On 05/04/18 19:20, Ryan Harris via mailop wrote: > If we advertised (announced) IP space with a /20 CIDR via BGP for > months, then stopped that advertisement for 7 days and re-advertised > but with 2 different /21 CIDR ranges, would this produce a negative > effect to our IPs reputation? > > I would think that due to the previous /20 range being advertised > (announced) on BGP this would be a moot issue, but wanted to reach out > and inquire if the change in CIDR or the blackout 7 day period of no > announcement would cause any issues with our reputation or acceptance > of email from those IP ranges. >
I've no idea about the reputation ideas, but I'm just thinking in terms of network. Are you getting another AS number? Do you have any connectivity between the 2 places where you are announcing the /21? You could announce the /20 from both sides as well as the /21. In theory, the most specific (/21) will win. You might get some traffic into the `wrong` site, but if you have a link between, you can deliver it back. Tim
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