On Mon, 30 Apr 2007 09:29:56 -0700 [EMAIL PROTECTED] wrote: > http://bugzilla.kernel.org/show_bug.cgi?id=8409 > > Summary: e1000 : checksum incorrect for eth0 but not for ppp0 > packets > Kernel Version: 2.6.20-gentoo-r7 > Status: NEW > Severity: normal > Owner: [EMAIL PROTECTED] > Submitter: [EMAIL PROTECTED] > > > Most recent kernel where this bug did *NOT* occur: > Distribution: Gentoo (stale) > Hardware Environment: ThinkPad T41 > Software Environment: Linux n22 2.6.20-gentoo-r7 #4 Sun Apr 29 14:05:29 CEST > 2007 i686 Intel(R) Pentium(R) M processor 1700MHz GenuineIntel GNU/Linux > > Problem Description: > I'm wondering why the network packets I got from my ADSL line are ok from the > ppp0 interface but often have incorrect checksums if I sniff them at the eth0 > interface (using wireshark). > > Although the amount of the affected packets are reduced from kernel version > 2.6.1[89] to the current kernel the problem still happens at least for all UDP > Microsoft messenger packets and for some other TCP packets too. > > The problem can be seen in the 2 attached pcap files I sniffed with tcpdump at > the same time, the 2 command lines at 2 different terminals were : > > n22 ~ # tcpdump -i eth0 -s 0 -w tcpdump_eth0.pcap > n22 ~ # tcpdump -i ppp0 -s 0 -w tcpdump_ppp0.pcap > > Look at packets 2 and 3 of the 2 attached files for the messenger problem and > for packet 23 in tcpdump_eth0.pcap respectivly packet 21 in tcpdump_ppp0.pcap > > The 2nd case prevents the KDE application kgpg to return from a search for a > given gpg key b/c the kde application seems to ignore TCP packets having nota > correct checksum :-( > > > > Might be it has something to do with my current firewall configuration (b/c > here > my reported issue was related rather to the netfilter module than to e1000 > :http://bugzilla.kernel.org/show_bug.cgi?id=7938#c4 ) > > These are the modules I'm using: > n22 ~ # lsmod | grep -e nf_ -e ipt_ -e xt_ > ipt_MASQUERADE 2560 2 > xt_multiport 3136 12 > ipt_REJECT 3392 1 > xt_tcpudp 3264 29 > ipt_recent 7920 6 > nf_conntrack_irc 5732 0 > nf_conntrack_ftp 8288 0 > xt_state 1984 2 > xt_limit 2112 3 > ipt_LOG 5696 3 > nf_nat 14444 2 ipt_MASQUERADE,iptable_nat > nf_conntrack_ipv4 12492 4 iptable_nat > nf_conntrack 46888 7 > ipt_MASQUERADE,nf_conntrack_irc,nf_conntrack_ftp,xt_state,iptable_nat,nf_nat,nf_conntrack_ipv4 > x_tables 11716 10 > ipt_MASQUERADE,xt_multiport,ipt_REJECT,xt_tcpudp,ipt_recent,xt_state,xt_limit,ipt_LOG,iptable_nat,ip_tables > >
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