
!
!
interface Embedded-Service-Engine0/0
no ip address
shutdown
!
interface GigabitEthernet0/0
description $ETH-LAN$$ETH-SW-LAUNCH$$INTF-INFO-GE 0/0$
ip address 192.168.100.4 255.255.255.0
ip nat outside
ip virtual-reassembly in
duplex auto
speed auto
!
interface GigabitEthernet0/1
ip address 192.168.1.1 255.255.255.0
ip nat inside
ip virtual-reassembly in
duplex auto
speed auto
!
ip forward-protocol nd
!
ip http server
ip http access-class 23
ip http authentication local
ip http secure-server
ip http timeout-policy idle 60 life 86400 requests 10000
!
ip nat inside source list 1 interface GigabitEthernet0/0 overload
ip route 0.0.0.0 0.0.0.0 192.168.100.1
!
access-list 1 permit 192.168.1.0 0.0.0.255
Can you please help me with this.
Solved! Go to Solution.
01-29-2015 02:52 AM
Hi again
now i can ping the IPs of the websites but i cant ping the domain names of the websites.
i.e. i can ping 173.194.66.139, and even if i enter this IP in the browser it directs me to google.com
but i can not ping google.com or try to enter google.com from my browser
01-29-2015 02:29 AM
Hi Isgabrillo
yes my pc got an IP which is:
IP: 192.168.1.11
Subnetmask: 255.255.255.0
Default GW: 192.168.1.1
DHCP: 192.168.1.1
DNS: 8.8.8.8
I did ping the 8.8.8.8 and it replies back to me correctly, also the system tray shows that i am connected to internet but i can not ping google.com or even go to google.com by browser
thanks for your help
01-29-2015 12:11 AM
Hi Mohammed,
i think you need to reconfigure the default-gateway on you DHCP pool.
It supposed to be 192.168.1.1.
then retry pinging to google.
If it still failed, you neeed to verify your ip had been translated.
"#show ip nat translation"
01-29-2015 12:43 AM
Crap, didnt see that
Yeah it is your DHCP pool. Your set gateway is wrong, it should be 192.168.1.1
01-29-2015 02:17 AM
Hi Tommy
thanks for your response.
i have changed the default-router to 192.168.1.1
now in my pc the system tray shows that i am connected to internet, but in fact i am not because i tried to ping google.com or do tracert, but there is nothing.
from my PC i tried to ping 8.8.8.8, and yeah it replies
as for the IP Nat translation this is the print-out:
SJ_Router(config)#do sh ip nat translations
Pro Inside global Inside local Outside local Outside global
udp 192.168.100.4:137 192.168.1.11:137 192.168.1.255:137 192.168.1.255:137
udp 192.168.100.4:52215 192.168.1.11:52215 8.8.8.8:53 8.8.8.8:53
udp 192.168.100.4:52216 192.168.1.11:52216 8.8.8.8:53 8.8.8.8:53
udp 192.168.100.4:52217 192.168.1.11:52217 8.8.4.4:53 8.8.4.4:53
udp 192.168.100.4:52992 192.168.1.11:52992 8.8.8.8:53 8.8.8.8:53
udp 192.168.100.4:52994 192.168.1.11:52994 8.8.8.8:53 8.8.8.8:53
udp 192.168.100.4:53869 192.168.1.11:53869 8.8.8.8:53 8.8.8.8:53
udp 192.168.100.4:54611 192.168.1.11:54611 8.8.8.8:53 8.8.8.8:53
udp 192.168.100.4:55964 192.168.1.11:55964 8.8.8.8:53 8.8.8.8:53
udp 192.168.100.4:55965 192.168.1.11:55965 8.8.8.8:53 8.8.8.8:53
udp 192.168.100.4:55966 192.168.1.11:55966 8.8.4.4:53 8.8.4.4:53
udp 192.168.100.4:56039 192.168.1.11:56039 8.8.8.8:53 8.8.8.8:53
udp 192.168.100.4:58705 192.168.1.11:58705 8.8.8.8:53 8.8.8.8:53
udp 192.168.100.4:60304 192.168.1.11:60304 8.8.8.8:53 8.8.8.8:53
udp 192.168.100.4:60305 192.168.1.11:60305 8.8.8.8:53 8.8.8.8:53
udp 192.168.100.4:60306 192.168.1.11:60306 8.8.4.4:53 8.8.4.4:53
udp 192.168.100.4:60558 192.168.1.11:60558 8.8.8.8:53 8.8.8.8:53
udp 192.168.100.4:62432 192.168.1.11:62432 8.8.8.8:53 8.8.8.8:53
udp 192.168.100.4:62903 192.168.1.11:62903 8.8.8.8:53 8.8.8.8:53
udp 192.168.100.4:64574 192.168.1.11:64574 8.8.8.8:53 8.8.8.8:53
any other ideas please
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