I have cases where traffic to some customers comes in via upstream provider A but the return traffic exits my network via upstream provider B.
What kind of problems if any can this cause? I have assumed there is no guarantee that upstream and downstream traffic takes the same path across the Internet, even without being dual homed, so this should be fine as long as traffic flows both directions, it shouldn't matter what path it takes. But I'm having to go out to a customer whose kid complains he can't do anything not even websites (but I suspect it comes down to something gaming related) yet their Internet connection appears to be 100% from all my tests and I see them streaming Netflix for hours at a time at 9-10 Mbps. I am hesitant to send a field tech because I don't know what to tell him to do. I'm just inquiring about the asymmetric routing because I'm grasping at straws for what to look for when I'm on site. Did I mention I hate the divorced parent situation where the dad gets the kid X days a week and every other weekend, and all the kid does is play online games and bitch that the Internet isn't as good as at the other parent's house? But in this case he's claiming it just flat out doesn't work, and the dad doesn't know anything.
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