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16
Replies

Switch will not talk to router

mikerocom1
Level 1
Level 1

I have a Cisco 2851 and a 3750. At one point everything was fine and everything was working. I was able to access the internet from multiple vlans. Now for some reason, which i cant figure out, my switch will not ping my router. I cannot access the internet. 

 

I have a cable modem which is DHCP, static IP is not an option. Modem>Router>Switch>Computers

My goal is

Vlan 10 for my internet acces

Vlan 20 for guest wifi

Vlan 30 for IP cameras

 

Any help would be appreciated.

 

Router config:

 

Current configuration : 1810 bytes
!
version 12.4
service timestamps debug datetime msec
service timestamps log datetime msec
no service password-encryption
!
hostname mikerorouter
!
boot-start-marker
boot-end-marker
!
logging message-counter syslog
no logging console
enable secret 5 $1$WC5M$b2bgySF8XI.MqeufJzi2O/
!
no aaa new-model
!
dot11 syslog
ip source-route
!
!
ip cef    
ip dhcp excluded-address 10.10.17.1
ip dhcp excluded-address 10.10.17.2
ip dhcp excluded-address 10.10.17.3
ip dhcp excluded-address 10.10.17.4
ip dhcp excluded-address 10.10.17.5
!
ip dhcp pool mikero
   import all
   network 10.10.17.0 255.255.255.0
   default-router 10.10.17.1 
   dns-server 68.105.28.12 68.105.29.12 68.105.28.11 
!
ip domain name mikero.com
no ipv6 cef
!
multilink bundle-name authenticated
!
voice-card 0
!
username admin secret 5 $1$snHZ$/D6wf/iVK7ii6js.RloA80
archive
 log config
  hidekeys

ip ssh version 2
!
interface GigabitEthernet0/0
 ip address dhcp
 ip nat outside
 ip virtual-reassembly
 duplex auto
 speed auto
!
interface GigabitEthernet0/1
 description LAN
 no ip address
 ip nat inside
 ip virtual-reassembly
 duplex auto
 speed auto
!
interface GigabitEthernet0/1.10
 encapsulation dot1Q 10
 ip address 10.10.17.1 255.255.255.0
 ip nat inside
 ip virtual-reassembly
!
ip forward-protocol nd
ip route 0.0.0.0 0.0.0.0 GigabitEthernet0/0
no ip http server
no ip http secure-server
!
ip nat inside source list 101 interface GigabitEthernet0/0 overload
!
access-list 101 permit ip 10.10.17.0 0.0.0.255 any
!
control-plane
!
mgcp fax t38 ecm
mgcp behavior g729-variants static-pt
!
line con 0
line aux 0
line vty 0 4
 login local
 transport input ssh
line vty 5 15
 login local
 transport input ssh
!
scheduler allocate 20000 1000
end

 

Switch Config:


Current configuration : 3743 bytes
!
version 12.2
no service pad
service timestamps debug uptime
service timestamps log uptime
no service password-encryption
!
hostname mikeroswitch
!
no logging console
enable secret 5 $1$q48p$GHvmx5zju53WBx/7UncGD.
!
username admin secret 5 $1$2dnq$aA2/XzzIatORrobHFoYzc0
no aaa new-model
switch 1 provision ws-c3750-48p
ip subnet-zero
ip domain-name mikero.com
!
ip ssh version 2
!
no file verify auto
spanning-tree mode pvst
spanning-tree extend system-id
!
vlan internal allocation policy ascending
!
interface FastEthernet1/0/1
 shutdown
!
interface FastEthernet1/0/2
 description DESKTOP MIKERO
 switchport access vlan 10
 switchport mode access
!
interface FastEthernet1/0/3
 switchport access vlan 10
 switchport mode access
!
interface FastEthernet1/0/4
 switchport access vlan 10
 switchport mode access
!
interface FastEthernet1/0/5
 switchport access vlan 10
 switchport mode access
!
interface FastEthernet1/0/6
 switchport access vlan 10
 switchport mode access
!
interface FastEthernet1/0/7
 switchport access vlan 10
 switchport mode access
!
interface FastEthernet1/0/8
 switchport access vlan 10
 switchport mode access
!
interface FastEthernet1/0/9
 switchport access vlan 10
 switchport mode access
!
interface FastEthernet1/0/10
 switchport access vlan 10
 switchport mode access
!
interface FastEthernet1/0/11
 switchport access vlan 10
 switchport mode access
!
interface FastEthernet1/0/12
 switchport access vlan 10
 switchport mode access
!
interface FastEthernet1/0/13
 switchport access vlan 10
 switchport mode access
!
interface FastEthernet1/0/14
 switchport access vlan 10
 switchport mode access
!
interface FastEthernet1/0/15
 switchport access vlan 10
 switchport mode access
!
interface FastEthernet1/0/16
 switchport access vlan 10
 switchport mode access
!
interface FastEthernet1/0/17
 shutdown
!
interface FastEthernet1/0/18
 shutdown
!
interface FastEthernet1/0/19
 shutdown
!
interface FastEthernet1/0/20
 shutdown
!
interface FastEthernet1/0/21
 shutdown
!
interface FastEthernet1/0/22
 shutdown
!
interface FastEthernet1/0/23
 shutdown
!         
interface FastEthernet1/0/24
 shutdown
!
interface FastEthernet1/0/25
 shutdown
!
interface FastEthernet1/0/26
 shutdown
!
interface FastEthernet1/0/27
 shutdown
!
interface FastEthernet1/0/28
 shutdown
!
interface FastEthernet1/0/29
 shutdown
!
interface FastEthernet1/0/30
 shutdown
!
interface FastEthernet1/0/31
 shutdown
!
interface FastEthernet1/0/32
 shutdown
!
interface FastEthernet1/0/33
 shutdown
!
interface FastEthernet1/0/34
 shutdown
!
interface FastEthernet1/0/35
 shutdown
!
interface FastEthernet1/0/36
 shutdown
!
interface FastEthernet1/0/37
 shutdown
!
interface FastEthernet1/0/38
 shutdown
!
interface FastEthernet1/0/39
 shutdown
!
interface FastEthernet1/0/40
 shutdown
!
interface FastEthernet1/0/41
 shutdown
!
interface FastEthernet1/0/42
 shutdown
!
interface FastEthernet1/0/43
 shutdown
!
interface FastEthernet1/0/44
 shutdown
!
interface FastEthernet1/0/45
 shutdown
!
interface FastEthernet1/0/46
 shutdown
!
interface FastEthernet1/0/47
 shutdown
!
interface FastEthernet1/0/48
 shutdown
!
interface GigabitEthernet1/0/1
 description UPLINK
 switchport trunk encapsulation dot1q
 switchport mode trunk
!
interface GigabitEthernet1/0/2
 shutdown
!
interface GigabitEthernet1/0/3
 description WAP
 switchport trunk encapsulation dot1q
 switchport mode trunk
!
interface GigabitEthernet1/0/4
 shutdown
!
interface Vlan1
 no ip address
 shutdown
!
interface Vlan10
 description MIKERO
 ip address 10.10.17.2 255.255.255.0
!
ip classless
ip http server
ip http secure-server
!
control-plane
!
line con 0
 speed 115200
line vty 0 4
 login local
 transport input ssh
line vty 5 15
 login local
 transport input ssh
!         
end

1 Accepted Solution

Accepted Solutions

ok, I don't see a default-gateway on the switch

config t

ip default-gateway 10.10.17.1

and test from the switch.

HTH

View solution in original post

16 Replies 16

Reza Sharifi
Hall of Fame
Hall of Fame

The config looks correct.

Can you ping 8.8.8.8 from the router?

HTH

Yes. Router gets IP from isp and is able to ping outside world. I have tried this same config on the 2851 i and a 2811. I have also tried multiple ports for my trunk.

ok, I don't see a default-gateway on the switch

config t

ip default-gateway 10.10.17.1

and test from the switch.

HTH

No workie.

From the switch can you ping the next hop 10.10.17.1?

Can you post the output of traceroute 8.8.8.8 from the switch?

 

 

Ok. So now my question is what about my other vlans? Will i have a default gateway for each vlan or will i only need the one 10.10.17.1?

You just need one default gateway for the switch (10.10.17.1)

If you want the other vlans to talk to Internet, you need to create a sub-interface (just like the one for vlan 10) on the router. You also need to add the NAT statements for those vlans to the router.

HTH

So that should work with with the one default gateway?

 

 

interface GigabitEthernet0/1
 description LAN
 no ip address
 ip nat inside
 ip virtual-reassembly in
 duplex auto
 speed auto
 no shut
!
interface GigabitEthernet0/1.10
 encapsulation dot1Q 10
 ip address 10.10.17.1 255.255.255.0
 ip nat inside
 ip virtual-reassembly in
!
interface GigabitEthernet0/1.20
 encapsulation dot1Q 20
 ip address 10.12.15.1 255.255.255.0
 ip nat inside
 ip virtual-reassembly in
!
interface GigabitEthernet0/1.30
 encapsulation dot1Q 30
 ip address 10.10.10.1 255.255.255.0
 ip nat inside
 ip virtual-reassembly in

Correct. You also need to add the NAT statements

access-list 101 permit ip 10.10.10.0 0.0.0.255 any

access-list 101 permit ip 10.12.15.0 0.0.0.255 any

 

 

10.10.10.0 network wont access the internet. 10.12.15.0 doesnt need to as its just the cameras and my computer has 2 ether net cards.

 

I am getting IP's from 10.10.10.0 but cant access the internet. I cannot ping 10.10.17.1 from a 10.10.10.0 network.

Can you post the latest config from both the switch and the router?

Switch:

mikeroswitch#sho run
Building configuration...

Current configuration : 4747 bytes
!
version 12.2
no service pad
service timestamps debug uptime
service timestamps log uptime
no service password-encryption
!
hostname mikeroswitch
!
no logging console
enable secret 5 $1$q48p$GHvmx5zju53WBx/7UncGD.
!
username admin secret 5 $1$2dnq$aA2/XzzIatORrobHFoYzc0
no aaa new-model
switch 1 provision ws-c3750-48p
ip subnet-zero
ip domain-name mikero.com
!
ip ssh version 2
!
!
!
!
!
no file verify auto
spanning-tree mode pvst
spanning-tree extend system-id
!
vlan internal allocation policy ascending
!
interface FastEthernet1/0/1
 shutdown
!
interface FastEthernet1/0/2
 description DESKTOP MIKERO
 switchport access vlan 10
 switchport mode access
!
interface FastEthernet1/0/3
 switchport access vlan 10
 switchport mode access
!
interface FastEthernet1/0/4
 switchport access vlan 10
 switchport mode access
!
interface FastEthernet1/0/5
 switchport access vlan 10
 switchport mode access
!
interface FastEthernet1/0/6
 switchport access vlan 10
 switchport mode access
!
interface FastEthernet1/0/7
 switchport access vlan 10
 switchport mode access
!
interface FastEthernet1/0/8
 switchport access vlan 10
 switchport mode access
!
interface FastEthernet1/0/9
 switchport access vlan 10
 switchport mode access
!
interface FastEthernet1/0/10
 switchport access vlan 10
 switchport mode access
!
interface FastEthernet1/0/11
 switchport access vlan 10
 switchport mode access
!
interface FastEthernet1/0/12
 switchport access vlan 10
 switchport mode access
!
interface FastEthernet1/0/13
 switchport access vlan 10
 switchport mode access
!
interface FastEthernet1/0/14
 switchport access vlan 10
 switchport mode access
!
interface FastEthernet1/0/15
 switchport access vlan 10
 switchport mode access
!
interface FastEthernet1/0/16
 switchport access vlan 10
 switchport mode access
!
interface FastEthernet1/0/17
 switchport access vlan 20
 switchport mode access
!
interface FastEthernet1/0/18
 switchport access vlan 20
 switchport mode access
!
interface FastEthernet1/0/19
 switchport access vlan 20
 switchport mode access
 shutdown
!
interface FastEthernet1/0/20
 switchport access vlan 20
 switchport mode access
 shutdown
!
interface FastEthernet1/0/21
 switchport access vlan 20
 switchport mode access
 shutdown
!
interface FastEthernet1/0/22
 switchport access vlan 20
 switchport mode access
 shutdown
!
interface FastEthernet1/0/23
 switchport access vlan 20
 switchport mode access
 shutdown
!
interface FastEthernet1/0/24
 switchport access vlan 20
 switchport mode access
 shutdown
!
interface FastEthernet1/0/25
 switchport access vlan 20
 switchport mode access
 shutdown
!
interface FastEthernet1/0/26
 switchport access vlan 20
 switchport mode access
 shutdown
!
interface FastEthernet1/0/27
 switchport access vlan 20
 switchport mode access
 shutdown
!
interface FastEthernet1/0/28
 switchport access vlan 20
 switchport mode access
 shutdown
!
interface FastEthernet1/0/29
 switchport access vlan 20
 switchport mode access
 shutdown
!
interface FastEthernet1/0/30
 switchport access vlan 20
 switchport mode access
 shutdown
!
interface FastEthernet1/0/31
 switchport access vlan 20
 switchport mode access
 shutdown
!
interface FastEthernet1/0/32
 switchport access vlan 20
 switchport mode access
!
interface FastEthernet1/0/33
 shutdown 
!
interface FastEthernet1/0/34
 shutdown
!
interface FastEthernet1/0/35
 shutdown
!
interface FastEthernet1/0/36
 shutdown
!
interface FastEthernet1/0/37
 shutdown
!
interface FastEthernet1/0/38
 shutdown
!
interface FastEthernet1/0/39
 shutdown
!
interface FastEthernet1/0/40
 shutdown
!
interface FastEthernet1/0/41
 shutdown
!
interface FastEthernet1/0/42
 shutdown
!
interface FastEthernet1/0/43
 shutdown
!
interface FastEthernet1/0/44
 shutdown
!
interface FastEthernet1/0/45
 shutdown
!
interface FastEthernet1/0/46
 shutdown
!
interface FastEthernet1/0/47
 shutdown
!
interface FastEthernet1/0/48
 switchport access vlan 30
 shutdown
!
interface GigabitEthernet1/0/1
 description UPLINK
 switchport trunk encapsulation dot1q
 switchport mode trunk
!
interface GigabitEthernet1/0/2
 shutdown
!
interface GigabitEthernet1/0/3
 description WAP
 switchport trunk encapsulation dot1q
 switchport mode trunk
!
interface GigabitEthernet1/0/4
 shutdown
!
interface Vlan1
 no ip address
 shutdown
!
interface Vlan10
 description MIKERO
 ip address 10.10.17.2 255.255.255.0
!
interface Vlan20
 description CAMERAS
 ip address 10.12.15.2 255.255.255.240
!
interface Vlan30
 description MIKERO_GUEST
 ip address 10.10.10.2 255.255.255.0
!
ip default-gateway 10.10.17.1
ip classless
ip http server
ip http secure-server
!
!
control-plane
!
!
line con 0
 speed 115200
line vty 0 4
 login local
 transport input ssh
line vty 5 15
 login local
 transport input ssh
!
end

 

Router:

 

mikerorouter#sho run
Building configuration...


Current configuration : 2342 bytes
!
version 12.4
service timestamps debug datetime msec
service timestamps log datetime msec
no service password-encryption
!
hostname mikerorouter
!
boot-start-marker
boot-end-marker
!
logging message-counter syslog
no logging console
enable secret 5 $1$WC5M$b2bgySF8XI.MqeufJzi2O/
!
no aaa new-model
!
dot11 syslog
ip source-route
!
!
ip cef
ip dhcp excluded-address 10.10.17.1
ip dhcp excluded-address 10.10.17.2
ip dhcp excluded-address 10.10.17.3
ip dhcp excluded-address 10.10.17.4
ip dhcp excluded-address 10.10.17.5
!
ip dhcp pool mikero
   import all
   network 10.10.17.0 255.255.255.0
   default-router 10.10.17.1 
   dns-server 68.105.28.12 68.105.29.12 68.105.28.11 
!
ip dhcp pool mikero_guest
   import all
   network 10.10.10.0 255.255.255.0
   default-router 10.10.10.1 
   dns-server 68.105.28.12 68.105.29.12 68.105.28.11 
!
!
ip domain name mikero.com
no ipv6 cef
!
multilink bundle-name authenticated

voice-card 0
!
!
!
!
!
username admin secret 5 $1$snHZ$/D6wf/iVK7ii6js.RloA80
archive
 log config
  hidekeys

!
!
!
!
ip ssh version 2
!
!
!
!
interface GigabitEthernet0/0
 ip address dhcp
 ip nat outside
 ip virtual-reassembly
 duplex auto
 speed auto
!
interface GigabitEthernet0/1
 description LAN
 no ip address
 ip nat inside
 ip virtual-reassembly
 duplex auto
 speed auto
!
interface GigabitEthernet0/1.10
 encapsulation dot1Q 10
 ip address 10.10.17.1 255.255.255.0
 ip nat inside
 ip virtual-reassembly
!
interface GigabitEthernet0/1.20
 encapsulation dot1Q 20
 ip address 10.12.15.1 255.255.255.240
 ip nat inside
 ip virtual-reassembly
!         
interface GigabitEthernet0/1.30
 encapsulation dot1Q 30
 ip address 10.10.10.1 255.255.255.0
 ip nat inside
 ip virtual-reassembly
!
ip forward-protocol nd
ip route 0.0.0.0 0.0.0.0 GigabitEthernet0/0
no ip http server
no ip http secure-server
!
!
ip nat inside source list 101 interface GigabitEthernet0/0 overload
!
access-list 101 permit ip 10.10.17.0 0.0.0.255 any
access-list 102 permit ip 10.12.15.0 0.0.0.255 any
access-list 103 permit ip 10.10.10.0 0.0.0.255 any
!
!
!
!
!
!
control-plane
!
!
!
!
mgcp fax t38 ecm
mgcp behavior g729-variants static-pt
!
!
!
!
!
!
line con 0
line aux 0
line vty 0 4
 login local
 transport input ssh
line vty 5 15
 login local
 transport input ssh
!
scheduler allocate 20000 1000
end

Try adding this to the switch:

ip 0.0.0.0/0.0.0.0 10.10.17.1

 

ip default-gateway statement is for the switch only.

 

i get invalid input at the first 0.

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