Yeah a router only knows the next hop for a packet not the sequence of
hops it took to get where it is. Consequently if you pick any two
Internet connections and tracert the path in both directions there's a
very strong chance the path is asymmetric. It's normal and ok. Or in
other words, it's ok as long as one path isn't weaker than the other.
I've had one or two LAN weenies talk to me about an asymmetric routing
"issue", and I just smile and nod and go hunt for the real problem.
On 10/15/2019 2:02 PM, Steve Jones wrote:
Normally no issue, the interwebs is asymmetric as it was pointed out
to me. every time ive come across an issue i suspected was related to
asymmetry it ended up being something else, like MTU somewhere. We
still have split prefixes between providers and some on both. Moving
the customer lo a locked one resolves, moving to other resolves, but
then it ends up being something unrelated. Assuming both upstream are
sufficient for performance
On Tue, Oct 15, 2019 at 12:55 PM Ken Hohhof <af...@kwisp.com
<mailto:af...@kwisp.com>> wrote:
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.
--
AF mailing list
AF@af.afmug.com <mailto:AF@af.afmug.com>
http://af.afmug.com/mailman/listinfo/af_af.afmug.com
--
AF mailing list
AF@af.afmug.com
http://af.afmug.com/mailman/listinfo/af_af.afmug.com
