Cisco Router 2600: can not connect

Posted on 2011-04-21
Last Modified: 2012-05-11

1) I have a lab
2) It is a configuration of the Cisco Router 2600
3) The existing configuration:
- There are Native VLAN (Vlan 1), VLan 10 and Vlan 20
- Please see the attached files
4)The IP of the VLAN 1 is (SM:
- So, This VLan 1 is located at Subnet: -
5) I setup a PC, and give the IP within the above subnet; the setup is as the followings:
- IP address of the PC:
- The SM:
- The Default Gateway: Blank
- The DNS:
6) My Goal: I want to get connection between the PC and the Router (I connect the PC and the Router with the cross-over cable)
7) Problems:
- When I open the Command prompts ...
- I ping the Router --> I ping ...
- It does not work; no connection
8) I attach the existing configuration of the router
9) Any help?
10) Thanks

Question by:tjie
    LVL 79

    Accepted Solution

    Make the physical interface vlan1

     interface Ethernet0/0.1
     encapsulation dot1Q 1 native
     no ip address
    no interface Ethernet0/0.1
    interface Ethernet0/0
    ip address

    Author Comment


    I am not used to with ios command; i just want to make sure that this ones that you mean:

    R1(config)#interface ethernet0/0.1
    R1(config-if)#encapsulation dot1q 1 native
    R1(config-if)#no ip address
    R1(config)#no interface ethernet0/0.1
    R1(config)#interface ethernet0/0
    R1(config-if)#ip address
    R1#copy run start (Does this command to Save the configuration?)

    Post it back again please
    LVL 79

    Expert Comment

    Upon re-reading your existing config, you may want to set this to duplex auto
    R1(config-if)#duplex auto

    The rest of it is OK.

    Author Comment



    1) It is possible that the above configuration does not have "No Shutdown"?
    2) Is it related to Protocol? explain a little bit related to it Please
    3) How to check whether the configuration has got "No Shutdown?"
    4) Thanks

    LVL 79

    Expert Comment

    1) you will not see "no shutdown" in the config
    2) it is related to administratively enabling or disabling the entire port
    3) R1#show ip interface brief
    Here's an example with one interface shutdown and all others "no shut". They should show "up / up"

    Loopback0           YES NVRAM  up                    up
    Loopback1           YES NVRAM  up                    up
    Loopback2           YES NVRAM  administratively down down

    Author Comment


    1) This is starting  to get interesting ..

    2) When i execute the above commands "show ip interface brief"

    3) The results are as the followings:

    Ethernet0/0         unassigned        Yes   NVRAM   UP   UP

    Ethernet0/0.1      Yes   NVRAM   UP   UP

    Ethernet0/0.10      Yes   NVRAM   UP   UP

    Ethernet0/0.20      Yes   NVRAM   UP   UP    

    4) So, if i just follow your direction above, it should work, right? (I mean i could get the connection between the PC and the Router; then, i can copy the flash from the router to the PC with the help of tftp server)

    5 Any other guidance (related to this) is welcome and appreciated

    6) Thank you

    LVL 79

    Expert Comment

    Yes, executing the commands I've posted should get you working.

    Author Comment

    Yes, It works
    Thank you very much

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