ping question

hi, I am still new to networking. Could anyone tell me why I able ping the gateway (10.0.1.1/29) and S1 (10.0.1.2/29 middle switch) from my PC but unable to ping the switch(10.0.1.3/29) where my pc(172.20.0.2) is Directly connected? thanks.

*all switches are in VLAN 99 and the PC on VLAN 10.

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MAC_Addy

Wrong default gateway on the switch, most likely. Can you post the configs? Maybe condense them a bit.

txn41655

Router#show running-config
Building configuration...

Current configuration : 1312 bytes
!
version 15.1
no service timestamps log datetime msec
no service timestamps debug datetime msec
no service password-encryption
!
hostname Router
!
no ip cef
no ipv6 cef
!
license udi pid CISCO1941/K9 sn FTX152447HP
!
spanning-tree mode pvst
!

interface GigabitEthernet0/0
no ip address
duplex auto
speed auto
!
interface GigabitEthernet0/0.10
encapsulation dot1Q 10
ip address 172.20.0.1 255.255.255.224
!
interface GigabitEthernet0/0.20
encapsulation dot1Q 20
ip address 172.20.0.33 255.255.255.224
!
interface GigabitEthernet0/0.99
encapsulation dot1Q 99
ip address 10.0.1.1 255.255.255.248
!
interface GigabitEthernet0/1
no ip address
duplex auto
speed auto
!
interface GigabitEthernet0/1.10
encapsulation dot1Q 10
ip address 172.20.0.65 255.255.255.224
!
interface GigabitEthernet0/1.20
encapsulation dot1Q 20
ip address 172.20.0.97 255.255.255.224
!
interface GigabitEthernet0/1.99
encapsulation dot1Q 99
ip address 10.0.2.1 255.255.255.248
!
interface Serial0/0/0
ip address 192.168.9.1 255.255.255.252
!
interface Serial0/0/1
ip address 192.168.9.5 255.255.255.252
!
interface Vlan1
no ip address
shutdown
!
router rip
!
ip classless
!
ip flow-export version 9
!
line con 0
!
line aux 0
!
line vty 0 4
login
!
end

txn41655

Actually My PC(172.20.0.2) is on VLAN 10 but I thought I configured the router for inter-VLAN communications!?

MAC_Addy

Looks like this is configured wrong:

interface GigabitEthernet0/1.99
encapsulation dot1Q 99
ip address 10.0.2.1 255.255.255.248

txn41655

Could you explain why is that configured wrong? thanks.

*GigabitEthernet 0/1 is connected to middle switch S2 (10.0.2.2/29 VLAN 99).

MAC_Addy

You have this:

interface GigabitEthernet0/0.99
encapsulation dot1Q 99
ip address 10.0.1.1 255.255.255.248

And this:

interface GigabitEthernet0/1.99
encapsulation dot1Q 99
ip address 10.0.2.1 255.255.255.248

Both are different subnets.

p@r0tuXus

Both are different subnets.

You've got the same issue going on with the other VLANs also. Check your subnets!

txn41655

yes,I have 2 subnets. Would that prevent my PC-A.1 ping the directly connected switch?

ScreenHunter_006.jpg

MAC_Addy

Can you ask the question again? You gave the diagram for the whole topology, but I cannot tell which PC you're trying to ping from.

txn41655

sure, why CAn't I ping the switch(10.0.1.3/29) FROM my PC-A.1 (172.20.0.2)?? I can ping the middle switch and can ping the gateway.thanks.

ScreenHunter_006.jpg

dontstop

Is the SVI up on the switch? Is the SVI in the right VLAN? Can you show us the config & show ip int brief on the switch?

txn41655

PC-A.1 is connected to FastEthernet0/5 (vlan 10) . I am able ping switch S2 (10.0.2.2) from PC-A.1 (172.20.0.2).

Switch#show ip interface brief
Interface IP-Address OK? Method Status Protocol

FastEthernet0/1 unassigned YES manual up up

FastEthernet0/2 unassigned YES manual down down

FastEthernet0/3 unassigned YES manual down down

FastEthernet0/4 unassigned YES manual down down

FastEthernet0/5 unassigned YES manual up up

FastEthernet0/6 unassigned YES manual down down

FastEthernet0/7 unassigned YES manual down down

FastEthernet0/8 unassigned YES manual down down

FastEthernet0/9 unassigned YES manual down down

FastEthernet0/10 unassigned YES manual up up

FastEthernet0/11 unassigned YES manual down down

FastEthernet0/12 unassigned YES manual down down

FastEthernet0/13 unassigned YES manual down down

FastEthernet0/14 unassigned YES manual down down

FastEthernet0/15 unassigned YES manual up up

FastEthernet0/16 unassigned YES manual down down

FastEthernet0/17 unassigned YES manual down down

FastEthernet0/18 unassigned YES manual down down

FastEthernet0/19 unassigned YES manual down down

FastEthernet0/20 unassigned YES manual up up

FastEthernet0/21 unassigned YES manual down down

FastEthernet0/22 unassigned YES manual down down

FastEthernet0/23 unassigned YES manual down down

FastEthernet0/24 unassigned YES manual down down

GigabitEthernet0/1 unassigned YES manual down down

GigabitEthernet0/2 unassigned YES manual down down

Vlan1 unassigned YES manual up up

Vlan10 unassigned YES manual up up

Vlan20 unassigned YES manual up up

Vlan99 10.0.1.3 YES manual up up

dontstop

If you can post up your packet tracer file to somewhere like http://www.filedropper.com/ please

ypark

You don't have an IP address assigned to the switch and vlan 1 is shutdown. Also, I don't see a default-gateway configured.

If you can ping SW1, look at the config on SW1 and see what's different.

txn41655

thanks ypark, the default gateway was missing. it working now!!