<div>
Rauenpc is correct regarding advertising PA address space to another ISP. It's possible, but not as cut and dry as obtaining AS/block from ARIN.
</div>


Rauenpc is correct regarding advertising PA address space to another ISP. It's possible, but not as cut and dry as obtaining AS/block from ARIN.

<div>
<div class="content wysiwyg-content">
I understand that for BGP, I need to purchase an AS number and a minimum of a class C subnet. &nbsp;This is fine, I know it won't be a problem, but here's my question. &nbsp;Right now I only have one internet circuit, (I'm not doing BGP with them right now, but they can do it). &nbsp;We are bringing in a 2nd ISP who can also do BGP so we will have internet redundancy. &nbsp;My question is do I need a class C subnet from both ISP's? &nbsp;With the ISP I currently have I have a /30 WAN connection, and a /28 public routable IP Block. &nbsp;Any assistance would be greatly appreciated. &nbsp;Thanks. .
</div>
</div>


I understand that for BGP, I need to purchase an AS number and a minimum of a class C subnet.  This is fine, I know it won't be a problem, but here's my question.  Right now I only have one internet circuit, (I'm not doing BGP with them right now, but they can do it).  We are bringing in a 2nd ISP who can also do BGP so we will have internet redundancy.  My question is do I need a class C subnet from both ISP's?  With the ISP I currently have I have a /30 WAN connection, and a /28 public routable IP Block.  Any assistance would be greatly appreciated.  Thanks. .

Using BGP between two Internet Service Providers for internet redundancy

A router is a networking device that forwards data packets between computer networks. Routers perform the "traffic directing" functions on the Internet. The most familiar type of routers are home and small office cable or DSL routers that simply pass data, such as web pages, email, IM, and videos between computers and the Internet. More sophisticated routers, such as enterprise routers, connect large business or ISP networks up to the powerful core routers that forward data at high speed along the optical fiber lines of the Internet backbone. Though routers are typically dedicated hardware devices, use of software-based routers has grown increasingly common.

Routers

Networking software modules are interfaced with a framework implemented on the machine's operating system that implements the networking functionality of the operating system. The best known frameworks are the TCP/IP model and the OSI model. Systems typically do not use a single protocol to handle a transmission. Instead they use a set of cooperating protocols, sometimes called a protocol family or protocol suite.[9] Some of the best known protocol suites include: IPX/SPX, X.25, AX.25, AppleTalk and TCP/IP. Other protocols indirectly related to networking include the hypertext transfer protocol (HTTP) and its related technologies, Dynamic Host Configuration Protocol (DHCP), Domain Name Server (DNS) and other Internet protocols.

Networking Protocols

Cisco PIX is a dedicated hardware firewall appliance; the Cisco Adaptive Security Appliance (ASA) is a firewall and anti-malware security appliance that provides unified threat management and protection the PIX does not. Other Cisco devices and systems include routers, switches, storage networking, wireless and the software and hardware for PIX Firewall Manager (PFM), PIX Device Manager (PDM) and Adaptive Security Device Manager (ASDM).