Re: [lwip-users] IPv6 MTU vs IPv4 MTU

2017-09-06 Thread goldsi...@gmx.de
Raphael Zulliger wrote: I'd like to stress again that both, the mentioned Ubuntu and a Windows 10 system respect different MTUs for IPv4 and IPv6 That was clear from the first mail. Maybe it got clear from my mail, that I wanted to know what are the downsides of our behaviour. I failed to

Re: [lwip-users] IPv6 MTU vs IPv4 MTU

2017-09-06 Thread Raphael Zulliger
Thanks for your replies. I'd like to stress again that both, the mentioned Ubuntu and a Windows 10 system respect different MTUs for IPv4 and IPv6 in my case, as shown by Wireshark. I.e. Sending UDP frames, it behaves like this: - IPv4: Frames are being fragmented starting from 1473 Bytes

Re: [lwip-users] IPv6 MTU vs IPv4 MTU

2017-09-05 Thread Joel Cunningham
Sent from my iPad > On Sep 4, 2017, at 13:48, "goldsi...@gmx.de" wrote: > > Raphael Zulliger wrote: >> What do you think? Have I found a bug and shall I open a bug report or >> am I wrong? > > I'm not really sure. After all, the MTU is what a network can send. Having a >

Re: [lwip-users] IPv6 MTU vs IPv4 MTU

2017-09-04 Thread goldsi...@gmx.de
Raphael Zulliger wrote: What do you think? Have I found a bug and shall I open a bug report or am I wrong? I'm not really sure. After all, the MTU is what a network can send. Having a different MTU for IPv4 and IPv6 doesn't make much sense to me? Simon

[lwip-users] IPv6 MTU vs IPv4 MTU

2017-09-04 Thread Raphael Zulliger
Hi The following findings and statements are mostly based on observation and I'm not an IP guru, so take the following with a grain of salt. Having, among others, IPv6 and LWIP_ND6_ALLOW_RA_UPDATES enabled, an "IPv6 router advertisement" that specifies an MTU causes LWIP to update its