Assign 877 a public IP behind an 1841 using FA0 switchport as WAN int (transparent bridging?)
A brief background on why I need to do what I'm doing... We have two Corporate HQ, with two seperate IT departments, and neither one of us has much trust in the other. So, I have to configure two routers for every new branch. I provide the WAN interfaces and then the other IT department logs into their router and establishes a VPN to their HQ, taking a portion of the bandwidth with it.
I am establishing a new branch today. I have configured my 1841 with a T1 link and used Fa0/0 for my LAN. I want to connect their 877 router to Fa0/1 and pass a public IP to it. I have a block of 5 public IPs.
I think what I want to do is called "Transparent Bridging," but really, I have no idea. The 877 won't allow me to configure an IP address on the interface because it is a switchport. So what do I need to do??? If you need any more information or anything, just let me know. I need this up today or my boss is going to realize that I'm not as good as I say I am! Just kidding, but I would love to have this working today. Thank you in advance for any help you can offer.
I don't need to configure anything on the 877 except the WAN link with remote access.
version 12.4 service timestamps debug datetime msec service timestamps log datetime msec no service password-encryption ! hostname Router ! boot-start-marker boot-end-marker ! ! no aaa new-model ip cef ! ! multilink bundle-name authenticated ! ! archive log config hidekeys ! ! interface FastEthernet0/0 no ip address duplex auto speed auto ! interface FastEthernet0/0.10 description MICROS encapsulation dot1Q 10 ip address 10.11.1.254 255.255.255.0 ip nat inside ip virtual-reassembly ! interface FastEthernet0/0.20 description CAMERAS encapsulation dot1Q 20 ip address 10.11.2.254 255.255.255.0 ip nat inside ip virtual-reassembly ! interface FastEthernet0/0.30 description MANAGEMENT encapsulation dot1Q 30 ip address 10.11.3.254 255.255.255.0 ip nat inside ip virtual-reassembly ! interface FastEthernet0/1 no ip address ip nat inside ip virtual-reassembly shutdown duplex auto speed auto ! interface Serial0/0/0 no ip address encapsulation frame-relay IETF frame-relay lmi-type ansi ! interface Serial0/0/0.1 point-to-point ip address x.x.x.137 255.255.255.248 ip nat outside ip virtual-reassembly snmp trap link-status frame-relay interface-dlci 500 IETF ! ip forward-protocol nd ip route 0.0.0.0 0.0.0.0 Serial0/0/0.1 ! ! ip http server ip nat inside source list 1 interface Serial0/0/0.1 overload ! access-list 1 permit 10.11.1.0 0.0.0.255 ! ! control-plane ! ! line con 0 line aux 0 line vty 0 4 login local transport input telnet line vty 5 15 login local transport input telnet ! scheduler allocate 20000 1000 end
Re: Assign 877 a public IP behind an 1841 using FA0 switchport a
Thanks for the fast reply.
Sounds easy enough, but what needs to be configured on the 1841's FA0/1 port though? Just the outside IP that I want to use?
And just an fyi... we order 871's, but Cisco has them on backorder until June!
I configured an interface vlan on the 877... assigned it to Fa0 and created a default route through Fa0. I'm not sure on what access lists or other configuration parameters may be needed to make this work. I haven't been able to find anything on this particular scenario on the web yet. Could I request that someone guide me on how they would have this configured?
The 1841 has a WAN ip of x.x.x.137 /29.
I want the 877 to have a WAN ip of x.x.x.138 /29.
I suppose the 1841 would just be acting like a "next hop" to the internet... I realize this isn't an ideal situation or configuration. And that it may seem odd that I am configuring these particular devices in this way, but, its what I have to work with for now. Please advise. Thank you.
We are pleased to announce availability of Beta software for 16.6.3. 16.6.3 will be the second rebuild on the 16.6 release train targeted towards Catalyst 9500/9400/9300/3850/3650 switching platforms. We are looking for early feedback from custome...