So here is something new. Recently I have had problems with some web sites
not loading properly on any browser (safari, chrome, firefox all same
problem). It was rare but I found a web page that consistently failed so
started to investigate.
I traced the problem to the MTU size on my wired network. I had set my
iMac wired ethernet to use jumbo frames (9000 bytes). I discovered that if
I set it to use standard frames (1500 bytes) then everything worked fine.
Playing with custom sizes it would work at 3000 but not higher.
So I looked at my astlinux box and found that all network interfaces were
set to 1500. I decided to change my internal interfaces to 9000...
ifconfig eth1 mtu 9000
ifconfig eth2 mtu 9000
ifconfig br1 mtu 9000
I bridge eth1/2 into br1 so assumed that I needed to set all three to
9000. I left eth0 which connects to comcast/internet at 1500.
Then I set the iMac network back to 9000 byes and low-and-behold everything
works properly.
Now I would have expected the network to negotiate a common frame size
between interfaces but apparently something is not working right in that
area and I don't know whether to point the finger at Apple or astlinux
(r8168 driver) but as the above works I'm happy to configure MTU size on
the astlinux net interfaces.
Now I have not rebooted astlinux since making the change but assume that
the network interfaces will reset to 1500. So now the question is can I
specify a default MTU size somewhere that will be set on boot? I don't
want to change my iMac MTU size because I need fast transfers of very large
files to a NAS box I have on my network.
Thanks,
David
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