31 Dec
2020
31 Dec
'20
3:04 p.m.
On 31/12/20 8:47 pm, Roland Schwarz via 44Net wrote:
Tony,
On 30.12.20 at 22:28 wrote Tony Langdon via 44Net:
...
Yes, I'm usually on the wrong end of global
RTT delays when using online
services, unless it's a Google or Facebook with a distributed CDN that
has POPs all over the world, so topological routing is an issue of high
importance to me.
Still have to find the /32 somehow. And I still
see a lot of suboptimal
routing happening here, unless there's some other protocol in the core
doing clever routing.
I absolutely agree! What I wanted to point out is that
there might be
basically two expectations about 44 addresses. Topological routing as
you have pointed out is one of it.
Let me elaborate on the second idea: lots of isolated /32 hosts or /28
subnets: Sure, if I need to load the entire routing table to every node,
this will not scale. But a single node will not need the full routing
table typically. Only a few entries are interesting at a single time.
So if you have a dynamic lookup facility of the gateway address, you
could populate your routing tables on demand. This facility could be
realized by means of a distributed hash table, so there is no single
point of failure. And yes the optimal routing is done by the core
internet in such a use case.
That assumes the case of a single device wanting to access the network.
That would also lead to suboptimal routing locally here, because I have
multiple devices on the network (4 or 5 currently on 44.x). There is
one way that could work, using something like ZeroTier to do the "last
mile". That wouldn't give you a /32 address, but instead an address on
a virtual LAN, of a size specified by the network admin. But while
ZeroTier does have a lot of desirable qualities, like working
transparently through NAT (and that can be tweaked), and using the best
route it can find (two ZT hosts on the same physical LAN will quickly
find the direct path between them, and route over that), it doesn't meet
the criteria of running on routers, AFAIK. ZeroTier may be available on
OpenWRT (I don't know if that's the case), but I highly doubt you'd find
it on Cisco. It is available for Linux, Windows, Android and iOS, and
is open source.
I use ZT myself. It allows me to be on the same virtual LAN as my VPSs,
which makes moving data between all sites much easier. And when I
travel, I can connect back here both securely and without worrying what
NAT timeouts will do to idle sessions.
--
73 de Tony VK3JED/VK3IRL
http://vkradio.com