Re: [squid-users] Very strange problem

On 06 Aug 2001 12:30:09 +1000, Roddy Strachan wrote:
> Hi,
>
> Our proxy/wccp setup has been working fine for a number of years now.
>
> For some reason, it has stopped working today, without anything changed at
> all.
>
> What I have managed to find out from tcpdump and debug logs, is the
> following :
>
> 12:17:43.601737 eth0 < gre-proto-0x883E (gre encap)
> 12:17:43.602104 eth0 < gre-proto-0x883E (gre encap)
> 12:17:43.611881 eth0 < gre-proto-0x883E (gre encap)
> 12:17:43.615020 eth0 < gre-proto-0x883E (gre encap)
> 12:17:43.642575 eth0 < gre-proto-0x883E (gre encap)
>
> Tcpdump output above then i came across
>
> 12:13:47.042691 eth0 > dialup.sx.com.au > gw1.mel.satlink.net.au: icmp:
> dialup.sx.com.au protocol 47 unreachable [tos 0xc0]
>
> Why would it be saying unreachable on port 47?

protocol 47 != tcp or udp port 47.
protocol 47 is the gre protocol... so it looks like dialup.sx.com.au is
filtering their internet traffic, and has included gre in the blocked
protocol types (or has not added it to the allowed traffic rules).
 
> Any ideas as to why this has suddenly happened?

Someone changed something, somewhere on or between the wccp intercepting
router and the proxy server.

> No changes have been made.

Yeah, ok, I'll believe this! :}

Rob
Received on Sun Aug 05 2001 - 21:09:22 MDT