The bug is still valid.

Ubuntu release: Jaunty. pppoeconf version 1.18ubuntu1

Before running "poff -a", a partial excerpt of my iptables rules:

Chain FORWARD (policy ACCEPT)
num  target     prot opt source               destination         
1    TCPMSS     tcp  --  anywhere             anywhere            tcp 
flags:SYN,RST/SYN tcpmss match 1400:1536 TCPMSS clamp to PMTU 
2    TCPMSS     tcp  --  anywhere             anywhere            tcp 
flags:SYN,RST/SYN tcpmss match 1400:1536 TCPMSS clamp to PMTU 
3    ACCEPT     all  --  anywhere             10.0.0.0/24         state 
RELATED,ESTABLISHED 

(Note that the bug is only exhibited when the TCPMSS rule has been
double-inserted.)

After running "poff -a", a partial excerpt:

Chain FORWARD (policy ACCEPT)
num  target     prot opt source               destination         
1    TCPMSS     tcp  --  anywhere             anywhere            tcp 
flags:SYN,RST/SYN tcpmss match 1400:1536 TCPMSS clamp to PMTU 
2    LOG        tcp  --  anywhere             10.0.0.0/24         limit: avg 
3/min burst 5 LOG level warning prefix `Unknown forward TCP: ' 

Note that:
1. one TCPMSS rule is still present
2. the ACCEPT rule at line #3 in the original output has vanished.

Note to triagers: as per my comment in October 2008, if /etc/ppp/ip-
down.d/0clampmss still has the exact line:

iptables -L -n -v --line-numbers | grep "TCPMSS.*$PPP_IFACE.*clamp" |
cut -f1 -d " " | xargs -n1 -r iptables -D FORWARD

then it's extraordinarily unlikely that the bug has magically fixed
itself.

** Changed in: pppoeconf (Ubuntu)
       Status: Incomplete => Confirmed

-- 
pppoeconf's generated /etc/ppp/ip-down.d/0clampmss can remove the wrong 
iptables rules
https://bugs.launchpad.net/bugs/116714
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