topic Re:cisco 891 interface routing in Routing and SD-WAN

cisco 891 interface routing

galaxy1983 — Tue, 05 Mar 2019 03:35:00 GMT

Hi all..

I'm having some trouble configuring porting between interfaces.

Here is my situation.

I have a Cisco 891 router. What I need is to create 3 interfaces with the next IPs:

1. Port FastEthernet 8 - 20.40.1.1 - with a modem connected directly to it - 20.40.1.2

2. Port GigabitEthernet 0 - 193.2.5.100 - connected to a switch - LAN

3. Ports FastEthernet 0 and 1 for two VOIP phones - 190.168.5.2 and 190.168.5.3 - will be switchported to VLAN 10 - 190.168.5.1

I can send ping from a PC (193.2.5.1) to the modem interface (20.40.1.1) but not to the modem itself (20.40.1.2).

I played days with configurations and tried a lot of variation of ip routing and access-lists with no success.

Basically I need to comunicate freely betwin all the devices.

There are a lot of forums providing solutions to a same problems but they seems not working with the 891 router.

Can anyone show me the way, assuming I have a factory resetted router?

Edit:

Here my configurations:

interface FastEthernet0

no ip address

interface FastEthernet1

no ip address

interface FastEthernet2

no ip address

interface FastEthernet3

no ip address

interface FastEthernet4

no ip address

interface FastEthernet5

no ip address

interface FastEthernet6

no ip address

interface FastEthernet7

no ip address

interface FastEthernet8

ip address 20.40.1.1 255.255.255.0

duplex auto

speed auto

interface GigabitEthernet0

ip address 193.2.5.100 255.255.255.0

duplex auto

speed auto

interface Vlan1

no ip address

interface Async1

no ip address

encapsulation slip

ip forward-protocol nd

no ip http server

no ip http secure-server

control-plane

mgcp profile default

line con 0

line 1

modem InOut

stopbits 1

speed 115200

flowcontrol hardware

line aux 0

line vty 0 4

transport input all

end

Message was edited by: galaxy1983

Re: cisco 891 interface routing

paolo bevilacqua — Sat, 13 Apr 2013 14:04:01 GMT

You need to set an address to VLAN 1.

Re:cisco 891 interface routing

SOcchiogrosso — Sun, 14 Apr 2013 01:03:26 GMT

Does the modem have a route back to your network?

Sent from Cisco Technical Support Android App

Re:cisco 891 interface routing

galaxy1983 — Sun, 14 Apr 2013 06:56:07 GMT

Why would I need to do that?

Re:cisco 891 interface routing

galaxy1983 — Sun, 14 Apr 2013 06:57:32 GMT

Yes

Re:cisco 891 interface routing

paolo bevilacqua — Sun, 14 Apr 2013 11:15:23 GMT

galaxy1983 wrote:

Why would I need to do that?

Because it's needed.

Re:cisco 891 interface routing

Sam Smiley — Sun, 14 Apr 2013 14:14:40 GMT

I am not familiar with the 891 that you show here; however it is common practice on the lower end routers that all of the faX ports are switchports, not L3 ports. As mentioned before you will need to add a VLAN1 address; this will assign a network to FastErthernet0 - 8. If by some chance this router does support L3 ports you will be able to issue a "no switchport" command on the interface to turn it into a L3 port prior to assigning the IP address.

These routers are designed for two destinct networks, gi0 (WAN) and VLAN1 (LAN). You can not add a 3rd routed interface to them. In order for the is work you would need to move to a modular router.

Cheers,

Sam

Re: Re:cisco 891 interface routing

chad patterson — Wed, 10 Oct 2018 21:02:34 GMT

What's needed is an explanation.

Re: cisco 891 interface routing

Alex Pfeil — Wed, 10 Oct 2018 21:05:35 GMT

Port GigabitEthernet 0 - 193.2.5.100 - connected to a switch - LAN

Did you account for 193.2.5.100 being a public IP address? You should use private IP addresses for local LAN.

Please mark helpful posts.

Re: cisco 891 interface routing

Alex Pfeil — Wed, 10 Oct 2018 21:10:14 GMT

You need to configure NAT on the outside and inside interfaces. You can then use your public IP address and port-address translation out to the internet.

outside interface command

ip nat outside

inside interface command

ip nat inside

Create an ACL to match traffic.

access-list 1 permit any

Associate the ACL to the NAT

ip nat inside source list 1 interface "interface" overload

In you configuration above, fastethernet 8 is the port.

You would then need to have a default static route out to the internet.

ip route 0.0.0.0 0.0.0.0 20.40.1.2

Please mark helpful posts.