16.3.2 Packet Tracer - Troubleshoot IPv4 and IPv6 Static and Default Routes - Physical Mode Answers
Topology
Addressing Table
| Device | Interface | IP Address / Prefix | Default Gateway |
|---|---|---|---|
| R1 | G0/0/0 | 192.168.0.1/28 | N/A |
| 2001:db8:acad::1/64 | |||
| G0/0 | 192.168.0.17/28 | ||
| 2001:db8:acad:16::1/64 | |||
| G0/1 | 172.16.1.1/24 | ||
| 2001:db8:acad:171::1/64 | |||
| G0/2 | 209.165.200.1/25 | ||
| 2001:db8:acad:209::1/64 | |||
| R2 | G0/0/0 | 192.168.0.14/28 | N/A |
| 2001:db8:acad::14/64 | |||
| G0/0 | 192.168.0.30/28 | ||
| 2001:db8:acad:16::2/64 | |||
| G0/1 | 172.16.2.1/24 | ||
| 2001:db8:acad:172::1/64 | |||
| G0/2 | 209.165.200.129/25 | ||
| 2001:db8:acad:210::1/64 | |||
| PC1 | NIC | 172.16.1.2/24 | 172.16.1.1 |
| 2001:db8:acad:171::2/64 | fe80::1 | ||
| PC2 | NIC | 209.165.200.2/25 | 209.165.200.1 |
| 2001:db8:acad:209::2/64 | fe80::1 | ||
| PC3 | NIC | 172.16.2.2/24 | 172.16.2.1 |
| 2001:db8:acad:172::2/64 | fe80::2 | ||
| PC4 | NIC | 209.165.200.130/25 | 209.165.200.129 |
| 2001:db8:acad:210::2/64 | fe80::2 |
Objectives
- Part 1: Evaluate Network Operation
- Part 2: Gather Information, Create an Action Plan, and Implement Corrections
Background / Scenario
All the network devices in this Packet Tracer Physical Mode (PTPM) activity have been preconfigured to include intentional errors that are preventing the network from routing as intended. Your task is to evaluate the network, identify, and correct the configuration errors to restore full connectivity. You may find errors with the route statements or with other configurations that impact the accuracy of the route statements.
Note: The static routing approach used in this activity is used to assess your ability to configure different types of static routes only. This approach may not reflect networking best practices.
Instructions
Part 1: Evaluate Network Operation
Use the ping and/or traceroute commands from the router to test the following criteria and record the results.
Note: Use the PCs in the wiring closet to gain console access to networking devices in order to explore and change the device configurations.
- Traffic from R1 to the 172.16.2.1 address on R2 uses the next hop 192.168.0.14.
R1# traceroute 172.16.2.1 Type escape sequence to abort. Tracing the route to 172.16.2.1 1 192.168.0.14 0 msec 0 msec 0 msec - Traffic from R1 to the 209.165.200.129 address on R2 uses the next hop 192.168.0.30.
R1# traceroute 209.165.200.129 Type escape sequence to abort. Tracing the route to 209.165.200.129 1 192.168.0.30 0 msec 2 msec 0 msec - When the G0/0/0 interface on R1 is shut down, traffic from R1 to the 172.16.2.1 address on R2 uses the next hop 192.168.0.30.
R1(config)# interface gigabitethernet 0/0/0 R1(config-if)# shutdown R1(config-if)# end R1# traceroute 172.16.2.1 Type escape sequence to abort. Tracing the route to 172.16.2.1 1 192.168.0.30 0 msec 0 msec 0 msec - Traffic from R2 to the 2001:db8:acad:171::1 address on R1 uses the next hop 2001:db8:acad::1.
R2# traceroute 2001:db8:acad:171::1 Type escape sequence to abort. Tracing the route to 2001:db8:acad:171::1 1 2001:DB8:ACAD::1 1 msec 0 msec 0 msec - Traffic from R2 to the 2001:db8:acad:209::1 address on R1 uses the next hop 2001:db8:acad:16::1.
R2# traceroute 2001:db8:acad:209::1 Type escape sequence to abort. Tracing the route to 2001:db8:acad:209::1 1 2001:DB8:ACAD:16::1 0 msec 0 msec 0 msec - When the G0/0/0 interface on R2 is shut down, traffic from R2 to the 2001:db8:acad:171::1 address on R1 uses the next hop 2001:db8:acad:16::1.
R2(config)# interface gigabitethernet 0/0/0 R2(config-if)# shutdown R2(config-if)# end R2# traceroute 2001:db8:acad:171::1 Type escape sequence to abort. Tracing the route to 2001:db8:acad:171::1 1 2001:DB8:ACAD:16::1 0 msec 0 msec 3 msec
Part 2: Gather Information, Create an Action Plan, and Implement Corrections
a. For each criterion that is not met, gather information by examining the running configuration and routing tables to develop a hypothesis for what is causing the malfunction.
R1:
R1# show running-config | include ip route
ip route 209.165.200.128 255.255.255.128 192.168.0.3
ip route 0.0.0.0 0.0.0.0 192.168.0.14 80
ip route 0.0.0.0 0.0.0.0 192.168.0.3R2:
R2# show running-config | include ipv6 route
ipv6 route 2001:DB8:ACAD:209::/64 2001:DB7:ACAD:16::1
ipv6 route ::/0 2001:DB8:ACAD::1 90
ipv6 route ::/0 2001:DB8:ACAD:15::1b. Create an action plan that you think will fix the issue. Develop a list of all the commands you intend to use to fix the issue, and a list of all the commands you need to revert the configuration, should your action plan fail to correct the issue.
c. Execute your action plans one at a time for each criterion that fails, and record the fix actions.
Routing problems on both routers:
- Wrong IP for next hop: R1 route to 209.165.200.128/25 via 192.168.0.3; R2 route to 2001:db8:acad:209::/64 via 2001:db7:acad:16::1.
- AD set high versus default: the primary default route uses AD 80 on R1 (via 192.168.0.14) and AD 90 on R2 (via 2001:db8:acad::1).
- Default AD used and wrong next hop IP: the floating default route uses AD 1 with next hop 192.168.0.3 on R1 and 2001:db8:acad:15::1 on R2.
R1:
R1(config)# no ip route 209.165.200.128 255.255.255.128 192.168.0.3 R1(config)# ip route 209.165.200.128 255.255.255.128 192.168.0.30 R1(config)# no ip route 0.0.0.0 0.0.0.0 192.168.0.14 80 R1(config)# ip route 0.0.0.0 0.0.0.0 192.168.0.14 R1(config)# no ip route 0.0.0.0 0.0.0.0 192.168.0.3 R1(config)# ip route 0.0.0.0 0.0.0.0 192.168.0.30 80
R2:
R2(config)# no ipv6 route 2001:db8:acad:209::/64 2001:db7:acad:16::1 R2(config)# ipv6 route 2001:db8:acad:209::/64 2001:db8:acad:16::1 R2(config)# no ipv6 route ::/0 2001:db8:acad::1 90 R2(config)# ipv6 route ::/0 2001:db8:acad::1 R2(config)# no ipv6 route ::/0 2001:db8:acad:15::1 R2(config)# ipv6 route ::/0 2001:db8:acad:16::1 80
Device Configs - Final
ROUTER R1
! ============================================================== !--- 16.3.2 Packet Tracer - Troubleshoot IPv4 and IPv6 Static and Default Routes - Physical Mode !--- FIX SCRIPT FOR ROUTER R1 !--- Usage: copy this whole file and paste it into the R1 terminal (start at the R1> prompt). Every line beginning with "!" is a comment; IOS ignores it, so pasting a comment by accident is harmless. ! ============================================================== enable configure terminal ! -------------------------------------------------------------- !--- Part 2: Gather Information, Create an Action Plan, and Implement Corrections. ! -------------------------------------------------------------- !--- 1. Wrong IP for next hop: the route to 209.165.200.128/25 points to 192.168.0.3 (no device uses it). Use R2 G0/0 (192.168.0.30). no ip route 209.165.200.128 255.255.255.128 192.168.0.3 ip route 209.165.200.128 255.255.255.128 192.168.0.30 !--- 2. AD set high versus default: the primary default route via R2 G0/0/0 (192.168.0.14) has AD 80. Recreate it with the default AD. no ip route 0.0.0.0 0.0.0.0 192.168.0.14 80 ip route 0.0.0.0 0.0.0.0 192.168.0.14 !--- 3. Default AD used and wrong next hop IP: the floating default route uses AD 1 and next hop 192.168.0.3. Use 192.168.0.30 with AD 80. no ip route 0.0.0.0 0.0.0.0 192.168.0.3 ip route 0.0.0.0 0.0.0.0 192.168.0.30 80 end ! -------------------------------------------------------------- !--- Save the configuration to NVRAM. (Press Enter when prompted for the destination filename.) ! -------------------------------------------------------------- copy running-config startup-config ! ============================================================== !--- Verification: !--- show ip route static -> S* 0.0.0.0/0 [1/0] via 192.168.0.14; S 209.165.200.128/25 [1/0] via 192.168.0.30 !--- traceroute 172.16.2.1 -> first hop 192.168.0.14 !--- traceroute 209.165.200.129 -> first hop 192.168.0.30 !--- Note: after testing the failover (shutdown on G0/0/0 -> first hop 192.168.0.30), enter "no shutdown" on G0/0/0 again. ! ==============================================================
ROUTER R2
! ============================================================== !--- 16.3.2 Packet Tracer - Troubleshoot IPv4 and IPv6 Static and Default Routes - Physical Mode !--- FIX SCRIPT FOR ROUTER R2 !--- Usage: copy this whole file and paste it into the R2 terminal (start at the R2> prompt). Every line beginning with "!" is a comment; IOS ignores it, so pasting a comment by accident is harmless. ! ============================================================== enable configure terminal ! -------------------------------------------------------------- !--- Part 2: Gather Information, Create an Action Plan, and Implement Corrections. ! -------------------------------------------------------------- !--- 1. Wrong IP for next hop: the route to 2001:db8:acad:209::/64 points to 2001:db7:acad:16::1. Use R1 G0/0 (2001:db8:acad:16::1). no ipv6 route 2001:db8:acad:209::/64 2001:db7:acad:16::1 ipv6 route 2001:db8:acad:209::/64 2001:db8:acad:16::1 !--- 2. AD set high versus default: the primary default route via R1 G0/0/0 (2001:db8:acad::1) has AD 90. Recreate it with the default AD. no ipv6 route ::/0 2001:db8:acad::1 90 ipv6 route ::/0 2001:db8:acad::1 !--- 3. Default AD used and wrong next hop IP: the floating default route uses AD 1 and next hop 2001:db8:acad:15::1. Use 2001:db8:acad:16::1 with AD 80. no ipv6 route ::/0 2001:db8:acad:15::1 ipv6 route ::/0 2001:db8:acad:16::1 80 end ! -------------------------------------------------------------- !--- Save the configuration to NVRAM. (Press Enter when prompted for the destination filename.) ! -------------------------------------------------------------- copy running-config startup-config ! ============================================================== !--- Verification: !--- show ipv6 route -> S ::/0 [1/0] via 2001:DB8:ACAD::1; S 2001:DB8:ACAD:209::/64 [1/0] via 2001:DB8:ACAD:16::1 !--- traceroute 2001:db8:acad:171::1 -> first hop 2001:db8:acad::1 !--- traceroute 2001:db8:acad:209::1 -> first hop 2001:db8:acad:16::1 !--- Note: after testing the failover (shutdown on G0/0/0 -> first hop 2001:db8:acad:16::1), enter "no shutdown" on G0/0/0 again. ! ==============================================================
