I can not connect to internet using my cisco router

[Eyobaa]

Dear All

Today i have installed a new 1921 Cisco Router, i wanted 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 isp modem can not do dhcp service

the network is like this

PC (192.168.1.5)  ==> router port 0/1 (192.168.1.1)

isp modem ( ip address:-10.141.54.104, subnet mask:-255.255.255.240 getaway:- 10.141.48.1 )==> router port 0/0 (i dont know)

Using 1541 out of 262136 bytes
!
! Last configuration change at 07:18:02 UTC Wed Jul 18 2018
!
version 15.4
service timestamps debug datetime msec
service timestamps log datetime msec
no service password-encryption
!
hostname Router
!
boot-start-marker
boot-end-marker
!
no aaa new-model
memory-size iomem 25
!
ip dhcp excluded-address 192.168.1.1 255.255.255.0
!
ip dhcp pool Eagle-pool
 import all
 network 192.168.1.0 255.255.255.0
 default-router 192.168.1.1
 dns-server 213.55.96.166
 domain-name Eagle.lan
!
ip cef
no ipv6 cef
multilink bundle-name authenticated
!
cts logging verbose
!
license udi pid CISCO1921/K9 sn FGL211522EF
!
redundancy
!
interface Embedded-Service-Engine0/0
 no ip address
 shutdown
!
interface GigabitEthernet0/0
 ip address 10.141.54.105 255.255.240.0
 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
!
no ip http server
no ip http secure-server
!
ip nat inside source list 1 interface GigabitEthernet0/0 overload
ip route 0.0.0.0 0.0.0.0 10.141.48.1
ip route 0.0.0.0 0.0.0.0 10.141.54.104
!
access-list 100 permit ip 192.168.1.0 0.0.0.255 any
!
control-plane
!
end

Please Help

Thanks!

[chrihussey]

If you connect your PC directly to the ISP modem and give it the 10.141.54.105 255.255.240.0 IP with the gateway being 10.141.48.1 or 10.141.54.104, does it have Internet access? (Make sure you also configure the DNS server).

Thanks

[Eyobaa]

sorry for to late to respond, no sir it don't work but work like this like picture.

[chrihussey · Accepted solution]

That doesn't much much sense that 10.141.54.104 works and .105 won't. It's the same subnet.

Anyhow, if the ISP gave you the .105, then I'd talk to them about it.

Also I noticed a mistake in your configuration. The access list for NAT is incorrect, it should be 100 and not 1:

!

ip nat inside source list 100 interface GigabitEthernet0/0 overload

!

That and remove the "ip route 0.0.0.0 0.0.0.0 10.141.54.104" if 10.141.54.1 is the proper gateway.

Hope this helps.

[Eyobaa]

!
!
!
interface Embedded-Service-Engine0/0
 no ip address
 shutdown
!
interface GigabitEthernet0/0
 ip address 10.141.54.104 255.255.240.0
 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
!
no ip http server
no ip http secure-server
!
ip nat inside source list 100 interface GigabitEthernet0/0 overload
ip route 0.0.0.0 0.0.0.0 10.141.48.1
!
!
!
access-list 100 permit ip 192.168.1.0 0.0.0.255 any
!
control-plane
!
!

Thanks sir everything is worked but,

1.when power goes and come back, the "no shutdown" command disabled it self every time.

2. and then first i can ping from my pc to getaway ip and google.com now i cant.

first everything's worked then when power goes and come nothings working the configuration is stile there. WHY help please

THANkS.

[chrihussey]

Hello,

Glad to hear things are working.

After you made the changes and got it working did you do a "wr mem"?

Can you post the output of "sh ver"?

After the power outage, could the router ping 10.141.54.1, was the interface up?

Thanks

[Eyobaa]

yes i did save the config "copy run start" or "wr mem" but when the power goes and come the interface wont start itsel unti i do "no shut" command to each interface.

here "sh ver"

Cisco IOS Software, C1900 Software (C1900-UNIVERSALK9-M), Version 15.4(3)M3, RELEASE SOFTWARE (fc2)
Technical Support: http://www.cisco.com/techsupport
Copyright (c) 1986-2015 by Cisco Systems, Inc.
Compiled Fri 05-Jun-15 12:31 by prod_rel_team

ROM: System Bootstrap, Version 15.0(1r)M16, RELEASE SOFTWARE (fc1)

Router uptime is 31 minutes
System returned to ROM by power-on
System image file is "usbflash0:c1900-universalk9-mz.SPA.154-3.M3.bin"
Last reload type: Normal Reload
Last reload reason: power-on



This product contains cryptographic features and is subject to United
States and local country laws governing import, export, transfer and
use. Delivery of Cisco cryptographic products does not imply
third-party authority to import, export, distribute or use encryption.
Importers, exporters, distributors and users are responsible for
compliance with U.S. and local country laws. By using this product you
agree to comply with applicable laws and regulations. If you are unable
to comply with U.S. and local laws, return this product immediately.

A summary of U.S. laws governing Cisco cryptographic products may be found at:
http://www.cisco.com/wwl/export/crypto/tool/stqrg.html

If you require further assistance please contact us by sending email to
export@cisco.com.

Cisco CISCO1921/K9 (revision 1.0) with 446464K/77824K bytes of memory.
Processor board ID FGL211522EF
2 Gigabit Ethernet interfaces
1 terminal line
DRAM configuration is 64 bits wide with parity disabled.
255K bytes of non-volatile configuration memory.
245744K bytes of USB Flash usbflash0 (Read/Write)

Technology Package License Information for Module:'c1900'

------------------------------------------------------------------------
Technology    Technology-package                  Technology-package
              Current              Type           Next reboot
------------------------------------------------------------------------
ipbase        ipbasek9             Permanent      ipbasek9
security      None                 None           None
data          None                 None           None
NtwkEss       None                 None           None

Configuration register is 0x2142

Thanks

[chrihussey]

Change the configuration register to 0x2102, then do a "wr mem", then try reloading or power cycling the router and then see if the interfaces come back without having to no shut them.

Regards

[Eyobaa]

How can i change that, i don't no the commands, give me some idea

Thanks Sir

[chrihussey]

!

conf t

!

config-register 0x2102

!

end

!

wr mem

!

[Eyobaa]

Very very Thanks sir for your time and sharing ideas.

Everything is working now on my pc.

but i want to connected to switch, switch model- "sf300-48pp 48 port managed switch"

the switch needs configuration?

Thanks sir.

[chrihussey]

So you want to connect the router to the switch and your PC to the switch. Correct?

I'm not familiar with the SF300s, but if you are only using a single subnet (192.168.1.0/24), then out of the box the SF300 may work for you. I don't think you'll need a crossover cable from the switch to the router as the router has a Gig interface. Suggest just connecting everything and see if it works.

[Eyobaa]

i did that, but it don't work

but i plug my pc to switch and i give the pc ip 192.168.1.3 255.255.255.0 getaway 192.168.1.1 and dns server 213.55.96.166 it works, i think the switch needs dns ip and getaway ip

Thanks

[chrihussey]

So if you give your PC a static IP and it works, but not with DHCP, you probably need to enable "spanning-tree portfast" on the switch ports. As stated earlier, I'm not familiar with that particular switch but the documentation should provide the answer.