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problem of ping

Abdelilah Benrida
Level 1
Level 1

‎05-17-2013 03:38 AM - edited ‎03-07-2019 01:24 PM

Hi

i'm usig GNS3 and i have to deal with this situation:

ca.jpg

R5 has NM-1FE-TX modul (connected to R4).

R5 has also NM-16ESW modul (connected to R1,R2 and R3).

here are the config :

R4 :

!

interface FastEthernet0/0

ip address 190.1.1.1 255.255.255.0

duplex auto

speed auto

!

interface FastEthernet2/0

ip address 190.1.2.1 255.255.255.0

duplex auto

speed auto

!

no ip http server

no ip http secure-server

!

ip classless

ip route 191.1.1.0 255.255.255.0 190.1.1.2

ip route 191.1.1.0 255.255.255.0 190.1.2.2

!

!

R5:

ip dhcp excluded-address 191.1.1.1 191.1.1.10

!

ip dhcp pool URNE

   network 191.1.1.0 255.255.255.0

   default-router 191.1.1.1

!

!

interface FastEthernet0/0

ip address 190.1.1.2 255.255.255.0

duplex auto

speed auto

!

!

interface FastEthernet2/0

ip address 190.1.2.2 255.255.255.0

duplex auto

speed auto

!

!

interface FastEthernet1/11

switchport access vlan 10

!

interface FastEthernet1/12

switchport access vlan 10

!

interface FastEthernet1/13

switchport access vlan 10

!

!

interface Vlan10

ip address 191.1.1.1 255.255.255.0

!

R1 :

!

interface FastEthernet0/0

ip address dhcp

duplex auto

speed auto

!

R2 :

!

interface FastEthernet0/0

ip address dhcp

duplex auto

speed auto

!

R3 :

!

interface FastEthernet0/0

ip address dhcp

duplex auto

speed auto

!

R1#ping 190.1.1.1

Type escape sequence to abort.

Sending 5, 100-byte ICMP Echos to 190.1.1.1, timeout is 2 seconds:

!!!!!

Success rate is 100 percent (5/5), round-trip min/avg/max = 16/30/52 ms

R1#ping 190.1.2.1

Type escape sequence to abort.

Sending 5, 100-byte ICMP Echos to 190.1.2.1, timeout is 2 seconds:

!!!!!

Success rate is 100 percent (5/5), round-trip min/avg/max = 16/42/68 ms

R2#ping 190.1.1.1

Type escape sequence to abort.

Sending 5, 100-byte ICMP Echos to 190.1.1.1, timeout is 2 seconds:

!!!!!

Success rate is 100 percent (5/5), round-trip min/avg/max = 20/39/68 ms

R2#ping 190.1.2.1

Type escape sequence to abort.

Sending 5, 100-byte ICMP Echos to 190.1.2.1, timeout is 2 seconds:

!!!!!

Success rate is 100 percent (5/5), round-trip min/avg/max = 20/39/60 ms

R3#ping 190.1.1.1

Type escape sequence to abort.

Sending 5, 100-byte ICMP Echos to 190.1.1.1, timeout is 2 seconds:

!!!!!

Success rate is 100 percent (5/5), round-trip min/avg/max = 20/38/72 ms

R3#ping 190.1.2.1

Type escape sequence to abort.

Sending 5, 100-byte ICMP Echos to 190.1.2.1, timeout is 2 seconds:

!!!!!

Success rate is 100 percent (5/5), round-trip min/avg/max = 16/32/72 ms

EVREY THING IS FINE :

now i will shutdown interface f0/0 of R5:

R5(config)#interface f0/0

R5(config-if)#sh

R5(config-if)#end

R5#

*Mar  1 00:24:58.887: %SYS-5-CONFIG_I: Configured from console by console

*Mar  1 00:24:59.799: %LINK-5-CHANGED: Interface FastEthernet0/0, changed state to administratively down

R5#

*Mar  1 00:25:00.799: %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/0, changed state to down

And i ping from routers R1, R2 and R3 190.1.2.1 (other link :(f2/0-----f2/0)).

R1#ping 190.1.2.1

Type escape sequence to abort.

Sending 5, 100-byte ICMP Echos to 190.1.2.1, timeout is 2 seconds:

!!!!!

Success rate is 100 percent (5/5), round-trip min/avg/max = 20/32/64 ms

R2#ping 190.1.2.1

Type escape sequence to abort.

Sending 5, 100-byte ICMP Echos to 190.1.2.1, timeout is 2 seconds:

.....

Success rate is 0 percent (0/5)

R3#ping 190.1.2.1

Type escape sequence to abort.

Sending 5, 100-byte ICMP Echos to 190.1.2.1, timeout is 2 seconds:

!!!!!

Success rate is 100 percent (5/5), round-trip min/avg/max = 24/53/84 ms

why R2 can't ping and others can ?

Labels:
0 Helpful
11 Replies 11

Jan Rolny
Level 3
Level 3

‎05-17-2013 04:04 AM

Hi Abdelilah,

please try to check interface status of R5 and R2 with command sh ip interface brief

Also try to configure interface to fixed speed and duplex on both end.

R2 :

!

interface FastEthernet0/0

ip address dhcp

duplex full

speed 100

R5:

interface FastEthernet1/12

switchport access vlan 10

duplex full

speed 100

I had sometimes simmilar problems if duplex and speed is auto.

Regards,

Jan

0 Helpful

Prasan Venky
Level 3
Level 3
In response to Jan Rolny

‎05-17-2013 04:11 AM

Can you check the trace route result and also the physical port status from R2?.Could be some L1 issue too?

0 Helpful

Abdelilah Benrida
Level 1
Level 1
In response to Jan Rolny

‎05-17-2013 04:14 AM

R5#sh ip int br

Interface                  IP-Address      OK? Method Status                Protocol

FastEthernet0/0            190.1.1.2       YES manual administratively down down (entering shutdown on f0/0)

FastEthernet1/0            unassigned      YES unset  up                    down

FastEthernet1/1            unassigned      YES unset  up                    down

FastEthernet1/2            unassigned      YES unset  up                    down

FastEthernet1/3            unassigned      YES unset  up                    down

FastEthernet1/4            unassigned      YES unset  up                    down

FastEthernet1/5            unassigned      YES unset  up                    down

FastEthernet1/6            unassigned      YES unset  up                    down

FastEthernet1/7            unassigned      YES unset  up                    down

FastEthernet1/8            unassigned      YES unset  up                    down

FastEthernet1/9            unassigned      YES unset  up                    down

FastEthernet1/10           unassigned      YES unset  up                    down

FastEthernet1/11           unassigned      YES unset  up                    up

FastEthernet1/12           unassigned      YES unset  up                    up

FastEthernet1/13           unassigned      YES unset  up                    up

FastEthernet1/14           unassigned      YES unset  up                    down

FastEthernet1/15           unassigned      YES unset  up                    down

FastEthernet2/0            190.1.2.2       YES manual up                     up

     Vlan1                      unassigned      YES unset  up                    down

     Vlan10                     191.1.1.1       YES manual up                    up

R2#sh ip int br

Interface                  IP-Address      OK? Method Status                Protocol

FastEthernet0/0            191.1.1.11      YES DHCP   up                    up

i changed the duplex  and speed auto by duplex full and speed 100

but the problem persists

0 Helpful

Abdelilah Benrida
Level 1
Level 1
In response to Abdelilah Benrida

‎05-17-2013 04:17 AM

R2#ping 190.1.2.1

Type escape sequence to abort.

Sending 5, 100-byte ICMP Echos to 190.1.2.1, timeout is 2 seconds:

.....

Success rate is 0 percent (0/5)

R3#ping 190.1.2.1

Type escape sequence to abort.

Sending 5, 100-byte ICMP Echos to 190.1.2.1, timeout is 2 seconds:

!!!!!

Success rate is 100 percent (5/5), round-trip min/avg/max = 40/52/96 ms

R1#ping 190.1.2.1

Type escape sequence to abort.

Sending 5, 100-byte ICMP Echos to 190.1.2.1, timeout is 2 seconds:

!!!!!

Success rate is 100 percent (5/5), round-trip min/avg/max = 16/31/60 ms

0 Helpful

Prasan Venky
Level 3
Level 3
In response to Abdelilah Benrida

‎05-17-2013 04:30 AM

Can you paste traceroute output..?

0 Helpful

Abdelilah Benrida
Level 1
Level 1
In response to Prasan Venky

‎05-17-2013 04:33 AM

R1#traceroute 190.1.2.1

Type escape sequence to abort.

Tracing the route to 190.1.2.1

  1 191.1.1.1 32 msec 40 msec 28 msec

  2 190.1.2.1 44 msec *  56 msec

R3#traceroute 190.1.2.1

Type escape sequence to abort.

Tracing the route to 190.1.2.1

  1 191.1.1.1 24 msec 48 msec 8 msec

  2 190.1.2.1 32 msec *  36 msec

R2#traceroute 190.1.2.1

Type escape sequence to abort.

Tracing the route to 190.1.2.1

  1 191.1.1.1 36 msec 52 msec 8 msec

  2  *  *  *

  3  *  *  *

  4  *  *  *

  5  *  *  *

  6 etc...

0 Helpful

Abdelilah Benrida
Level 1
Level 1
In response to Abdelilah Benrida

‎05-17-2013 04:34 AM

191.1.1.1 is the adress of  interface VLAN 10 of R5 (dhcp server)

0 Helpful

Abdelilah Benrida
Level 1
Level 1
In response to Abdelilah Benrida

‎05-17-2013 04:37 AM

R1#sh ip route

Gateway of last resort is 191.1.1.1 to network 0.0.0.0

     191.1.0.0/24 is subnetted, 1 subnets

C       191.1.1.0 is directly connected, FastEthernet0/0

S*   0.0.0.0/0 [254/0] via 191.1.1.1

R2#sh ip route

Gateway of last resort is 191.1.1.1 to network 0.0.0.0

     191.1.0.0/24 is subnetted, 1 subnets

C       191.1.1.0 is directly connected, FastEthernet0/0

S*   0.0.0.0/0 [254/0] via 191.1.1.1

R3#sh ip route

Gateway of last resort is 191.1.1.1 to network 0.0.0.0

     191.1.0.0/24 is subnetted, 1 subnets

C       191.1.1.0 is directly connected, FastEthernet0/0

S*   0.0.0.0/0 [254/0] via 191.1.1.1

0 Helpful

cadet alain
VIP Alumni
VIP Alumni
In response to Abdelilah Benrida

‎05-17-2013 04:46 AM

Hi,

take a look at the duplicate post you made in WAN or LAN section, I answered why it was surely behaving this way.

Regards

Alain

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Don't forget to rate helpful posts.

Prasan Venky
Level 3
Level 3
In response to Abdelilah Benrida

‎05-17-2013 04:55 AM

It gets dropped at the L3 Vlan interface at R5 itself.Please attach the full configuration of R2 and R4?

0 Helpful

Abdelilah Benrida
Level 1
Level 1
In response to Prasan Venky

‎05-17-2013 04:57 AM

that is the solution thanks to Alain

i must add this on router R4:

ip sla monitor 1

type echo protocol ipIcmpEcho 190.1.1.2 source-interface FastEthernet0/0

frequency 5

ip sla monitor schedule 1 life forever start-time now

!

!

!

track 1 rtr 1 reachability

!

ip route 191.1.1.0 255.255.255.0 190.1.1.2 track 1

ip route191.1.1.0 255.255.255.0 190.1.2.2 254

0 Helpful
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