At Fri, 7 Dec 2018 08:48:36 -0800, Warren Kumari <war...@kumari.net> wrote:
> > * Jakob Dhondt: > > > > > I have just noticed that when using dig (different versions) on Mac OS > > > (High Sierra) over IPv6 the source port is not randomized. > > > Hmmm. I’d never noticed that, but I certainly wouldn’t have expected it - > I’m also wondering *how* it is doing this — to increment by 2 it sounds > like there is state being kept - perhaps dig simply relies on the kernel > for the source port and isn’t randomizing at all ( and so the difference is > actually OS difference, and not dig differences? dig directly uses a lower-level network API and handles anything above it by itself (I guess that's because it wants to handle some invalid cases like QID mismatch), so it's not surprising that it simply leaves things like port randomization to the OS kernel. I don't know if it intentionally skips randomization, though - probably not, but that doesn't matter much in practice either. -- JINMEI, Tatuya
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