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Beginner

[New Office Setup] Routing between ASA Firewall and 1921 Router

Hi All,

Good day, I need help on the new office setup involving routers and firewall. Please see below.

All public Ips here are changed. This is just an example.

 

OLD SETUP: I'm not sure why this is setup this way but Spectrum said that the 51.74.82.x network was a subset and was being forwarded out of the 25.40.117.x network. They use port number 3 on the spectrum modem. It is important to note that the 25.40.117.x only works on that port 3.

 

NEW SETUP: They have recently changed the public IPs assigned to them. Port 3 on spectrum modem will be deactivated which means the 25.40.117.x network will not be used anymore. They will be left with the new set of Public IPs. I don't think spectrum will replace the 25.30.117.x. network. Note that we are now using port 4 on spectrum modem.

Routing

OLD SETUP1.png

 

Everyone's tags (2)
1 ACCEPTED SOLUTION

Accepted Solutions
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VIP Mentor

Re: [New Office Setup] Routing between ASA Firewall and 1921 Router

Hello
On the cisco router you could to bridge its gig0/0 -gig0/1 interfaces using it ip address (109.117.11.x) then your ASA should be able to reach the spectrum


Cisco router
conf t

bridge irb
bridge 1 protocol ieee
bridge 1 route ip

int bvi 1

ip address 109.117.11.x 255.255.255.X

int gig0/0
description to spectrum modem
bridge-group 1

int gig0/1
description to ASA
bridge-group 1



kind regards
Paul

Please rate and mark posts accordingly if you have found any of the information provided useful.
It will hopefully assist others with similar issues in the future

View solution in original post

6 REPLIES 6
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VIP Mentor

Re: [New Office Setup] Routing between ASA Firewall and 1921 Router

Hello,

 

in your drawing it looks like interface GigabitEthernet0/0 on the 1921 router has the same IP address as interface GigabitEthernet1/8 on the ASA ?

Highlighted
Beginner

Re: [New Office Setup] Routing between ASA Firewall and 1921 Router

Oh right, that's a typo. it should be 109.177.11.5. sorry bout that
Highlighted
VIP Mentor

Re: [New Office Setup] Routing between ASA Firewall and 1921 Router

Hello,

 

that is still an invalid IP address,since you are already using the same address space on a different interface and a different device. Post the full configs of the ASA and the 1921.

Highlighted
VIP Mentor

Re: [New Office Setup] Routing between ASA Firewall and 1921 Router

Hello
On the cisco router you could to bridge its gig0/0 -gig0/1 interfaces using it ip address (109.117.11.x) then your ASA should be able to reach the spectrum


Cisco router
conf t

bridge irb
bridge 1 protocol ieee
bridge 1 route ip

int bvi 1

ip address 109.117.11.x 255.255.255.X

int gig0/0
description to spectrum modem
bridge-group 1

int gig0/1
description to ASA
bridge-group 1



kind regards
Paul

Please rate and mark posts accordingly if you have found any of the information provided useful.
It will hopefully assist others with similar issues in the future

View solution in original post

Highlighted
Beginner

Re: [New Office Setup] Routing between ASA Firewall and 1921 Router

This worked! Thank you very much!
Highlighted
VIP Mentor

Re: [New Office Setup] Routing between ASA Firewall and 1921 Router

On a side note, why do you need the router at all ? What else is the router doing ? You might as well connect the ASA and the Spectrum to the switch and have them communicate directly...

 

Maybe I am missing something here...