netfilter buglog - Sep 2006 - [Bug 519] New: failed to forward packets via some interface

https://bugzilla.netfilter.org/bugzilla/show_bug.cgi?id=519

           Summary: failed to forward packets via some interface
           Product: netfilter/iptables
           Version: linux-2.6.x
          Platform: mips
        OS/Version: other
            Status: NEW
          Severity: critical
          Priority: P2
         Component: NAT
        AssignedTo: laforge@netfilter.org
        ReportedBy: raymond1860@gmail.com


Now we are testing a adsl box based broadcom's 6348 (kernel 2.6.8.1).
Initialy,everything is ok,After long time working with heavy traffic(the time
varies from several hours to several days),the box can't forward pacekts via
the adsl/atm port.
Infomation:
  iptables/netfilter/masquerade/dnat
  pppoe link
  mips cpu 240Mmips
when the box is down,we can't get any traffic from adsl/atm/pppoe interface
(everything via eth0/br0 is still very ok).we have to break down pppd daemon
(lower link is down and lcp start to terminate),and pppd try to reconnect after 
we put lower link up.Now everything is ok.
I don't know how to start to debug .So I report this bug here to get help.

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