Troubleshoot IPv4 Network Connectivity

9
PC1#telnet 10.10.3.30
Trying 10.10.3.30 ...
% Destination unreachable; gateway or host down

PC1#ping 10.10.3.30
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 10.10.3.30, timeout is 2 seconds:
U.U.U
Success rate is 0 percent (0/5)

PC1#ping 10.10.3.1
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 10.10.3.1, timeout is 2 seconds:
U.U.U
Success rate is 0 percent (0/5)
PC1#ping 10.1.1.1
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 10.1.1.1, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 1/1/2 ms
PC1#
R3#sh ip int brief
Interface                  IP-Address      OK? Method Status                Protocol
Ethernet0/0                10.10.3.1       YES TFTP   administratively down down                                  
Ethernet0/1                unassigned      YES TFTP   administratively down down                                      
Ethernet0/2                unassigned      YES TFTP   administratively down down                                      
Ethernet0/3                unassigned      YES TFTP   administratively down down                                      
Ethernet1/0                unassigned      YES TFTP   administratively down down                                      
Ethernet1/1                unassigned      YES TFTP   administratively down down                                      
Ethernet1/2                unassigned      YES TFTP   administratively down down                                      
Ethernet1/3                unassigned      YES TFTP   administratively down down                                      
Ethernet2/0                10.1.1.1        YES TFTP   up                    up                                                          
...

R3(config)#int e0/0

R3(config-if)#no shutdown

R3(config-if)#

*Apr 17 19:33:26.640: %LINK-3-UPDOWN: Interface Ethernet0/0, changed state to up

*Apr 17 19:33:27.645: %LINEPROTO-5-UPDOWN: Line protocol on Interface Ethernet0/0, changed state to up

R3#sh ip int brief

Interface                  IP-Address      OK? Method Status                Protocol

Ethernet0/0                10.10.3.1       YES TFTP   up                    up

Ethernet0/1                unassigned      YES TFTP   administratively down down

Ethernet0/2                unassigned      YES TFTP   administratively down down

...
PC1#telnet 10.10.3.30
Trying 10.10.3.30 ... Open
User Access Verification
Username: admin
Password:
SRV1>

PC1#ping SRV2

Type escape sequence to abort.

Sending 5, 100-byte ICMP Echos to 10.10.1.40, timeout is 2 seconds:

.....

Success rate is 0 percent (0/5)

SRV2#sh int e0/0

Ethernet0/0 is up, line protocol is up

  Hardware is AmdP2, address is aabb.cc00.0a00 (bia aabb.cc00.0a00)

  Internet address is 10.10.4.40/24

  MTU 1500 bytes, BW 10000 Kbit/sec, DLY 1000 usec,

     reliability 255/255, txload 1/255, rxload 1/255

  Encapsulation ARPA, loopback not set

 .....

PC1(config)#ip host SRV2 10.10.4.40

PC1#ping SRV2

Type escape sequence to abort.

Sending 5, 100-byte ICMP Echos to 10.10.4.40, timeout is 2 seconds:

.!!!!

Success rate is 80 percent (4/5), round-trip min/avg/max = 1/1/2 ms

PC2#ping 10.10.3.30

Type escape sequence to abort.

Sending 5, 100-byte ICMP Echos to 10.10.3.30, timeout is 2 seconds:

.....

Success rate is 0 percent (0/5)

PC2#sh ip route

Default gateway is 10.0.2.1

Host               Gateway           Last Use    Total Uses  Interface

ICMP redirect cache is empty

PC2(config)#ip default-gateway 10.10.2.1

PC2#ping 10.10.3.30

Type escape sequence to abort.

Sending 5, 100-byte ICMP Echos to 10.10.3.30, timeout is 2 seconds:

!!!!!

Success rate is 100 percent (5/5), round-trip min/avg/max = 1/202/1005 ms

PC2#telnet 10.10.4.40

Trying 10.10.4.40 ...

% Destination unreachable; gateway or host down

PC2#ping 10.10.4.40

Type escape sequence to abort.

Sending 5, 100-byte ICMP Echos to 10.10.4.40, timeout is 2 seconds:

!!!!!

Success rate is 100 percent (5/5), round-trip min/avg/max = 5/5/6 ms

PC2#traceroute 10.10.4.40

Type escape sequence to abort.

Tracing the route to SRV2 (10.10.4.40)

VRF info: (vrf in name/id, vrf out name/id)

  1 10.10.2.1 5 msec 0 msec 0 msec

  2 10.1.1.13 1 msec 2 msec 1 msec

  3 10.1.1.13 !A  !A  *

R4#sh ip access-lists

Extended IP access list Server

    10 deny udp any any (3 matches)

    20 deny tcp any any eq telnet (1 match)

    30 deny tcp any any eq www

    40 permit ip any any (10 matches)

R4(config)#ip access-list extended Server

R4(config-ext-nacl)#no 20

R4(config-ext-nacl)#20 permit tcp any any eq 23

PC2#telnet 10.10.4.40

Trying 10.10.4.40 ... Open

User Access Verification

Username: admin

Password:

SRV2>