One /22 Two ISP no BGP

Anton Kapela tkapela at
Sat Feb 14 08:25:29 UTC 2009

If all else fails, you could setup a pair of static IPIP or GRE
tunnels using the static provider-assigned address on your link into
the non-bgp speaking provider. Then, terminate the 'far side' of the
tunnel on a router collocated somewhere upstream of if the brain-dead
provider. This would get you a 'unicast overlay' across the brain-dead
reseller of the transit to a router where you could speak bgp
to real-er transits providers, peers, or others networks.

If you had the luxury of a cisco 720x/7301 pair (for your local router
and upstream tunnel endpoint), you could take advantage of the
transparent ip fragmentation and virtual-reassembly in 12.4, ip tcp
mss 'adjustment' (to handle the 20+ bytes of lost MTU via the tunnel),
and some shaping/fancy-QoS for making the (likely) congested-as-heck
path in or out of this network a bit less horrible for end-users.



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