Solved: Re: PCs Cannot Ping Default Gateways

TimVincent743 · ‎03-16-2021

Hi all,

I have a network that has 1 router, 3 switches, and 3 PCs, as per the photo attached. My issue is that I have my PC-A that can ping the default gateway. that is a sub interface on the router. Whenever I ping another PC's IP address, it gets to the router but it just sits there until it runs out of time. To add to that, my PC-B and PC-C cannot ping their default gateway (sub interface) at all on the router. Whenever I try to ping the default gateway from either, the pings buffer and never go anywhere. I do have a default gateway set on the switches to their respective VLAN sub interface on the router, and those pings work. I have the PCs on all different VLANs and I have each of those connections set as access for switchport. I am just confused as to why I am not getting any traffic sent out from the PC-B and PC-C.

Any help is appreciated!

Georg Pauwen · ‎03-17-2021

Hello,

you need to create all VLANs on all switches. Attached the working file...

View solution in original post

Reza Sharifi · ‎03-16-2021

Hi,

Can you check to make sure the vlan that PC-B and PC-C are part of added to the trunk port of all switches?

If this did not help, can you post "sh run" from the s2 and s3 switch and point out the interfaces where the PCs are connected?

Also, can you make sure the firewall software on the PCs is not blocking ICMP traffic?

HTH

TimVincent743 · ‎03-16-2021

The vlan is added on all ports already. The firewall on all the PCs are already off.

The configuration from S2:

hostname S2

!

spanning-tree mode pvst

spanning-tree extend system-id

!

interface Port-channel2

switchport trunk native vlan 90

switchport trunk allowed vlan 10,20,30,90

switchport mode trunk

!

interface Port-channel3

!

interface FastEthernet0/1

switchport trunk native vlan 90

switchport trunk allowed vlan 10,20,30,90

switchport mode trunk

channel-group 2 mode active

!

interface FastEthernet0/2

switchport trunk native vlan 90

switchport trunk allowed vlan 10,20,30,90

switchport mode trunk

channel-group 2 mode active

!

interface FastEthernet0/3

channel-group 3 mode on

!

interface FastEthernet0/4

channel-group 3 mode on

!

interface FastEthernet0/5

!

interface FastEthernet0/6

!

interface FastEthernet0/7

!

interface FastEthernet0/8

!

interface FastEthernet0/9

!

interface FastEthernet0/10

!

interface FastEthernet0/11

!

interface FastEthernet0/12

!

interface FastEthernet0/13

!

interface FastEthernet0/14

!

interface FastEthernet0/15

!

interface FastEthernet0/16

!

interface FastEthernet0/17

!

interface FastEthernet0/18 (PC-B connected)

switchport access vlan 20

switchport mode access

!

interface FastEthernet0/19

!

interface FastEthernet0/20

!

interface FastEthernet0/21

!

interface FastEthernet0/22

!

interface FastEthernet0/23

!

interface FastEthernet0/24

!

interface GigabitEthernet0/1

!

interface GigabitEthernet0/2

!

interface Vlan1

no ip address

shutdown

!

interface Vlan20

no ip address

!

interface Vlan90

ip address 172.27.90.11 255.255.255.0

!

ip default-gateway 172.27.90.1

The configuration for S3:

hostname S3

!

no ip domain-lookup

!

spanning-tree mode pvst

spanning-tree extend system-id

!

interface Port-channel1

switchport trunk native vlan 90

switchport trunk allowed vlan 10,20,30,90

switchport mode trunk

!

interface Port-channel3

!

interface FastEthernet0/1

channel-group 3 mode on

!

interface FastEthernet0/2

channel-group 3 mode on

!

interface FastEthernet0/3

switchport trunk native vlan 90

switchport trunk allowed vlan 10,20,30,90

switchport mode trunk

channel-group 1 mode desirable

!

interface FastEthernet0/4

switchport trunk native vlan 90

switchport trunk allowed vlan 10,20,30,90

switchport mode trunk

channel-group 1 mode desirable

!

interface FastEthernet0/5

!

interface FastEthernet0/6

!

interface FastEthernet0/7

!

interface FastEthernet0/8

!

interface FastEthernet0/9

!

interface FastEthernet0/10

!

interface FastEthernet0/11

!

interface FastEthernet0/12

!

interface FastEthernet0/13

!

interface FastEthernet0/14

!

interface FastEthernet0/15

!

interface FastEthernet0/16

!

interface FastEthernet0/17

!

interface FastEthernet0/18 (PC-C)

switchport access vlan 30

switchport mode access

!

interface FastEthernet0/19

!

interface FastEthernet0/20

!

interface FastEthernet0/21

!

interface FastEthernet0/22

!

interface FastEthernet0/23

!

interface FastEthernet0/24

!

interface GigabitEthernet0/1

!

interface GigabitEthernet0/2

!

interface Vlan1

no ip address

shutdown

!

interface Vlan30

no ip address

!

interface Vlan90

ip address 172.27.90.12 255.255.255.0

!

ip default-gateway 172.27.90.1

balaji.bandi · ‎03-16-2021

can you post router and s1 config ?

BB

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TimVincent743 · ‎03-17-2021

The config for R1:

hostname R1

!

no ip domain-lookup!

!

interface GigabitEthernet0/0

no ip address

duplex auto

speed auto

shutdown

!

interface GigabitEthernet0/1

no ip address

duplex auto

speed auto

!

interface GigabitEthernet0/1.10

encapsulation dot1Q 10

ip address 172.27.10.1 255.255.255.0

!

interface GigabitEthernet0/1.20

encapsulation dot1Q 20

ip address 172.27.20.1 255.255.255.0

!

interface GigabitEthernet0/1.30

encapsulation dot1Q 30

ip address 172.27.30.1 255.255.255.0

!

interface GigabitEthernet0/1.90

encapsulation dot1Q 90

ip address 172.27.90.1 255.255.255.0

!

interface Vlan1

no ip address

shutdown

!

The config for S1:

hostname S1

!

no ip domain-lookup

!

spanning-tree mode pvst

spanning-tree extend system-id

!

interface Port-channel1

switchport trunk native vlan 90

switchport trunk allowed vlan 10,20,30,90

switchport mode trunk

!

interface Port-channel2

switchport trunk native vlan 90

switchport trunk allowed vlan 10,20,30,90

switchport mode trunk

!

interface FastEthernet0/1

switchport trunk native vlan 90

switchport trunk allowed vlan 10,20,30,90

switchport mode trunk

channel-group 2 mode passive

!

interface FastEthernet0/2

switchport trunk native vlan 90

switchport trunk allowed vlan 10,20,30,90

switchport mode trunk

channel-group 2 mode passive

!

interface FastEthernet0/3

switchport trunk native vlan 90

switchport trunk allowed vlan 10,20,30,90

switchport mode trunk

channel-group 1 mode auto

!

interface FastEthernet0/4

switchport trunk native vlan 90

switchport trunk allowed vlan 10,20,30,90

switchport mode trunk

channel-group 1 mode auto

!

interface FastEthernet0/5

switchport trunk allowed vlan 10,20,30,90

switchport mode trunk

!

interface FastEthernet0/6 (Connected to PC-A)

switchport access vlan 10

switchport mode access

!

interface FastEthernet0/7

!

interface FastEthernet0/8

!

interface FastEthernet0/9

!

interface FastEthernet0/10

!

interface FastEthernet0/11

!

interface FastEthernet0/12

!

interface FastEthernet0/13

!

interface FastEthernet0/14

!

interface FastEthernet0/15

!

interface FastEthernet0/16

!

interface FastEthernet0/17

!

interface FastEthernet0/18

!

interface FastEthernet0/19

!

interface FastEthernet0/20

!

interface FastEthernet0/21

!

interface FastEthernet0/22

!

interface FastEthernet0/23

!

interface FastEthernet0/24

!

interface GigabitEthernet0/1

!

interface GigabitEthernet0/2

!

interface Vlan1

no ip address

shutdown

!

interface Vlan10

no ip address

!

interface Vlan90

ip address 172.27.90.10 255.255.255.0

!

ip default-gateway 172.27.90.1

Reza Sharifi · ‎03-17-2021

Since vlan 90 is your native vlan on the switches, do the same on the router and make it native.

interface GigabitEthernet0/1.90

encapsulation dot1Q 90 native

ip address 172.27.90.1 255.255.255.0

and test.

HTH

TimVincent743 · ‎03-17-2021

I tried to ping PC-B from PC-A and it still does not go to PC-B from the Router. The packet tracer file is attached so the issue can be seen.

Georg Pauwen · ‎03-17-2021

Hello,

you need to create all VLANs on all switches. Attached the working file...

TimVincent743 · ‎03-17-2021

It works, thank you so much for the help!

Georg Pauwen · ‎03-17-2021

Hello,

since it is difficult to tell what exactly you are missing, I have recreated your topology. Attached the revised file with end-to-end connectivity. You need Packet Tracer version 8 in order to be able to open the file...