network help

[oriagranat9]

hey i recently upgraded my network to a 100mb and with that i got a new modem but since then i cant port anything and i have a wierd issue with my external ip adress please help

[jfael]

It sounds like your internet provider has implemented a CGNAT (Carrier Grade Network Address Translation) solution in their network.

 

CGNAT is basically the same principle that your home router/modem has, where usually is has one public IP address that is shared between all the devices on your home network, however on a much larger scale.

 

If this is in fact the case, I don't know of anything you can do besides, calling your service provider to see if they can give you a public IP instead of a private one.

[oriagranat9]

ok thank you

[XYrZbest]

it just looks like you are using a different ip arrangement lets call it like 192.168  or 10.0 but in this case 100.100 you should be able to change it but that one that starts with 100.100 looks like an internal IP while the one from your browser is the external

[Neil]

it just looks like you are using a different ip arrangement lets call it like 192.168 or 10.0 but in this case 100.100 you should be able to change it but that one that starts with 100.100 looks like an internal IP while the one from your browser is the external

100.100.0.0/16 is a public address space. The only private/internal spaces are 10.0.0.0/8, 172.16.0.0/12, and 192.168.0.0/16.

This particular range (100.64.0.0/10) is what's known as a Shared Address Space block. From ARIN/IANA: "Shared Address Space can only be used in Service Provider networks or on routing equipment that is able to do address translation across router interfaces when addresses are identical on two different interfaces."

@jfael is 100% correct. OP's ISP is using CGNAT.

Links:

https://tools.ietf.org/html/rfc6598

https://en.wikipedia.org/wiki/Carrier-grade_NAT

http://whois.arin.net/rest/net/NET-100-64-0-0-1/pft

Edit: mislabeled the 172.16.0.0/12 as a /16

[XYrZbest]

100.100.0.0/16 is a public address space. The only private/internal spaces are 10.0.0.0/8, 172.16.0.0/16, and 192.168.0.0/16.

 

This particular range (100.64.0.0/10) is what's known as a Shared Address Space block. From ARIN/IANA: "Shared Address Space can only be used in Service Provider networks or on routing equipment that is able to do address translation across router interfaces when addresses are identical on two different interfaces."

 

@jfael is 100% correct. OP's ISP is using CGNAT.

 

Links:

 

https://tools.ietf.org/html/rfc6598

https://en.wikipedia.org/wiki/Carrier-grade_NAT

http://whois.arin.net/rest/net/NET-100-64-0-0-1/pft

oh ok

[.:MARK:.]

100.100.0.0/16 is a public address space. The only private/internal spaces are 10.0.0.0/8, 172.16.0.0/16, and 192.168.0.0/16.

 

This particular range (100.64.0.0/10) is what's known as a Shared Address Space block. From ARIN/IANA: "Shared Address Space can only be used in Service Provider networks or on routing equipment that is able to do address translation across router interfaces when addresses are identical on two different interfaces."

 

@jfael is 100% correct. OP's ISP is using CGNAT.

 

Links:

 

https://tools.ietf.org/html/rfc6598

https://en.wikipedia.org/wiki/Carrier-grade_NAT

http://whois.arin.net/rest/net/NET-100-64-0-0-1/pft

 

You sure it's not CIDR /8 /12 and /16 for A, B and C private IP space?

[Neil]

You sure it's not CIDR /8 /12 and /16 for A, B and C private IP space?

Oops. That was a mistype. Thanks.

[techguru]

you got a isp modem..and a router

bridge the isp modem to the router

and it should give you a proper ip

[oriagranat9]

that's whats i did but i still get 2 different ip addresses 

[jfael]

You have a modem AND a router ?

 

I may have misunderstood your setup.

 

What kind of service do you have? Cable, DSL, Fiber ?

 

If you have both a modem and a router, what I said before might not be the case and what @techguru said makes more sense.

 

Can you connect to the modem and check what IP it's getting from the service provider ?

If it's the same as what is being reported by "whats my ip", then it should be just a matter of configuring the modem in bridge mode like @techguru said, so that the public IP is given to the router instead of the modem.

[Neil]

You have a modem AND a router ?

I may have misunderstood your setup.

What kind of service do you have? Cable, DSL, Fiber ?

If you have both a modem and a router, what I said before might not be the case and what @techguru said makes more sense.

Can you connect to the modem and check what IP it's getting from the service provider ?

If it's the same as what is being reported by "whats my ip", then it should be just a matter of configuring the modem in bridge mode like @techguru said, so that the public IP is given to the router instead of the modem.

I doubt this is the case, but I guess it's possible. Seeing as the IP he's getting from his router is a CGNAT block..