Can't setup internet on cisco 2610 router

waqarsarwar · July 2013

hello all, need you help setting up internet

when i put ip dhcp in global mode my router does not pick up any addresss i tried to enter manually but still not luck can any one help me???? I Simply want to ping public DNS 4.2.2.2 right and its not doing it...

Current configuration : 853 bytes
!
version 12.3
service timestamps debug datetime msec
service timestamps log datetime msec
no service password-encryption
!
hostname R3
!
boot-start-marker
boot-end-marker
!
!
no aaa new-model
ip subnet-zero
ip cef
!
!
!
!
!
!
!
!
interface Ethernet0/0
description WAN to R3e0/0
ip address dhcp
half-duplex
!
interface Serial0/0
ip address 192.168.4.1 255.255.255.0
clock rate 2000000
!
router ospf 1
log-adjacency-changes
network 192.168.4.0 0.0.0.255 area 0
!
ip http server
ip classless
ip route 0.0.0.0 0.0.0.0 76.186.32.1
!
!
banner motd ^C
*************************************
THIS IS ROUTER3 FOR PRIVATE NETWORK!!
*************************************

^C
!
line con 0
exec-timeout 0 0
password cisco
login
line aux 0
line vty 0 4
exec-timeout 0 0
password cisco
login
line vty 5 15
exec-timeout 0 0
password cisco
login
!
!
end

bbarrick · July 2013

Don't you need to configure the ip helper-address command to tell the router where to pull the addresses from?

Or are you trying to set up the router as the DHCP server?

DCD · July 2013

First thing is Change E0/0 to full duplex second who is your provider? Third you may what to add a little more to your banner statement.

One more thing if you can edit your post you should pull out the IP route information.

waqarsarwar · July 2013

First of all thx for reply... I'm getting frustrated setting this lab.. I'm not making router DNS server... can you give me information on ip helper command.. I'm following cbt nuggets video.

bbarrick · July 2013

waqarsarwar wrote: »

First of all thx for reply... I'm getting frustrated setting this lab.. I'm not making router DNS server... can you give me information on ip helper command.. I'm following cbt nuggets video.

ip helper-address (address) from what I understand, I'm just now studying this, will forward all DHCP requests to the IP address where the DHCP server resides. So the requests go out to I think it's 255.255.255.255 when the router get's that frame it routes it to the address that services DHCP requests.

waqarsarwar · July 2013

hey bro still no luck man below is my new configuration

R2#show ip int b
Interface IP-Address OK? Method Status Protocol
Ethernet0/0 76.186.40.175 YES manual up up
Serial0/0 192.168.2.2 YES manual up up
R2#ping 76.186.32.1

Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 76.186.32.1, timeout is 2 seconds:
.....
Success rate is 0 percent (0/5)
R2#show run
Building configuration...

Current configuration : 1037 bytes
!
version 12.3
service timestamps debug datetime msec
service timestamps log datetime msec
service password-encryption
!
hostname R2
!
boot-start-marker
boot system flash:c2600-i-mz.123-26.bin
boot-end-marker
!
enable secret 5 $1$INQB$sAr21fiITOsoZTfJit.CV1
!
no aaa new-model
ip subnet-zero
ip cef
!
!
!
ip audit po max-events 100
!
!
!
!
!
interface Ethernet0/0
ip address 76.186.40.175 255.255.224.0
ip helper-address 76.186.40.175
full-duplex
!
interface Serial0/0
ip address 192.168.2.2 255.255.255.0
!
router ospf 1
log-adjacency-changes
network 192.168.2.0 0.0.0.255 area 0
!
ip http server
ip classless
ip route 0.0.0.0 0.0.0.0 76.186.32.1
!
!
banner motd ^C
***************************************
THIS IS ROUTER 2 or PRIVATE NETWORK
***************************************

^C
!
line con 0
exec-timeout 0 0
password 7 110A1016141D
login
line aux 0
password 7 070C285F4D06
login
line vty 0 4
exec-timeout 0 0
password 7 070C285F4D06
login
line vty 5 15
exec-timeout 0 0
password 7 045802150C2E
login
!
!
end

waqarsarwar · July 2013

still no luck man getting dhcp ip address on my router any help would be appreciated

R2#show ip int b
Interface IP-Address OK? Method Status Protocol
Ethernet0/0 76.186.40.175 YES manual up up
Serial0/0 192.168.2.2 YES manual up up
R2#ping 76.186.32.1

Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 76.186.32.1, timeout is 2 seconds:
.....
Success rate is 0 percent (0/5)
R2#show run
Building configuration...

Current configuration : 1037 bytes
!
version 12.3
service timestamps debug datetime msec
service timestamps log datetime msec
service password-encryption
!
hostname R2
!
boot-start-marker
boot system flash:c2600-i-mz.123-26.bin
boot-end-marker
!
enable secret 5 $1$INQB$sAr21fiITOsoZTfJit.CV1
!
no aaa new-model
ip subnet-zero
ip cef
!
!
!
ip audit po max-events 100
!
!
!
!
!
interface Ethernet0/0
ip address 76.186.40.175 255.255.224.0
ip helper-address 76.186.40.175
full-duplex
!
interface Serial0/0
ip address 192.168.2.2 255.255.255.0
!
router ospf 1
log-adjacency-changes
network 192.168.2.0 0.0.0.255 area 0
!
ip http server
ip classless
ip route 0.0.0.0 0.0.0.0 76.186.32.1
!
!
banner motd ^C
***************************************
THIS IS ROUTER 2 or PRIVATE NETWORK
***************************************

^C
!
line con 0
exec-timeout 0 0
password 7 110A1016141D
login
line aux 0
password 7 070C285F4D06
login
line vty 0 4
exec-timeout 0 0
password 7 070C285F4D06
login
line vty 5 15
exec-timeout 0 0
password 7 045802150C2E
login
!
!
end

NetworkVeteran · July 2013

my router does not pick up any addresss

Woah, woah! Your configuration doesn't make any sense given your goal.

interface Ethernet0/0
ip address 76.186.40.175 255.255.224.0
ip helper-address 76.186.40.175
full-duplex

Remove all the above. Ensure E0/0 is connected to your ISP. Then replace E0/0's configuration with the following--

NV config wrote:

Interface Ethernet0/0
ip address dhcp
no shutdown

Now the interface should be up. Do "show ip int br e0/0".

Also, the router should be able to receive an IP address and also to ping whatever Internet server you like. If not, run "debug dhcp". It should look something like the below. Hopefully, your DHCPDiscover will yield a response!

*Mar 1 01:07:17.571: DHCP: allocate request
*Mar 1 01:07:17.571: DHCP: new entry. add to queue, interface FastEthernet0/1
*Mar 1 01:07:17.571: DHCP: SDiscover attempt # 1 for entry:
*Mar 1 01:07:17.575: DHCP: SDiscover: sending 291 byte length DHCP packet
*Mar 1 01:07:17.575: DHCP: SDiscover 291 bytes
*Mar 1 01:07:17.575: B'cast on FastEthernet0/1 interface from 0.0.0.0

If you hit any problems, copy and paste your output to the thread.

NetworkVeteran · July 2013

bbarrick wrote: »

Don't you need to configure the ip helper-address command to tell the router where to pull the addresses from?

If his device is acting as a DHCPClient, he should be broadcasting to obtain an address. It's actually the ISP's router that will act as a DHCP Relay Agent (if necessary) and configure "ip helper-address" to relay his broadcasts to their DHCPServer.

bbarrick · July 2013

Ahh, so ip address dhcp is telling Ethernet0/0 to broadcast out to get it's own ip?

NetworkVeteran · July 2013

bbarrick wrote: »

Ahh, so ip address dhcp is telling Ethernet0/0 to broadcast out to get it's own ip?

Yup!

waqarsarwar · July 2013

NetworkVeteran wrote: »

Woah, woah! Your configuration doesn't make any sense given your goal.

Remove all the above. Ensure E0/0 is connected to your ISP. Then replace E0/0's configuration with the following--

Now the interface should be up. Do "show ip int br e0/0".

Also, the router should be able to receive an IP address and also to ping whatever Internet server you like. If not, run "debug dhcp". It should look something like the below. Hopefully, your DHCPDiscover will yield a response!

If you hit any problems, copy and paste your output to the thread.

hey bro same problem... i did ip address dhcp and did debug dhcp but did not got any status

below is my running config

R2#show ip int b
Interface IP-Address OK? Method Status Protocol
Ethernet0/0 unassigned YES DHCP up up
Serial0/0 192.168.2.2 YES manual up up
R2#show run
Building configuration...

Current configuration : 1002 bytes
!
version 12.3
service timestamps debug datetime msec
service timestamps log datetime msec
service password-encryption
!
hostname R2
!
boot-start-marker
boot system flash:c2600-i-mz.123-26.bin
boot-end-marker
!
enable secret 5 $1$INQB$sAr21fiITOsoZTfJit.CV1
!
no aaa new-model
ip subnet-zero
ip cef
!
!
!
ip audit po max-events 100
!
!
!
!
!
interface Ethernet0/0
ip address dhcp
full-duplex
!
interface Serial0/0
ip address 192.168.2.2 255.255.255.0
!
router ospf 1
log-adjacency-changes
network 192.168.2.0 0.0.0.255 area 0
!
ip http server
ip classless
ip route 0.0.0.0 0.0.0.0 76.186.32.1
!
!

i have attached the image which show my ip address when i hook my modem direct to pc...

need help to get this lab going?

gregorio323 · July 2013

In the debug you did not see any DHCP request go out ? this is a 2610 right? which has a 10Baste-T port.

waqarsarwar · July 2013

gregorio323 wrote: »

In the debug you did not see any DHCP request go out ? set the duplex to auto. this is a 2610 right? which has a 10Baste-T port.

yes its 2610 and thats wht i get

DHCP client activity debugging is on
R2#debug dhcp ?
detail DHCP packet content
<cr>

R2#debug dhcp detail
R2#debug dhcp detail
DHCP client activity debugging is on (detailed)

i didnt get any status? do you know the reasons ?

gregorio323 · July 2013

You may want to see if the MAC is locked to your PC. Maybe try to statically configure the MAC address on the interface and that should work.
try this

interface ethernet0/0
ip address dhcp
mac-address 001b.fc51.f604
no shut

waqarsarwar · July 2013

gregorio323 wrote: »

You may want to see if the MAC is locked to your PC. Maybe try to statically configure the MAC address on the interface and that should work.
try this

interface ethernet0/0
ip address dhcp
mac-address 001b.fc51.f604
no shut

omg thxxxxxxxxxxxxx bunchhhhhhhhhhhhhh alottttttttttt........... i can ping 4.2.2.2 you are a life saver how can i thank you enough times... finally i can start to practice now...

btw how do you find mac-address table on router ?

i did show and then ? but i didnt any optinf or mac address table

once again thxxxxx alot...........

pamccabe · July 2013

You might need to be in enable mode to view the mac-address-table with the show command.

DCD · July 2013

gregorio323 wrote: »

You may want to see if the MAC is locked to your PC. Maybe try to statically configure the MAC address on the interface and that should work.
try this

interface ethernet0/0
ip address dhcp
mac-address 001b.fc51.f604
no shut

My ISP provider locks theirs for an unknown time period as well I had to do that when I had my router connected to my ISP.

waqarsarwar · July 2013

DCD wrote: »

My ISP provider locks theirs for an unknown time period as well I had to do that when I had my router connected to my ISP.

will this have any effect when i setup NAT ? bcz my NAT is not working
here is my config

ip address dhcp
ip nat outside
half-duplex
!
interface Serial0/0
ip address 192.168.2.2 255.255.255.0
ip nat inside
!
router eigrp 10
network 192.168.0.0 0.0.255.255
auto-summary
!
ip nat inside source list NAT_ADDRESSES interface Ethernet0/0 overload
ip http server
ip classless
ip route 0.0.0.0 0.0.0.0 dhcp
!
!
!
ip access-list standard NAT_ADDRESSES
permit 192.168.0.0 0.0.255.255
banner motd ^C

my routes

R2#show ip route
Codes: C - connected, S - static, R - RIP, M - mobile, B - BGP
D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
E1 - OSPF external type 1, E2 - OSPF external type 2
i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2
ia - IS-IS inter area, * - candidate default, U - per-user static route
o - ODR, P - periodic downloaded static route

Gateway of last resort is 76.186.32.1 to network 0.0.0.0

142.254.0.0/32 is subnetted, 1 subnets
S 142.254.131.129 [254/0] via 76.186.32.1, Ethernet0/0
76.0.0.0/19 is subnetted, 1 subnets
C 76.186.32.0 is directly connected, Ethernet0/0
D 192.168.1.0/24 [90/2195456] via 192.168.2.1, 00:43:18, Serial0/0
C 192.168.2.0/24 is directly connected, Serial0/0
S* 0.0.0.0/0 [254/0] via 76.186.32.1

here are some resultss

R2#ping google.com
Translating "google.com"...domain server (209.18.47.61) [OK]

Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 74.125.227.161, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 12/13/16 ms
R2#

my ip route

R2#show ip int b
Interface IP-Address OK? Method Status Protocol
Ethernet0/0 76.186.57.53 YES DHCP up up
Serial0/0 192.168.2.2 YES NVRAM up up

my ping results to other routers

R2#ping 192.168.1.2

Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 192.168.1.2, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 4/4/4 ms
R2#ping 192.168.1.1

Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 192.168.1.1, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 1/3/5 ms

DCD · July 2013

You Nat is correct you just need a default route on your R1 router.

Can't setup internet on cisco 2610 router

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