Need help in configuring Switching and Routing on Cisco 1812

[srinivas.tammali]

Dear Cisco Experts,

Need your valuable inputs in setting up my test lab; i have bought a Cisco 1812-J/K9 ISR a month ago and still struggling make it work the way i want. I am very new to Cisco devices and basically to advance networking concepts as well. I did go through loads of videos and steps from cisco documents and our good old friend google too, finally posting it here.

Ok heres the hardware i have:

HP DL 380 G7 server with 4 Nics 

Cisco 1812-J/K9 ISR which has 2 WAN Ports[Fe0 & Fe9] & 8 LAN Ports[F2 to Fe9]

Dlink DIR-816L home router provided by my ISP - Capabilities DHCP, Wireless & LAN ports 4

Software & Connectivity Information:

HP Server is loaded with Windows 2012 R2; configured Hyper V with 3 Hyper-V virtual Switches with VLAN IDs as 3, 5 & 9, each Hyper-V virtual Switch is configured to use 1 physical nic, so i have the following setup:

Hyper-V vSwitch 1 - VLAN ID 3 --> Connected Physical Nic1 --> Connected to Fe3 on Cisco 1812

Cisco Configuration: 

Fe0 port on Cisco is connected to Dlink Home Router on Port 2 and i have assigned the ip to Fe0 which 192.168.0.10

Enabled IP Routing 

Created VLAN 3 

Assigned IP to VLAN 3 as 192.168.3.2 255.255.255.0

trunking enabled on VLAN 3 and native vlan enabled & configured to use VLAN 8[Fe8 Int added and no physical connection on Fe 8]

Fe0 interface on Cisco is connected to Dlink Home Router on Interface 2 and i have assigned an ip to Fe0 as 192.168.0.10

Configured Static Route 192.168.3.0 255.255.255.0 192.168.0.1 <-- This is my dlink router ip

Configured Last Resort Gateway as 0.0.0.0 0.0.0.0 192.168.0.1 <-- This is my dlink router ip

Enabled IP ROUTING

I can ping from cisco to devices 192.168.3.0 network [example: i can ping 192.168.3.2[VLAN 3 IP] & 192.168.3.3[Physical Nic 1 on my Hyper-V host] & 192.168.3.5[Static IP assigned to a centos VM which is connected to Hyper-V vSwitch1 which is connected to Physical Nic1] 

I can ping from the CentOS VM mentioned above to all the devices on 192.168.3.0 and can ping 192.168.8.2[IP of VLAN 8 on Cisco] & also ping 192.168.0.10[ip of Fe0 on Cisco]

but unable to ping dlink router on 192.168.0.1 & any other devices 192.168.0.0 network other than cisco Fe0 which is 192.168.0.10.

My aim is to reach internet on CentOS vm, IPTABLES & Firewall disabled on CentOS & Hyper-V host.

Please let me know what i am missing, and now i have big doubt if i can achieve my requirement with Cisco 1812-J/K9 device.

Thanks and Regards

Tammali

[paul driver · Accepted solution]

Hello

Can you post the running config of the cisco router please.

in the interim you can try the following:

On the cisco:
ip route 0.0.0.0 0.0.0.0 192.168.0.1 < this is correct as it will the be pointing to the Dlink rtrs Lan facing interface

ip route 192.168.3.0 255.255.255.0 192.168.0.1  <------ Not required, remove it

Now for reachability between your vlan 3 to the dlink rtr you can do a couple of thngs:

1) apply 192.168.3.0 255.255.255.0 192.168.0.10 < on the dlink rtr for return traffic toward your LAN

or

2) Enable Network Translation on the cisco rtr. even though I can see with the addressing at present that the dlink is providing would be already doing NAT

access-list 10 permit 192.168.3.0 0.0.0.255
ip nat source list 10 interface fe0 overload

interface  fe0 and fe3
ip nat enable

For the Hyper v -  the Default-gateway would be 192.168.3.2 <----- this is pointing the L3 svi for vlan 3 on the cisco rtr

res

Paul

[srinivas.tammali]

Hi Paul,

Thanks for the quick response, will try your suggestions, right now i wiped of the config and starting fresh. Will follow your instructions and let you know the results.

Just a quick query; i am unable to enable NAT or assign an ip on Fe3 interface and the cli response is that ip cannot be assigned on L2 Links and for IP NAT ENABLE while i am in Fe3 interface the command doesn't exist.

I can do both the things for Fe0 and Fe1 and just a reminder, Fe0 and Fe1 are called WAN ports in CISCO 1812-J and Fe2 to Fe9 are called Ethernet or LAN ports. I am confused with these WAN and LAN ports. 

I can configure Sub Interfaces on Fe0 and Fe1 and i cannot do the same on LAN ports.

Also Dlink router doesn't have option to configure NAT. 

[srinivas.tammali]

Hi Paul,

Thanks a ton for your help, its resolved and working as expected. I got one VM on 1 VLan communicating with external world.... 

instead of Fe3 i enabled nat for vlan 3 to which fe3 has been configured as switch port.

Can you explain how you derived 10 for Access-list ; or if you can point me to a documents that would also help me.

I am planning to create 4 Vlans out 4 Physical NICs, lets how that goes.

Thanks & Regards

Tammali