netfilter buglog - Mar 2012 - [Bug 779] New: Netfilter on bridge interface containing a defective NIC

http://bugzilla.netfilter.org/show_bug.cgi?id=779

           Summary: Netfilter on bridge interface containing a defective
                    NIC
           Product: netfilter/iptables
           Version: unspecified
          Platform: i386
        OS/Version: All
            Status: NEW
          Severity: major
          Priority: P5
         Component: bridging
        AssignedTo: netfilter-buglog at lists.netfilter.org
        ReportedBy: calebc2099 at yahoo.com
   Estimated Hours: 0.0


If a physical ethernet interface is administratively prevented from rx or tx
checksum offloading due to a defect in the NIC 

eg: ethtool --offload eth2 rx off

and the NIC participates in a bridge interface

eg: br0 = eth1,eth2

Netfilter appears to causes rx or tx checksum offloading on all NICs
participating in the bridge interface resulting in corrupted packets.

eg: iptables -t nat -A POSTROUTING -o eth0 -j MASQUERADE

configuration used for examples:

eth0 - Internet interface
br0 = eth1,eth2 - Local interface

eth0 NIC = Intel
eth1 NIC = Intel
eth2 NIC = Realtek R8111D

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