Solved: HELP HELP HELP !!!

Waqarahm3d · ‎10-25-2012

I have configured a NAT in my lab environment Static route and all configured can ping 4.2.2.2 from router after NAT can ping same DNS from local host as well. Did trace route worked perfect. NOW THE big issue is i can't access internet :S. i can't browse at all. please guys help me out.

And funny thing i have discoverd is my Skype is connecting but no one services seems to be working at all.

Tried flushing DNS as well

Alessio Andreoli · ‎10-25-2012

Hey,
Did you try to configure helper-address or ip forward udp commands??

Alessio

Sent from Cisco Technical Support iPad App

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cadet alain · ‎10-25-2012

Hi,

ok on PC can you verify the hosts file is ok, if it is then do purge the dns cache: ipconfig/flushdns and try again, if still failing then disable dns cache service of windows and try again.

Post the results.

Regards.

Alain

Don't forget to rate helpful posts.

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ALIAOF_ · ‎10-25-2012

Did you remove the following command yet, "ip route 0.0.0.0 0.0.0.0 FastEthernet0/0"

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ALIAOF_ · ‎10-25-2012

If your WAN interface is setup via DHCP then you do not need that command in there. You use that command when there is a static IP configured on your WAN interface and even in that case your default route would not point to the WAN interface itself instead it will point to the next router.

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ALIAOF_ · ‎10-25-2012

Ok try setting up that DHCP setup on the router instead of the L3 switch. Also you don't need that L3 switch in L3 mode so do you have the "ip default-gateway 172.168.10.1" on it?

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ALIAOF_ · ‎10-25-2012

No 3560 is fine you don't have to connect 2960. Are you able to post the full config's minus the passwords from the router and the switch?

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Waqarahm3d · ‎10-25-2012

Guys this is my first time in cisco forum if i have posted under wrong discussion portal please let me know . and also good directions are always helpful.

Cheers !!

paolo bevilacqua · ‎10-25-2012

You need to post config for others to see what is wrong.

Waqarahm3d · ‎10-25-2012

This is one simple and sweet config i have on router Paolo (Thanks for reply).

!

interface FastEthernet0/0

ip address dhcp

ip nat outside

ip virtual-reassembly

duplex auto

speed auto

!

interface FastEthernet0/1

ip address 172.168.10.1 255.255.255.0

ip nat inside

ip virtual-reassembly

duplex auto

speed auto

!

interface Serial0/0/0

no ip address

shutdown

no fair-queue

clock rate 2000000

!

interface Serial0/0/1

no ip address

shutdown

clock rate 2000000

!

interface Serial0/3/0

no ip address

shutdown

clock rate 2000000

!

interface Serial0/3/1

no ip address

shutdown

clock rate 2000000

!

ip route 0.0.0.0 0.0.0.0 FastEthernet0/0

!

ip http server

no ip http secure-server

ip nat inside source list MSGHQ interface FastEthernet0/0 overload

!

ip access-list standard MSGHQ

permit 172.168.10.0 0.0.0.255

!

control-plane

!

banner motd ^CC

******************************************************************

This L3 is used for Dissertation by Waqar, Please Log off Now !!

******************************************************************^C

!

line con 0

exec-timeout 5 0

password 7 00010B160854180F1924

logging synchronous

login

line aux 0

line vty 0 4

exec-timeout 5 0

password 7 00010B160854180F1924

logging synchronous

login

line vty 5

exec-timeout 5 0

password 7 00010B160854180F1924

logging synchronous

login

line vty 6 14

password 7 104B1109091801021A01

login

line vty 15

login

!

scheduler allocate 20000 1000

!

end

cadet alain · ‎10-25-2012

Hi,

What is the ipconfig of your PC trying to access the internet?

Regards.

Alain

Regards.

Don't forget to rate helpful posts.

Waqarahm3d · ‎10-25-2012

Alain,

i have configured a DHCP on a L3 (Switch)..

Current configuration : 2611 bytes

!

version 12.2

no service pad

service timestamps debug uptime

service timestamps log uptime

service password-encryption

!

hostname MSGSwitch

!

no aaa new-model

system mtu routing 1500

ip subnet-zero

no ip domain-lookup

ip dhcp excluded-address 172.168.10.1 172.168.10.10

ip dhcp excluded-address 172.168.10.250 172.168.10.254

!

ip dhcp pool MSGHQ

network 172.168.10.0 255.255.255.0

default-router 172.168.10.1

domain-name MSGNorthampton.co.uk

dns-server 4.2.2.2

!

no file verify auto

spanning-tree mode pvst

spanning-tree extend system-id

!

vlan internal allocation policy ascending

!

interface FastEthernet0/1

spanning-tree portfast

!

interface FastEthernet0/2

spanning-tree portfast

!

interface FastEthernet0/3

spanning-tree portfast

......

interface GigabitEthernet0/2

!

interface Vlan1

ip address 172.168.10.10 255.255.255.0

!

ip classless

ip http server

!

control-plane

!

banner motd ^CC

******************************************************************

This L3 is used for Dissertation by Waqar, Please Log off Now !!

******************************************************************^C

!

line con 0

exec-timeout 5 0

password 7 00010B160854180F1924

logging synchronous

login

line vty 0 4

exec-timeout 5 0

password 7 00010B160854180F1924

logging synchronous

login

line vty 5

exec-timeout 5 0

password 7 00010B160854180F1924

logging synchronous

login

line vty 6 14

password 7 104B1109091801021A01

login

line vty 15

login

!

end

This is Switch Configuration,

Waqarahm3d · ‎10-25-2012

Waqarahm3d · ‎10-25-2012

C:\Users\Whitewizard>ipconfig /all

Windows IP Configuration

Host Name . . . . . . . . . . . . : Whitewizard-PC

Primary Dns Suffix . . . . . . . :

Node Type . . . . . . . . . . . . : Hybrid

IP Routing Enabled. . . . . . . . : No

WINS Proxy Enabled. . . . . . . . : No

DNS Suffix Search List. . . . . . : MSGNorthampton.co.uk

Ethernet adapter Bluetooth Network Connection:

Media State . . . . . . . . . . . : Media disconnected

Connection-specific DNS Suffix . :

Description . . . . . . . . . . . : Bluetooth Device (Personal Area Netw

Physical Address. . . . . . . . . : AC-72-89-F8-BD-B1

DHCP Enabled. . . . . . . . . . . : Yes

Autoconfiguration Enabled . . . . : Yes

Ethernet adapter Internet:

Connection-specific DNS Suffix . : MSGNorthampton.co.uk

Description . . . . . . . . . . . : Realtek PCIe GBE Family Controller

Physical Address. . . . . . . . . : 08-2E-5F-80-9C-C3

DHCP Enabled. . . . . . . . . . . : Yes

Autoconfiguration Enabled . . . . : Yes

Link-local IPv6 Address . . . . . : fe80::5485:f22d:910b:7ee4%14(Preferr

IPv4 Address. . . . . . . . . . . : 172.168.10.11(Preferred)

Subnet Mask . . . . . . . . . . . : 255.255.255.0

Lease Obtained. . . . . . . . . . : 25 October 2012 14:49:08

Lease Expires . . . . . . . . . . : 26 October 2012 14:49:08

Default Gateway . . . . . . . . . : 172.168.10.1

DHCP Server . . . . . . . . . . . : 172.168.10.10

DHCPv6 IAID . . . . . . . . . . . : 554184287

DHCPv6 Client DUID. . . . . . . . : 00-01-00-01-17-5E-EB-F1-AC-72-89-F8-

DNS Servers . . . . . . . . . . . : 4.2.2.2

NetBIOS over Tcpip. . . . . . . . : Enabled

Wireless LAN adapter Wireless Network Connection:

Media State . . . . . . . . . . . : Media disconnected

Connection-specific DNS Suffix . :

Description . . . . . . . . . . . : Intel(R) Centrino(R) Wireless-N 1030

Physical Address. . . . . . . . . : AC-72-89-F8-BD-AD

DHCP Enabled. . . . . . . . . . . : Yes

Autoconfiguration Enabled . . . . : Yes

Ethernet adapter VMware Network Adapter VMnet1:

Connection-specific DNS Suffix . :

Description . . . . . . . . . . . : VMware Virtual Ethernet Adapter for

1

Physical Address. . . . . . . . . : 00-50-56-C0-00-01

DHCP Enabled. . . . . . . . . . . : No

Autoconfiguration Enabled . . . . : Yes

Link-local IPv6 Address . . . . . : fe80::41b4:a9e8:d7f9:f4e1%43(Preferr

IPv4 Address. . . . . . . . . . . : 192.168.116.1(Preferred)

Subnet Mask . . . . . . . . . . . : 255.255.255.0

Default Gateway . . . . . . . . . :

DHCPv6 IAID . . . . . . . . . . . : 687886422

DHCPv6 Client DUID. . . . . . . . : 00-01-00-01-17-5E-EB-F1-AC-72-89-F8-

DNS Servers . . . . . . . . . . . : fec0:0:0:ffff::1%1

fec0:0:0:ffff::2%1

fec0:0:0:ffff::3%1

NetBIOS over Tcpip. . . . . . . . : Enabled

Ethernet adapter VMware Network Adapter VMnet8:

Connection-specific DNS Suffix . :

Description . . . . . . . . . . . : VMware Virtual Ethernet Adapter for

8

Physical Address. . . . . . . . . : 00-50-56-C0-00-08

DHCP Enabled. . . . . . . . . . . : No

Autoconfiguration Enabled . . . . : Yes

Link-local IPv6 Address . . . . . : fe80::8591:8936:f51:b8e6%44(Preferre

IPv4 Address. . . . . . . . . . . : 192.168.119.1(Preferred)

Subnet Mask . . . . . . . . . . . : 255.255.255.0

Default Gateway . . . . . . . . . :

DHCPv6 IAID . . . . . . . . . . . : 771772502

DHCPv6 Client DUID. . . . . . . . : 00-01-00-01-17-5E-EB-F1-AC-72-89-F8-

DNS Servers . . . . . . . . . . . : fec0:0:0:ffff::1%1

fec0:0:0:ffff::2%1

fec0:0:0:ffff::3%1

NetBIOS over Tcpip. . . . . . . . : Enabled

Tunnel adapter isatap.{17EC9994-C3A9-47FA-85D4-F354C14C9D89}:

Media State . . . . . . . . . . . : Media disconnected

Connection-specific DNS Suffix . :

Description . . . . . . . . . . . : Microsoft ISATAP Adapter

Physical Address. . . . . . . . . : 00-00-00-00-00-00-00-E0

DHCP Enabled. . . . . . . . . . . : No

Autoconfiguration Enabled . . . . : Yes

Tunnel adapter isatap.newton.northampton.ac.uk:

Media State . . . . . . . . . . . : Media disconnected

Connection-specific DNS Suffix . :

Description . . . . . . . . . . . : Microsoft ISATAP Adapter #3

Physical Address. . . . . . . . . : 00-00-00-00-00-00-00-E0

DHCP Enabled. . . . . . . . . . . : No

Autoconfiguration Enabled . . . . : Yes

Tunnel adapter 6TO4 Adapter:

Connection-specific DNS Suffix . : MSGNorthampton.co.uk

Description . . . . . . . . . . . : Microsoft 6to4 Adapter

Physical Address. . . . . . . . . : 00-00-00-00-00-00-00-E0

DHCP Enabled. . . . . . . . . . . : No

Autoconfiguration Enabled . . . . : Yes

IPv6 Address. . . . . . . . . . . : 2002:aca8:a0b::aca8:a0b(Preferred)

Default Gateway . . . . . . . . . :

DNS Servers . . . . . . . . . . . : 4.2.2.2

NetBIOS over Tcpip. . . . . . . . : Disabled

Tunnel adapter isatap.{71139A12-C6A0-403D-81EA-DDDD6E746D6D}:

Media State . . . . . . . . . . . : Media disconnected

Connection-specific DNS Suffix . :

Description . . . . . . . . . . . : Microsoft ISATAP Adapter #4

Physical Address. . . . . . . . . : 00-00-00-00-00-00-00-E0

DHCP Enabled. . . . . . . . . . . : No

Autoconfiguration Enabled . . . . : Yes

Tunnel adapter Teredo Tunneling Pseudo-Interface:

Media State . . . . . . . . . . . : Media disconnected

Connection-specific DNS Suffix . :

Description . . . . . . . . . . . : Teredo Tunneling Pseudo-Interface

Physical Address. . . . . . . . . : 00-00-00-00-00-00-00-E0

DHCP Enabled. . . . . . . . . . . : No

Autoconfiguration Enabled . . . . : Yes

Tunnel adapter isatap.{FF0B4719-983A-4F9A-9383-B602ACC88099}:

Media State . . . . . . . . . . . : Media disconnected

Connection-specific DNS Suffix . :

Description . . . . . . . . . . . : Microsoft ISATAP Adapter #5

Physical Address. . . . . . . . . : 00-00-00-00-00-00-00-E0

DHCP Enabled. . . . . . . . . . . : No

Autoconfiguration Enabled . . . . : Yes

Tunnel adapter isatap.{AFEECE11-122C-446F-B193-4E15A61E2229}:

Media State . . . . . . . . . . . : Media disconnected

Connection-specific DNS Suffix . :

Description . . . . . . . . . . . : Microsoft ISATAP Adapter #6

Physical Address. . . . . . . . . : 00-00-00-00-00-00-00-E0

DHCP Enabled. . . . . . . . . . . : No

Autoconfiguration Enabled . . . . : Yes

cadet alain · ‎10-25-2012

Hi,

I suppose you can ping 8.8.8.8 from this PC ?

Can you also ping www.google.com from this PC ?

Regards.

Alain

Don't forget to rate helpful posts.

Waqarahm3d · ‎10-25-2012

Yes Alain ping to all open DNS works but it's not resolving names, I don't know if it's some sort of issue with DNS configuration which seems to be one but couldn't figure out where to troubleshoot it..

Alessio Andreoli · ‎10-25-2012

Hey,
Did you try to configure helper-address or ip forward udp commands??

Alessio

Sent from Cisco Technical Support iPad App

cadet alain · ‎10-25-2012

Hi,

ok on PC can you verify the hosts file is ok, if it is then do purge the dns cache: ipconfig/flushdns and try again, if still failing then disable dns cache service of windows and try again.

Post the results.

Regards.

Alain

Don't forget to rate helpful posts.

Waqarahm3d · ‎10-25-2012

Alain & Alessio,

Tried everything but didn't worked. I plug in 4 more pcs to same switch and guess what, on one of the pc everthing is working :S.

3 pcs including my laptop Emails and skype working but no browsing . i think i am giving up on this moving on to using another router and switch. I still don't know why this is happening it seem like i have a Gost Switch which only likes to work on pc of it's choice. lol.

ALIAOF_ · ‎10-25-2012

Take this out from your router, "ip route 0.0.0.0 0.0.0.0 FastEthernet0/0". And try again.

(by the way any specific reason you are using a non RFC 1918 IP Range? Why not go with like 172.16.x.x or 192.168.x.x?)

Waqarahm3d · ‎10-25-2012

@Alessio,

Connected 14 more pcs to the same switch and fresh configuration on new swtich and router it's all the same. out of 14 pcs only one is working rest of them are dead.

again ping +traceroute works can access local resources, when it comes to WAN link it's failing.