11-08-2011 05:14 AM - edited 03-04-2019 02:12 PM
I'm having a brain fart here.
I have a Router which is connected to a switch.
The router has Ethernet0 and Ethernet1, both of which are connected to a switch.
E0 and E1 are configured as routed ports
!
interface Ethernet0
description Internet public vlan 510
ip address 60.254.111.121 255.255.255.192
no ip directed-broadcast
ip nat outside
media-type 10BaseT
!
interface Ethernet1
description Wireless_Network
ip address 172.16.1.15 255.255.248.0
no ip directed-broadcast
ip nat inside
media-type 10BaseT
!
The swtich these two ports are connected to has the following configuration.
interface GigabitEthernet2/17
description Wireless router internal
switchport access vlan 199
switchport mode access
switchport port-security maximum 12
switchport port-security aging time 10
switchport port-security violation restrict
switchport port-security aging type inactivity
load-interval 30
no cdp enable
spanning-tree portfast
spanning-tree bpduguard enable
end
interface GigabitEthernet2/18
description Wireless router External
switchport access vlan 510
switchport mode access
switchport port-security maximum 12
switchport port-security aging time 10
switchport port-security violation restrict
switchport port-security aging type inactivity
load-interval 30
no cdp enable
spanning-tree portfast
spanning-tree bpduguard enable
end
E0 is connected to Gi2/17
E1 is connected to Gi2/18
How does the communication work going from L3 Router to a L2 switch.
11-08-2011 05:24 AM
John
Not entirely sure i understand exactly what you mean.
A client in vlan 510 that wants to send traffic to the internet will send traffic to it's default-gateway which should be the eth1 router interface. The router then routes the packet to the outside interface and then sends the packet on to the same switch but in vlan 199.
Presumably the next-hop from your router to the ISP is also attached to the same L2 switch ?
As far as the L2 switch is concerned they are 2 totally separate networks (vlans) that can only communicate via the router.
Note though it's not necessarily a good idea to have the outside and inside vlans on the same L2 switch but it does depend on the rest of your topology.
Jon
11-08-2011 05:41 AM
Well this is basically just for wireless users. So Wireless Internal basically means a totally seperate network from our
LAN. The users on our wireless network cannot ping any addresses, and or have any connectivity to the inside unless
they use VPN. I've been trying to fix all the issues on this network since I've got here. Most of the configurations I have
been finding are messed up it's not even funny. I have already seen a bunch of ACLs with permit statements then a permit any any at the end..... Gotta love those...
11-08-2011 06:30 AM
it looks like you've got a small error in the description of router interface or you've really configured the wrong VLANs on the interfaces.
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