SG-300 as Layer 2 - can it distribute delegated /64 IPv6 addresses as a DHCPv6 server from Comcast?
Configure SG-300 to dole out IPv6 addresses from a delegated /64 dynamic IPv6 address space. Or to dole out delegated /64 IPv6 address spaces after acquiring a delegated /60 IPv6 space.
- Can the SG-300 be configured as the DHCPv6 server to dole out /64 dynamic IPv6 addresses?
- How do I interrogate the Comcast network to get the necessary configuration parameters (e.g., where the SG-300 is to go to request the delegated /64 dynamic IPv6 address space ?
I have a small business account with Comcast that gives me 5 routable IPv4 addresses, and what looks to be a single IPv6 with a delegated /64 prefix. All routable IPv4 and IPv6 addresses are dynamic, not static from Comcast . The routable /64 IPv6 delegated address space from Comcast is currently 2601:2:5a80:2a3::
What follows is the topology to make clear the SG-300 is the gateway for each of the three attached firewalls (named by manufacturer) which are NATing all IPv4 devices connected behind them:
WAN <——> SB6120 <— Cisco SG-300 Layer2 Switch <—|—> company1.org
The SG-300 is configured for Layer 2 with a single VLAN. Each of the physically connected firewalls are isolated via the "Protected" port setting on the SG-300.
At present, the IPv6 address is flowing through by default, but the first firewall to acquire the delegated /64 address space holds it -- to the exclusion of the other connected devices. Thus, my goal is to move the request for the delegated /64 IPv6 address space back to the SG-300 and have it dole out the IPv6 assignments. OR, to ask Comcast for a /60 delegated IPv6 address space by the SG-300 and thence, the SG-300 re-delegates individual /64 IPv6 address to the firewalls.
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