[squid-users] irregular traffic when using proxy, not if NATed

[le dahut]

Hello.

On certain upload websites, the traffic monitor shows an irregular 
traffic when uploading through squid, while uploading NATed (not using 
squid) gives a regular traffic.

Traffic monitoring on the client gives this when using squid :
https://dev-eole.ac-dijon.fr/attachments/download/1978/trafic-en-ligne.ac-aix-marseille.png

And this when connecting directly to the website :
https://dev-eole.ac-dijon.fr/attachments/download/1998/trafic-en-ligne.ac-aix-marseille-NAT.png

"squid.conf" is here :
http://paste.ubuntu.com/23894668/


# squid -v
Squid Cache: Version 3.5.12
Service Name: squid
Ubuntu linux
configure options:  '--build=x86_64-linux-gnu' '--prefix=/usr' 
'--includedir=${prefix}/include' '--mandir=${prefix}/share/man' 
'--infodir=${prefix}/share/info' '--sysconfdir=/etc' 
'--localstatedir=/var' '--libexecdir=${prefix}/lib/squid3' '--srcdir=.' 
'--disable-maintainer-mode' '--disable-dependency-tracking' 
'--disable-silent-rules' 'BUILDCXXFLAGS=-g -O2 -fPIE 
-fstack-protector-strong -Wformat -Werror=format-security 
-Wl,-Bsymbolic-functions -fPIE -pie -Wl,-z,relro -Wl,-z,now' 
'--datadir=/usr/share/squid' '--sysconfdir=/etc/squid' 
'--libexecdir=/usr/lib/squid' '--mandir=/usr/share/man' 
'--enable-inline' '--disable-arch-native' '--enable-async-io=8' 
'--enable-storeio=ufs,aufs,diskd,rock' 
'--enable-removal-policies=lru,heap' '--enable-delay-pools' 
'--enable-cache-digests' '--enable-icap-client' 
'--enable-follow-x-forwarded-for' 
'--enable-auth-basic=DB,fake,getpwnam,LDAP,NCSA,NIS,PAM,POP3,RADIUS,SASL,SMB' 
'--enable-auth-digest=file,LDAP' 
'--enable-auth-negotiate=kerberos,wrapper' 
'--enable-auth-ntlm=fake,smb_lm' 
'--enable-external-acl-helpers=file_userip,kerberos_ldap_group,LDAP_group,session,SQL_session,unix_group,wbinfo_group' 
'--enable-url-rewrite-helpers=fake' '--enable-eui' '--enable-esi' 
'--enable-icmp' '--enable-zph-qos' '--enable-ecap' 
'--disable-translation' '--with-swapdir=/var/spool/squid' 
'--with-logdir=/var/log/squid' '--with-pidfile=/var/run/squid.pid' 
'--with-filedescriptors=65536' '--with-large-files' 
'--with-default-user=proxy' '--enable-build-info=Ubuntu linux' 
'--enable-linux-netfilter' 'build_alias=x86_64-linux-gnu' 'CFLAGS=-g -O2 
-fPIE -fstack-protector-strong -Wformat -Werror=format-security -Wall' 
'LDFLAGS=-Wl,-Bsymbolic-functions -fPIE -pie -Wl,-z,relro -Wl,-z,now' 
'CPPFLAGS=-Wdate-time -D_FORTIFY_SOURCE=2' 'CXXFLAGS=-g -O2 -fPIE 
-fstack-protector-strong -Wformat -Werror=format-security'


Can you help me find out why ?


Regards,
  Klaas