12-11-2019 06:53 AM
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
Solved! Go to Solution.
12-11-2019 08:55 AM - edited 12-12-2019 12:30 AM
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
12-11-2019 08:05 AM
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 ?
12-11-2019 08:07 AM
12-11-2019 12:24 PM
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.
12-11-2019 08:55 AM - edited 12-12-2019 12:30 AM
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
12-12-2019 11:47 AM
12-12-2019 12:25 PM
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...
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