No internet access on any VLAN on cisco 4507 switch

[Navindar Singh]

Hello Guys,

I am configuring a cisco 4507 catalyst switch and have managed to create a few vlans for testing and i also have connectivity between the vlans and also the access switches. I have internet on the cisco 4507 and am able to ping outside too, but when i connect to a particular vlan, i am able to ping the vlan gateway and also all other vlans but i do not get internet. Hope someone can assist me in this. Attached is the configs.

Regards.

Navin

[Navindar Singh]

thanks for your response, do you want me to add ip nat pool (anyname) 10.0.0.0 0.255.255.255 prefix-length 30 on the internet router?

[Charles Hill]

What type of device is in front of the internet router?

Metro E 3400 switch?  Hopefully not a linksys wireless router, or anything similar.:)

Does a "ping 8.8.8.8 source "ip address of other vlans"", fail as well.

[Navindar Singh]

its a cisco 4507 switch, yes ping from all vlans fail but i can ping outside from the core switch. I have attached the current configs, if you could have a look please.

[Andre Neethling · Accepted solution]

Hi. Your router does not have a route back to your plans. Add the following route to your router.

ip route 10.0.0.0 255.255.0.0 10.2.5.55

Or you can just enable EIGRP to share routes between your router and core switch by adding the following to your router

router eigrp 1
 network 10.2.5.1 0.0.0.255

 no auto-summary

​and also add no auto-summary to your core switch.

[Navindar Singh]

Thank you so much Andre, its working perfectly now. Really appreciate the help. Have a good day.

[Navindar Singh]

Hello Andre, Thanks for the response,i tried that also and still the same thing, i have internet on the router and the core switch but not on the vlans, any other suggestions.

[Navindar Singh]

I have put in a internet router before the switch and i think i need to do some natting on it. Attached is the config, hope you can check and assist.

[Navindar Singh]

Hello Andre, i just have one more small issue. I added the following on the router (and core) and internet works fine for the 10.x.x.x subenets

router eigrp 1

network 10.0.0.0

network 172.0.0.0

no auto-summary

I have added another vlan 172.20.0.0/20 on the core switch and have added the exact same eigrp commands for that network but i cannot seem to get internet on the 172.x.x.x subnet. Could you please assist as i might be missing something.

[Navindar Singh]

Please ignore this, i managed to get it working.

[Andre Neethling]

You must remember to make sure that all new subnets are covered by your NAT acl on the router.