Goal: enable IPv6 connectivity between Champlain Host and Middlebury Host through VTEL using RIPng.

• Champlain LAN prefix: 2620:E4:C000::/64
• Middlebury LAN prefix: 2001:1890:139D::/64
• VTEL transit prefix: 1800:2200:185::/64

Routers and links:

• CC-R Fa0/1 → Champlain switch → Champlain Host
• CC-R Fa0/0 ↔ VTEL-R Fa0/0
• MC-R Fa0/0 ↔ VTEL-R Fa0/1
• MC-R Fa0/1 → Middlebury SW → Middlebury Host

All router interfaces are FastEthernet.

Enter config mode and paste these lines exactly in one go:

enable
configure terminal
hostname CC-R
ipv6 unicast-routing
interface FastEthernet0/1
 description Champlain LAN
 ipv6 address 2620:E4:C000::1/64
 ipv6 rip NET330 enable
 no shutdown
exit
interface FastEthernet0/0
 description Link to VTEL
 ipv6 address autoconfig
 ipv6 rip NET330 enable
 no shutdown
exit
end
write memory

enable
configure terminal
hostname VTEL-R
ipv6 unicast-routing
interface FastEthernet0/0
 description Link to CC-R
 ipv6 address 1800:2200:185::1/64 eui-64
 ipv6 rip NET330 enable
 no shutdown
exit
interface FastEthernet0/1
 description Link to MC-R
 ipv6 address 1800:2200:185::2/64 eui-64
 ipv6 rip NET330 enable
 no shutdown
exit
end
write memory

Note: Packet Tracer will generate EUI-64 interface IDs automatically from the NIC MAC. Anything inside 1800:2200:185: is fine as long as both links are in the same /64 and interfaces are up.

enable
configure terminal
hostname MC-R
ipv6 unicast-routing
interface FastEthernet0/1
 description Middlebury LAN
 ipv6 address 2001:1890:139D::1/64
 ipv6 rip NET330 enable
 no shutdown
exit
interface FastEthernet0/0
 description Link to VTEL
 ipv6 address autoconfig
 ipv6 rip NET330 enable
 no shutdown
exit
end
write memory

On both PCs:

• Desktop → IP Configuration → IPv6 Configuration: Automatic
• Do not set IPv4 fields
• You should see:
  • Champlain Host IPv6 address that starts with 2620:E4:C000::
  • Middlebury Host IPv6 address that starts with 2001:1890:139D::
• Default gateway fields will populate from the router RA

Your example outcomes that worked:

• Champlain Host IPv6: 2620:E4:C000:0:200:CFF:FE92:1DCD
• Middlebury Host IPv6: 2001:1890:139D:0:202:17FF:FED9:E22B

On each router:

show ipv6 interface brief

You should see Fa0/0 and Fa0/1 in up/up with addresses in the expected prefixes.

On each router:

show ipv6 route

Look for:

• R 2620:E4:C000::/64 learned on MC-R and VTEL-R
• R 2001:1890:139D::/64 learned on CC-R and VTEL-R
• C 1800:2200:185::/64 connected on VTEL-R and autoconfig addresses on CC-R and MC-R

From Champlain Host:

ping 2001:1890:139D:0:202:17FF:FED9:E22B

From Middlebury Host:

ping 2620:E4:C000:0:200:CFF:FE92:1DCD

You should receive replies in both directions.

Take these on all three routers and include in your writeup:

• show ipv6 route
• show ipv6 interface brief

Also include:

• Champlain Host successful ping to Middlebury Host
• Middlebury Host successful ping to Champlain Host

Recommended placeholders:

• images/ccr_show_ipv6_route.png
• images/vtel_show_ipv6_route.png
• images/mcr_show_ipv6_route.png
• images/champlain_host_ping.png
• images/middlebury_host_ping.png

• Interfaces are no shutdown

• RIPng is enabled on every IPv6 interface that must advertise or learn routes:

  interface Fa0/0
   ipv6 rip NET330 enable
  interface Fa0/1
   ipv6 rip NET330 enable
  

• Host IPv6 set to Automatic

• Use show ipv6 route to confirm router R entries

• If a host does not populate, toggle the PC NIC Off and On or flap the LAN interface:

  interface Fa0/1
   shutdown
   no shutdown
  

• If VTEL does not autoconfig on CC-R or MC-R WAN, issue:

  clear ipv6 neighbors
  clear ipv6 interface Fa0/0
  

• Save config: write memory
• Show routes: show ipv6 route
• Show interfaces: show ipv6 interface brief
• Ping IPv6 from router: ping ipv6 <address>
• Ping IPv6 from PC: ping <address>

• The exact EUI-64 host bits under 1800:2200:185::/64 can differ. Consistency and link-up status are what matter.
• SLAAC provides addresses and default gateway to hosts. No DHCPv6 required for this lab.