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  1. system says:

    Hello,

    please help me with IPv6 default route.

    for example:

    Futura(config)#ipv6 route ::/0 fastEthernet 0/0 FE80::CE0A:22FF:FED5:0

    so ::/0 means, any address, where must match 0 bytes.

    Is my example of default route correct?

    Thank you

  2. Hi,

    Using ::/0 for the default route is correct. The :: part means all 0s and the /0 represents the network mask, not the bytes.

    Rene

  3. Please don't mind the config looks a little different. I am using GNS3 at home and at the office I have packet tracer installed. But my configuration is almost indentical and I have the exact same problem. At first I thought it was a packet tracer limitation but I used GNS3 at home and encountered the same problem. Usually when I am doing labs I like to get all my lab exercises working before I move on to another issue. I work a problem until I solve it unless it can't be solved. So I am willing to learn maybe I am missing something and you guys can point me in the right direction.

    So Andrew according to what you ask see below my outputs plus additional details.

    A#show ipv6 int brief
    GigabitEthernet0/0         [up/up]
        FE80::240:BFF:FEEA:9201
        2001:DB8:3C4D:1:240:BFF:FEEA:9201
    
    show run...
    !
    interface GigabitEthernet0/0
     no ip address
     duplex auto
     speed auto
     ipv6 address autoconfig
     ipv6 enable

    -

    A#show ipv6 route
    IPv6 Routing Table - 4 entries
    Codes: C - Connected, L - Local, S - Static, R - RIP, B - BGP
           U - Per-user Static route, M - MIPv6
           I1 - ISIS L1, I2 - ISIS L2, IA - ISIS interarea, IS - ISIS summary
           O - OSPF intra, OI - OSPF inter, OE1 - OSPF ext 1, OE2 - OSPF ext 2
           ON1 - OSPF NSSA ext 1, ON2 - OSPF NSSA ext 2
           D - EIGRP, EX - EIGRP external
    S   ::/0 [1/0]
         via GigabitEthernet0/0, receive
    C   2001:DB8:3C4D:1::/64 [0/0]
         via GigabitEthernet0/0, directly connected
    L   2001:DB8:3C4D:1:240:BFF:FEEA:9201/128 [0/0]
         via GigabitEthernet0/0, receive
    L   FF00::/8 [0/0]
         via Null0, receive

    -

    B#show ipv6 int brief
    GigabitEthernet0/0         [up/up]
        FE80::230:A3FF:FEA1:4201
        2001:DB8:3C4D:1:230:A3FF:FEA1:4201
    
    show run...
    !
    interface GigabitEthernet0/0
     no ip address
     duplex auto
     speed auto
     ipv6 address autoconfig

    -

    B#show ipv6 route
    IPv6 Routing Table - 4 entries
    Codes: C - Connected, L - Local, S - Static, R - RIP, B - BGP
           U - Per-user Static route, M - MIPv6
           I1 - ISIS L1, I2 - ISIS L2, IA - ISIS interarea, IS - ISIS summary
           O - OSPF intra, OI - OSPF inter, OE1 - OSPF ext 1, OE2 - OSPF ext 2
           ON1 - OSPF NSSA ext 1, ON2 - OSPF NSSA ext 2
           D - EIGRP, EX - EIGRP external
    C   2001:DB8:3C4D:1::/64 [0/0]
         via GigabitEthernet0/0, directly connected
    L   2001:DB8:3C4D:1:230:A3FF:FEA1:4201/128 [0/0]
         via GigabitEthernet0/0, receive
    S   2001:DB8:3C4D:2::/64 [1/0]
         via GigabitEthernet0/0, receive
    L   FF00::/8 [0/0]
         via Null0, receive

    -

    C#show ipv6 int brief
    GigabitEthernet0/0         [up/up]
        FE80::201:96FF:FE01:6D01
        2001:DB8:3C4D:1::1
    GigabitEthernet0/1         [up/up]
        FE80::201:96FF:FE01:6D02
        2001:DB8:3C4D:2::1
    
    show run...
    !
    interface GigabitEthernet0/0
     no ip address
     duplex auto
     speed auto
     ipv6 address 2001:DB8:3C4D:1::1/64
     ipv6 enable
    !
    interface GigabitEthernet0/1
     no ip address
     duplex auto
     speed auto
     ipv6 address 2001:DB8:3C4D:2::1/64
     ipv6 enable

    Here my result trying to ping to D.

    B#ping 2001:DB8:3C4D:2:2E0:F7FF:FE42:A001
    
    Type escape sequence to abort.
    Sending 5, 100-byte ICMP Echos to 2001:DB8:3C4D:2:2E0:F7FF:FE42:A001, timeout is 2 seconds:
    .....
    Success rate is 0 percent (0/5)

    Here's trying to ping from B to g0/1 on router C

    B#ping 2001:DB8:3C4D:2::1
    
    Type escape sequence to abort.
    Sending 5, 100-byte ICMP Echos to 2001:DB8:3C4D:2::1, timeout is 2 seconds:
    .....
    Success rate is 0 percent (0/5)

    Here's D config.

    D#show ipv6 int brief
    GigabitEthernet0/0         [up/up]
        FE80::2E0:F7FF:FE42:A001
        2001:DB8:3C4D:2:2E0:F7FF:FE42:A001

    Here's the debug info from router C

    C#*Mar 9 20:04:34.192: ICMPv6-ND: Received NS for 2001:DB8:3C4D:2::1 on GigabitEthernet0/0 from 2001:DB8:3C4D:1:230:A3FF:FEA1:4201
    *Mar 9 20:04:36.194: ICMPv6-ND: Received NS for 2001:DB8:3C4D:2::1 on GigabitEthernet0/0 from 2001:DB8:3C4D:1:230:A3FF:FEA1:4201
    *Mar 9 20:04:38.195: ICMPv6-ND: Received NS for 2001:DB8:3C4D:2::1 on GigabitEthernet0/0 from 2001:DB8:3C4D:1:230:A3FF:FEA1:4201
    *Mar 9 20:04:40.544: ICMPv6-ND: Received NS for 2001:DB8:3C4D:2::1 on GigabitEthernet0/0 from 2001:DB8:3C4D:1:230:A3FF:FEA1:4201
    *Mar 9 20:04:42.550: ICMPv6-ND: Received NS for 2001:DB8:3C4D:2::1 on GigabitEthernet0/0 from 2001:DB8:3C4D:1:230:A3FF:FEA1:4201
    *Mar 9 20:04:44.560: ICMPv6-ND: Received NS for 2001:DB8:3C4D:2::1 on GigabitEthernet0/0 from 2001:DB8:3C4D:1:230:A3FF:FEA1:4201

    Similarly Router D trying to ping to Router C's G0/0 interface

    D#ping 2001:DB8:3C4D:1::1
    
    Type escape sequence to abort.
    Sending 5, 100-byte ICMP Echos to 2001:DB8:3C4D:1::1, timeout is 2 seconds:
    .....
    Success rate is 0 percent (0/5)
    
    *Mar 9 20:09:27.955: ICMPv6-ND: Received NS for 2001:DB8:3C4D:1::1 on GigabitEthernet0/1 from 2001:DB8:3C4D:2:2E0:F7FF:FE42:A001
    *Mar 9 20:09:29.954: ICMPv6-ND: Received NS for 2001:DB8:3C4D:1::1 on GigabitEthernet0/1 from 2001:DB8:3C4D:2:2E0:F7FF:FE42:A001
    *Mar 9 20:09:31.956: ICMPv6-ND: Received NS for 2001:DB8:3C4D:1::1 on GigabitEthernet0/1 from 2001:DB8:3C4D:2:2E0:F7FF:FE42:A001
    *Mar 9 20:09:34.317: ICMPv6-ND: Received NS for 2001:DB8:3C4D:1::1 on GigabitEthernet0/1 from 2001:DB8:3C4D:2:2E0:F7FF:FE42:A001
    *Mar 9 20:09:36.320: ICMPv6-ND: Received NS for 2001:DB8:3C4D:1::1 on GigabitEthernet0/1 from 2001:DB8:3C4D:2:2E0:F7FF:FE42:A001
    *Mar 9 20:09:38.332: ICMPv6-ND: Received NS for 2001:DB8:3C4D:1::1 on GigabitEthernet0/1 from 2001:DB8:3C4D:2:2E0:F7FF:FE42:A001
  4. andrew says:

    I built this, and it works perfectly. What version of IOS are you using with GNS3 for this?

    I am noticing some difference in output. For example, my router A for show ipv6 route produces this:

    S   ::/0 [2/0]
         via FE80::C, FastEthernet0/0
    C   2001:DB8:3C4D:1::/64 [0/0]
         via FastEthernet0/0, directly connected
    L   2001:DB8:3C4D:1:C801:29FF:FE78:0/128 [0/0]
         via FastEthernet0/0, receive
    L   FF00::/8 [0/0]
         via Null0, receive

    Notice how for the default static route, mine says "via FE80::C, FastEthernet0/0" where yours just lists the interface. By the way, I hard coded FE80::C on both of Router C's links.

    Let's make this simple and focus on only A, C, and D. Here is the show run I have for all of them:

    A

    !
    upgrade fpd auto
    service timestamps debug datetime msec
    service timestamps log datetime msec
    no service password-encryption
    !
    hostname A
    !
    boot-start-marker
    boot-end-marker
    !
    logging message-counter syslog
    !
    no aaa new-model
    ip source-route
    no ip icmp rate-limit unreachable
    ip cef
    !
    !
    !
    !         
    no ip domain lookup
    no ipv6 cef
    !
    multilink bundle-name authenticated
    !
    !
    !
    !
    !
    !
    !
    !
    !
    !
    !
    !
    !
    !
    !
    !
    archive
     log config
      hidekeys
    ! 
    !
    !
    !
    !
    ip tcp synwait-time 5
    ip ssh version 1
    !
    !
    !
    !
    interface FastEthernet0/0
     no ip address
     duplex half
     ipv6 address autoconfig
     ipv6 enable
    !
    ip forward-protocol nd
    no ip http server
    no ip http secure-server
    !
    !
    !         
    no cdp log mismatch duplex
    !
    !
    !
    !
    !
    !
    control-plane
    !
    !
    !
    !
    !
    !
    !
    gatekeeper
     shutdown
    !
    !
    line con 0
     exec-timeout 0 0
     privilege level 15
     logging synchronous
     stopbits 1
    line aux 0
     exec-timeout 0 0
     privilege level 15
     logging synchronous
     stopbits 1
    line vty 0 4
     login
    !
    end

    C

    upgrade fpd auto
    service timestamps debug datetime msec
    service timestamps log datetime msec
    no service password-encryption
    !
    hostname C
    !
    boot-start-marker
    boot-end-marker
    !
    logging message-counter syslog
    !
    no aaa new-model
    ip source-route
    no ip icmp rate-limit unreachable
    ip cef
    !
    !
    !
    !         
    no ip domain lookup
    ipv6 unicast-routing
    ipv6 cef
    !
    multilink bundle-name authenticated
    !
    !
    !
    !
    !
    !
    !
    !
    !
    !
    !
    !
    !
    !
    !
    !
    archive
     log config
      hidekeys
    ! 
    !
    !
    !
    !
    ip tcp synwait-time 5
    ip ssh version 1
    !
    !
    !
    !
    interface FastEthernet0/0
     no ip address
     duplex auto
     speed auto
     ipv6 address FE80::C link-local
     ipv6 address 2001:DB8:3C4D:1::1/64
     ipv6 enable
    !
    interface FastEthernet0/1
     no ip address
     duplex auto
     speed auto
     ipv6 address FE80::C link-local
     ipv6 address 2001:DB8:3C4D:2::1/64
     ipv6 enable
    !
    ip forward-protocol nd
    no ip http server
    no ip http secure-server
    !
    !
    !
    no cdp log mismatch duplex
    !
    !
    !
    !
    !
    !
    control-plane
    !
    !
    !
    !         
    !
    !
    !
    gatekeeper
     shutdown
    !
    !
    line con 0
     exec-timeout 0 0
     privilege level 15
     logging synchronous
     stopbits 1
    line aux 0
     exec-timeout 0 0
     privilege level 15
     logging synchronous
     stopbits 1
    line vty 0 4
     login
    !
    end

    D:

    upgrade fpd auto
    service timestamps debug datetime msec
    service timestamps log datetime msec
    no service password-encryption
    !
    hostname D
    !
    boot-start-marker
    boot-end-marker
    !
    logging message-counter syslog
    !
    no aaa new-model
    ip source-route
    no ip icmp rate-limit unreachable
    ip cef
    !
    !
    !
    !         
    no ip domain lookup
    no ipv6 cef
    !
    multilink bundle-name authenticated
    !
    !
    !
    !
    !
    !
    !
    !
    !
    !
    !
    !
    !
    !
    !
    !
    archive
     log config
      hidekeys
    ! 
    !
    !
    !
    !
    ip tcp synwait-time 5
    ip ssh version 1
    !
    !
    !
    !
    interface FastEthernet0/0
     no ip address
     duplex half
     ipv6 address autoconfig
     ipv6 enable
    !
    ip forward-protocol nd
    no ip http server
    no ip http secure-server
    !
    !
    !         
    no cdp log mismatch duplex
    !
    !
    !
    !
    !
    !
    control-plane
    !
    !
    !
    !
    !
    !
    !
    gatekeeper
     shutdown
    !
    !
    line con 0
     exec-timeout 0 0
     privilege level 15
     logging synchronous
     stopbits 1
    line aux 0
     exec-timeout 0 0
     privilege level 15
     logging synchronous
     stopbits 1
    line vty 0 4
     login
    !
    end

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