4 ms·
These days EDNS0 allows bigger UDP responses in many cases, which may mean some fragment re-assembly. Unfortunately there are a staggering number of networks an
by colmmacc 9y ago
These days EDNS0 allows bigger UDP responses in many cases, which may mean some fragment re-assembly. Unfortunately there are a staggering number of networks and firewalls that don't open TCP 53, and also ones that don't permit UDP fragments. So if you want DNS to work reliably /everywhere/, sadly it's wise to stay below the 512 limit.
- otterley 9y agoWe're talking about service discovery here. This is internal DNS traffic in AWS, where these issues to which you refer are nonexistent.