Re: ICMP tcp port 80 unreachable [tos 0xc0]

If these are true (and not an effect of the measurement) then it
defenitely is a networking problem in the area of Linux transparent
proxy support in the kernel or routing (both Linux and surrounding
routers). Not really a Squid problem. Squid works at the application
level, the kernel and routers works at packet level.

I think it would be wise to get in touch with experts on Linux
networking and transparent proxy kernel support to get an explanation
from where these ICMP messages are generated and why.

--
Henrik Nordstrom
Spare time Squid hacker
Henrique Pantarotto wrote:
> 17:29:17.114694 200.231.199.10 > 200.246.104.30: icmp: 209.216.198.28
> tcp port 80 unreachable [tos 0xc0]
> 
> 200.231.199.10 is the Linux/Squid box.  200.246.104.0/24, 200.231.199.0/24
> and 200.231.184.0/24 are my users.
> 
> Perhaps this forwarding thing doesn't work well with Kernel 2.2.x?  Or
> perhaps other kernel options must be compiled with it.
> 
> Can someone help?  Should I bug the people from the linux-net mailing-list too?