Learn how to a build a cloud-first strategyRegister Now

x
  • Status: Solved
  • Priority: Medium
  • Security: Public
  • Views: 572
  • Last Modified:

Cisco 831 interface question

I can't figure out why the IOS shows 3 ethernet interfaces and 4 fast ethernet interfaces.  On the back of the device, there is the WAN interface which is known as Ethernet1, then the 4 LAN ports which all apparently belong to group Ethernet0.  Assuming this is true, what is Ethernet2 then?  Which physical port does it map to, and what would you use it for?
0
B1izzard
Asked:
B1izzard
  • 3
  • 2
  • 2
1 Solution
 
Istvan KalmarCommented:
Hi,

eth 0 - eth 3 belongs to LAN, eth4 belongs to WAN
0
 
Istvan KalmarCommented:
and defaultly the eth0-eth3 belongs to same vlan
0
 
B1izzardAuthor Commented:
After testing shutting down the FastEthernet1-4 interfaces, it appears that they are all grouped in with the LAN interface Ethernet0.  When I shutdown FastEthernet1 for example, just the one  PC loses connectivity.  When I shutdown Ethernet0, all 4 PC's lose connectivity.

Ethernet1 is the WAN interface.  There is only Ethernet0-2, not Ethernet0-3.  I still can't figure out what Ethernet2 is doing in there and what it is for.  Any other ideas?
0
Veeam Disaster Recovery in Microsoft Azure

Veeam PN for Microsoft Azure is a FREE solution designed to simplify and automate the setup of a DR site in Microsoft Azure using lightweight software-defined networking. It reduces the complexity of VPN deployments and is designed for businesses of ALL sizes.

 
Istvan KalmarCommented:
Could you show us the config?

0
 
rochey2009Commented:
Hi,

http://www.cisco.com/en/US/docs/ios/12_3/12_3x/12_3xr/dmz_port.html#wp1052583

The Demilitarized Zone (DMZ) port permits two LAN networks instead of the currently available single LAN network. This feature will enable switch port 4 of the existing four 10/100 switch ports to be optionally used as a Layer 3 LAN port, thereby providing Cisco 830 series routers with one more 10-Mbps Layer 3 LAN port. The new LAN port can be used for DMZ purposes for public access to the customer's web and other servers that are accessible from the Internet. The existing LAN network ports will continue to be used for private internal traffic.

Typically the DMZ port is configured at a lower security level than the other LAN ports on the Cisco 830 series router.

To enable the DMZ Port feature, use the interface ethernet 2 command in interface configuration mode.
0
 
B1izzardAuthor Commented:
Thanks!  That's the info I was looking for.
0
 
rochey2009Commented:
Your welcome.
0

Featured Post

Upgrade your Question Security!

Add Premium security features to your question to ensure its privacy or anonymity. Learn more about your ability to control Question Security today.

  • 3
  • 2
  • 2
Tackle projects and never again get stuck behind a technical roadblock.
Join Now