On 30/09/17 10:56, Troy Telford wrote:
I’m fairly sure that the firewall is configured to pass the ICMPv6
messages from any interface to any interface - Clients inside the
network are definitely seeing “packet too big” messages.
So is there something in Squid which could be causing my path MTU
issues? Is there anything i can do to eliminate Squid as a source of error?
Squid just schedules data for TCP to deliver and lets the OS handle the
details. Sounds to me like your TCP stack is not handling those ICMP MTU
responses correctly.
IIRC the kernel versions 2.6.32-2.6.36 were found to have issues with
their ICMP. But those got resolved.
Amos
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