Zitat von "Aleksey Ilyushin" <[EMAIL PROTECTED]>:
> I tried to reproduce the problem with a similar setup: XP guest via
> Linux host (with MTU 1492) to OS X machine with Windows shares.
> Writing to the Windows shared folders produces packets of 1506 bytes,
> so everything works as it should. Could you restore back the smaller
> MTU on your Linux host and try 'ping -f -l 1472
> <ip_addr_of_win_share_machine>' from W2K guest? You should get
> something like this:
>
> Pinging 10.88.1.2 with 1472 bytes of data:
>
> Reply from 192.168.100.100: Packet needs to be fragmented but DF set.
> Packet needs to be fragmented but DF set.
> Packet needs to be fragmented but DF set.
> Packet needs to be fragmented but DF set.
Hmm, it were test like this that brought me on the MTU track. ;-)
Tried it again:
Set MTU to 1492 on all interfaces on the Linux host.
Abbreviated ifconfig output:
br0 Link encap:Ethernet HWaddr 00:16:17:f0:d8:44
inet addr:192.168.1.32 Bcast:192.168.1.255 Mask:255.255.255.0
UP BROADCAST RUNNING MULTICAST MTU:1492 Metric:1
eth1 Link encap:Ethernet HWaddr 00:16:17:f0:d8:44
UP BROADCAST RUNNING MULTICAST MTU:1492 Metric:1
vbox1 Link encap:Ethernet HWaddr 00:ff:37:a2:fb:04
UP BROADCAST RUNNING MULTICAST MTU:1492 Metric:1
eth1: real interface, br0: brigde, vbox1: VBox HostInterface
ping -f -l 1472 works with the Linux host itself, but with none other
hosts on my network. No replies there, only timeouts. ifconfig vbox1
reports some dropped Tx packets.
When I set every MTU to 1500, I get the ping output about "fragmented
packets" with larger ping block sizes.
> If there are no replies at all then, most probably, your Linux host
> acts as a "black hole" router which prevents proper path MTU discovery.
So it looks like. Any ideas how to tell my Linux not to do that ??
Regards, J.Roderburg
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