On Mon, 18 May 2009 15:04:59 +0200, Aleksandar Ivanisevic
<[email protected]> wrote:
> Hi,
>
> by the way, has anyone else noticed google not letting "weird" MTUs
> through since that outage?
>
> I'm going to the internet via a PPPoE link over VLAN so my MTU is 1488
> instead of 1492 or 1500, and google seems not to grok that any more.
> I had to lower down mtu to 1300 to make google work again. IPs not
> working all seem to be in or around the 74.125.39.0/24 netblock.
This seems like a Path MTU Discovery issue. (not specifically Google)
MTU is not known past your physical interface.
Try turning off Path MTU Discovery and putting your MTU back at 1488.
(This is not really a solution, but a test.)
You can try pinging with larger and larger packet sizes to see what
router is dropping on the larger packet size, without returning an
ICMP.
--
END OF LINE
--MCP
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