[squid-users] problem on transparent proxy with ip_gre

I'm a university student which want to use squid cache and WCCPV2
with my department's router. I've follow
http://www.squid-cache.org/mail-archive/squid-users/199910/0480.html
  
When I dump package from gre1 it has error below
# tcpdump -i gre1
tcpdump: WARNING: arptype 778 not supported by libpcap - falling back
to cooked socket
tcpdump: listening on gre1
20:08:10.582724 bad-hlen 0
20:08:13.215122 bad-hlen 0
20:08:13.577957 bad-hlen 0
20:08:19.578355 bad-hlen 0
  
what's wrong.
Thank
Nont

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