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When you get an error message about a bad argument, it's usually because
something earlier in the line was missing. So, for example, in the command:
iptables -A OUTPUT -o $INTERNET -p udp \
-s $IPADDR --sport $UNPRIVPORTS \
-d $NAMESERVER --dport 53 \
-m state --state NEW -j ACCEPT
probably one or more of your variables is not defined correctly.
You can use the command:
# sh -x /etc/rc.d/rc.firewalls &> trace
to run the script and find what the error was in interpreting it.
This command will produce a file called 'trace' which will show each command
the way it was interpreted and (because of the '&') will also show the error
messages produced as a result.
That should help you to figure out exactly where the error is coming from.
Good luck Dave! You're starting a fun ride!
----------------
Larry Flathmann
Systems & Data Integrators
www.sdintegrators.com
-----Original Message-----
From: netfilter-admin@lists.netfilter.org
[mailto:netfilter-admin@lists.netfilter.org]On Behalf Of Sundaram
Sent: Wednesday, October 09, 2002 10:55 PM
To: David F. Strauch; netfilter@lists.netfilter.org
Subject: Re: Bad argument `53'
I have this rules set in my firewall, it is working for me.
$IPT -A OUTPUT -o $EXT -p tcp --sport $UNPRI --dport 53 -j ACCEPT
$IPT -t nat -A PREROUTING -i $EXT -d $EXT_IP1 -p tcp --dport 25 -j
DNAT --to $INT_IP1
$IPT -A FORWARD -p tcp --dport 25 -d $INT_IP1 -j ACCEPT
I am also using REdhat 7.3 Kernel 2.4.18-3 and iptables 1.2.7
----- Original Message -----
From: David F. Strauch
To: netfilter@lists.netfilter.org
Sent: Wednesday, October 09, 2002 10:17 PM
Subject: Bad argument `53'
Hello Everyone
By reading New Riders “Linux Firewalls” by Robert L. Ziegler I’m just
starting to study iptables. I have a stand-alone firewall offline and off
the local network running RHL 7.3 with Kernel 2.4.18-3 and iptables 1.2.5.
I’ve just started writing the script to allow DNS Loopkups as a client
with the following:
if [ "$CONNECTION_TRACKING" = "1" ]; then
iptables -A OUTPUT -o $INTERNET -p udp \
-s $IPADDR --sport $UNPRIVPORTS \
-d $NAMESERVER --dport 53 \
-m state --state NEW -j ACCEPT
fi
iptables -A OUTPUT -o $INTERNET -p udp \
-s $IPADDR --sport $UNPRIVPORTS \
-d $NAMESERVER --dport 53 -j ACCEPT
iptables -A INPUT -i $INTERNET -p udp \
-s $NAMESERVER --sport 53 \
-d $IPADDR --dport $UNPRIVPORTS -j ACCEPT
When I execute the script with sh /etc/rc.d/rc.firewalls I receive Bad
argument `53' for every instance of either --dport 53 or --sport 53. I’ve
also tried --destination-port and --source-port with out any success.
Can anyone shed some light on my problem?
Dave
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<DIV>
<DIV><SPAN class=3D281130804-10102002><FONT face=3DArial color=3D#0000ff =
size=3D2>When=20
you get an error message about a bad argument, it's usually because =
something=20
earlier in the line was missing. So, for example, in the=20
command:</FONT></SPAN></DIV>
<DIV><SPAN class=3D281130804-10102002>
<P class=3DMsoNormal=20
style=3D"MARGIN: 0in 0in 0pt; mso-layout-grid-align: none"><SPAN=20
style=3D"FONT-SIZE: 10pt; FONT-FAMILY: 'Courier New'"><FONT =
face=3DArial><SPAN=20
style=3D"mso-spacerun: yes"> </SPAN>iptables -A OUTPUT =
-o=20
$INTERNET -p udp \<o:p></o:p></FONT></SPAN></P>
<P class=3DMsoNormal=20
style=3D"MARGIN: 0in 0in 0pt; mso-layout-grid-align: none"><SPAN=20
style=3D"FONT-SIZE: 10pt; FONT-FAMILY: 'Courier New'"><FONT =
face=3DArial><SPAN=20
style=3D"mso-spacerun: =
yes"> &n=
bsp;=20
</SPAN>-s $IPADDR --sport $UNPRIVPORTS \<o:p></o:p></FONT></SPAN></P>
<P class=3DMsoNormal=20
style=3D"MARGIN: 0in 0in 0pt; mso-layout-grid-align: none"><SPAN=20
style=3D"FONT-SIZE: 10pt; FONT-FAMILY: 'Courier New'"><FONT =
face=3DArial><SPAN=20
style=3D"mso-spacerun: =
yes"> &n=
bsp;=20
</SPAN>-d $NAMESERVER --dport 53 \<o:p></o:p></FONT></SPAN></P>
<P class=3DMsoNormal=20
style=3D"MARGIN: 0in 0in 0pt; mso-layout-grid-align: none"><SPAN=20
style=3D"FONT-SIZE: 10pt; FONT-FAMILY: 'Courier New'"><FONT =
face=3DArial><SPAN=20
style=3D"mso-spacerun: =
yes"> &n=
bsp;=20
</SPAN>-m state --state NEW -j ACCEPT</FONT></SPAN></P>
<P class=3DMsoNormal=20
style=3D"MARGIN: 0in 0in 0pt; mso-layout-grid-align: none"><SPAN=20
style=3D"FONT-SIZE: 10pt; FONT-FAMILY: 'Courier New'"><o:p><SPAN=20
class=3D281130804-10102002><FONT face=3DArial>probably one or more of =
your variables=20
is not defined correctly.</FONT></SPAN></o:p></SPAN></P>
<P class=3DMsoNormal=20
style=3D"MARGIN: 0in 0in 0pt; mso-layout-grid-align: none"><SPAN=20
style=3D"FONT-SIZE: 10pt; FONT-FAMILY: 'Courier New'"><o:p><SPAN=20
class=3D281130804-10102002><FONT =
face=3DArial></FONT></SPAN></o:p></SPAN> </P>
<P class=3DMsoNormal=20
style=3D"MARGIN: 0in 0in 0pt; mso-layout-grid-align: none"><SPAN=20
style=3D"FONT-SIZE: 10pt; FONT-FAMILY: 'Courier New'"><o:p><SPAN=20
class=3D281130804-10102002><FONT face=3DArial>You can use the=20
command:</FONT></SPAN></o:p></SPAN></P>
<P class=3DMsoNormal=20
style=3D"MARGIN: 0in 0in 0pt; mso-layout-grid-align: none"><SPAN=20
style=3D"FONT-SIZE: 10pt; FONT-FAMILY: 'Courier New'"><o:p><SPAN=20
class=3D281130804-10102002><FONT face=3DArial># sh -x =
/etc/rc.d/rc.firewalls=20
&> trace</FONT></SPAN></o:p></SPAN></P>
<P class=3DMsoNormal=20
style=3D"MARGIN: 0in 0in 0pt; mso-layout-grid-align: none"><SPAN=20
style=3D"FONT-SIZE: 10pt; FONT-FAMILY: 'Courier New'"><o:p><SPAN=20
class=3D281130804-10102002><FONT face=3DArial>to run the script and find =
what the=20
error was in interpreting it.</FONT></SPAN></o:p></SPAN></P>
<P class=3DMsoNormal=20
style=3D"MARGIN: 0in 0in 0pt; mso-layout-grid-align: none"><SPAN=20
style=3D"FONT-SIZE: 10pt; FONT-FAMILY: 'Courier New'"><o:p><SPAN=20
class=3D281130804-10102002><FONT face=3DArial>This command will produce =
a file=20
called 'trace' which will show each command the way it was =
interpreted and=20
(because of the '&') will also show the error messages produced as a =
result.</FONT></SPAN></o:p></SPAN></P>
<P class=3DMsoNormal=20
style=3D"MARGIN: 0in 0in 0pt; mso-layout-grid-align: none"><SPAN=20
style=3D"FONT-SIZE: 10pt; FONT-FAMILY: 'Courier New'"><o:p><SPAN=20
class=3D281130804-10102002><FONT =
face=3DArial></FONT></SPAN></o:p></SPAN> </P>
<P class=3DMsoNormal=20
style=3D"MARGIN: 0in 0in 0pt; mso-layout-grid-align: none"><SPAN=20
style=3D"FONT-SIZE: 10pt; FONT-FAMILY: 'Courier New'"><o:p><SPAN=20
class=3D281130804-10102002><FONT face=3DArial>That should help you to =
figure out=20
exactly where the error is coming from.</FONT></SPAN></o:p></SPAN></P>
<P class=3DMsoNormal=20
style=3D"MARGIN: 0in 0in 0pt; mso-layout-grid-align: none"><SPAN=20
style=3D"FONT-SIZE: 10pt; FONT-FAMILY: 'Courier New'"><o:p><SPAN=20
class=3D281130804-10102002><FONT =
face=3DArial></FONT></SPAN></o:p></SPAN> </P>
<P class=3DMsoNormal=20
style=3D"MARGIN: 0in 0in 0pt; mso-layout-grid-align: none"><SPAN=20
style=3D"FONT-SIZE: 10pt; FONT-FAMILY: 'Courier New'"><o:p><SPAN=20
class=3D281130804-10102002><FONT face=3DArial>Good luck Dave! You're =
starting a fun=20
ride!</FONT></SPAN></o:p></SPAN></P>
<P class=3DMsoNormal=20
style=3D"MARGIN: 0in 0in 0pt; mso-layout-grid-align: none"><SPAN=20
style=3D"FONT-SIZE: 10pt; FONT-FAMILY: 'Courier New'"><o:p><SPAN=20
class=3D281130804-10102002><FONT =
face=3DArial></FONT></SPAN></o:p></SPAN> </P>
<P class=3DMsoNormal=20
style=3D"MARGIN: 0in 0in 0pt; mso-layout-grid-align: none"><SPAN=20
style=3D"FONT-SIZE: 10pt; FONT-FAMILY: 'Courier New'"><o:p><SPAN=20
class=3D281130804-10102002><FONT=20
face=3DArial>----------------</FONT></SPAN></o:p></SPAN></P>
<P class=3DMsoNormal=20
style=3D"MARGIN: 0in 0in 0pt; mso-layout-grid-align: none"><SPAN=20
style=3D"FONT-SIZE: 10pt; FONT-FAMILY: 'Courier New'"><o:p><SPAN=20
class=3D281130804-10102002><FONT face=3DArial>Larry=20
Flathmann</FONT></SPAN></o:p></SPAN></P>
<P class=3DMsoNormal=20
style=3D"MARGIN: 0in 0in 0pt; mso-layout-grid-align: none"><SPAN=20
style=3D"FONT-SIZE: 10pt; FONT-FAMILY: 'Courier New'"><o:p><SPAN=20
class=3D281130804-10102002><FONT face=3DArial>Systems & Data=20
Integrators</FONT></SPAN></o:p></SPAN></P>
<P class=3DMsoNormal=20
style=3D"MARGIN: 0in 0in 0pt; mso-layout-grid-align: none"><SPAN=20
style=3D"FONT-SIZE: 10pt; FONT-FAMILY: 'Courier New'"><o:p><SPAN=20
class=3D281130804-10102002><FONT face=3DArial><A=20
href=3D"http://www.sdintegrators.com/";>www.sdintegrators.com</A>=20
</FONT></SPAN></o:p></SPAN></P></SPAN></DIV></DIV>
<BLOCKQUOTE dir=3Dltr style=3D"MARGIN-RIGHT: 0px">
<DIV class=3DOutlookMessageHeader dir=3Dltr align=3Dleft><FONT =
face=3DTahoma=20
size=3D2>-----Original Message-----<BR><B>From:</B>=20
netfilter-admin@lists.netfilter.org=20
[mailto:netfilter-admin@lists.netfilter.org]<B>On Behalf Of=20
</B>Sundaram<BR><B>Sent:</B> Wednesday, October 09, 2002 10:55=20
PM<BR><B>To:</B> David F. Strauch;=20
netfilter@lists.netfilter.org<BR><B>Subject:</B> Re: Bad argument `53' =
<BR><BR></FONT></DIV>
<DIV><FONT face=3DArial size=3D2>I have this rules set in my =
firewall, it is=20
working for me.</FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT> </DIV>
<DIV><FONT face=3DArial size=3D2>$IPT -A OUTPUT -o $EXT -p tcp --sport =
$UNPRI=20
--dport 53 -j ACCEPT</FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT> </DIV>
<DIV><FONT face=3DArial size=3D2>$IPT -t nat -A PREROUTING -i =
$EXT -d=20
$EXT_IP1 -p tcp --dport 25 -j DNAT --to $INT_IP1<BR>$IPT -A =
FORWARD -p=20
tcp --dport 25 -d $INT_IP1 -j ACCEPT</FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT> </DIV>
<DIV><FONT face=3DArial size=3D2>I am also using REdhat 7.3 Kernel =
2.4.18-3 and=20
iptables 1.2.7</FONT></DIV>
<BLOCKQUOTE dir=3Dltr=20
style=3D"PADDING-RIGHT: 0px; PADDING-LEFT: 5px; MARGIN-LEFT: 5px; =
BORDER-LEFT: #000000 2px solid; MARGIN-RIGHT: 0px">
<DIV style=3D"FONT: 10pt arial">----- Original Message ----- </DIV>
<DIV=20
style=3D"BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: =
black"><B>From:</B>=20
<A title=3Ddstrauch@cyberlink.com =
href=3D"mailto:dstrauch@cyberlink.com";>David=20
F. Strauch</A> </DIV>
<DIV style=3D"FONT: 10pt arial"><B>To:</B> <A=20
title=3Dnetfilter@lists.netfilter.org=20
=
href=3D"mailto:netfilter@lists.netfilter.org";>netfilter@lists.netfilter.o=
rg</A>=20
</DIV>
<DIV style=3D"FONT: 10pt arial"><B>Sent:</B> Wednesday, October 09, =
2002 10:17=20
PM</DIV>
<DIV style=3D"FONT: 10pt arial"><B>Subject:</B> Bad argument `53' =
</DIV>
<DIV><FONT face=3DArial size=3D2></FONT><FONT face=3DArial=20
size=3D2></FONT><BR></DIV>
<P class=3DMsoNormal style=3D"MARGIN: 0in 0in 0pt"><FONT =
face=3DArial size=3D2>Hello=20
Everyone</FONT></P>
<P class=3DMsoNormal style=3D"MARGIN: 0in 0in 0pt"><FONT =
face=3DArial=20
size=3D2></FONT> </P>
<P class=3DMsoNormal style=3D"MARGIN: 0in 0in 0pt"><FONT =
face=3DArial><FONT=20
size=3D2>By reading New Riders =93Linux Firewalls=94 by Robert L. =
Ziegler I=92m just=20
starting to study iptables.<SPAN style=3D"mso-spacerun: yes"> =
</SPAN>I=20
have a stand-alone firewall offline and off the local network =
running RHL=20
7.3 with Kernel 2.4.18-3 and iptables 1.2.5.</FONT></FONT></P>
<P class=3DMsoNormal style=3D"MARGIN: 0in 0in 0pt"><FONT =
face=3DArial><FONT=20
size=3D2> <o:p></o:p></FONT></FONT></P>
<P class=3DMsoNormal style=3D"MARGIN: 0in 0in 0pt"><FONT =
face=3DArial size=3D2>I=92ve=20
just started writing the script to allow DNS Loopkups as a client =
with the=20
following:</FONT></P>
<P class=3DMsoNormal style=3D"MARGIN: 0in 0in 0pt"><FONT =
face=3DArial><FONT=20
size=3D2> <o:p></o:p></FONT></FONT></P>
<P class=3DMsoNormal=20
style=3D"MARGIN: 0in 0in 0pt; mso-layout-grid-align: none"><SPAN=20
style=3D"FONT-SIZE: 10pt; FONT-FAMILY: 'Courier New'"><FONT =
face=3DArial>if [=20
"$CONNECTION_TRACKING" =3D "1" ]; then<o:p></o:p></FONT></SPAN></P>
<P class=3DMsoNormal=20
style=3D"MARGIN: 0in 0in 0pt; mso-layout-grid-align: none"><SPAN=20
style=3D"FONT-SIZE: 10pt; FONT-FAMILY: 'Courier New'"><FONT =
face=3DArial><SPAN=20
style=3D"mso-spacerun: yes"> </SPAN>iptables -A =
OUTPUT -o=20
$INTERNET -p udp \<o:p></o:p></FONT></SPAN></P>
<P class=3DMsoNormal=20
style=3D"MARGIN: 0in 0in 0pt; mso-layout-grid-align: none"><SPAN=20
style=3D"FONT-SIZE: 10pt; FONT-FAMILY: 'Courier New'"><FONT =
face=3DArial><SPAN=20
style=3D"mso-spacerun: =
yes"> &n=
bsp;=20
</SPAN>-s $IPADDR --sport $UNPRIVPORTS =
\<o:p></o:p></FONT></SPAN></P>
<P class=3DMsoNormal=20
style=3D"MARGIN: 0in 0in 0pt; mso-layout-grid-align: none"><SPAN=20
style=3D"FONT-SIZE: 10pt; FONT-FAMILY: 'Courier New'"><FONT =
face=3DArial><SPAN=20
style=3D"mso-spacerun: =
yes"> &n=
bsp;=20
</SPAN>-d $NAMESERVER --dport 53 \<o:p></o:p></FONT></SPAN></P>
<P class=3DMsoNormal=20
style=3D"MARGIN: 0in 0in 0pt; mso-layout-grid-align: none"><SPAN=20
style=3D"FONT-SIZE: 10pt; FONT-FAMILY: 'Courier New'"><FONT =
face=3DArial><SPAN=20
style=3D"mso-spacerun: =
yes"> &n=
bsp;=20
</SPAN>-m state --state NEW -j ACCEPT<o:p></o:p></FONT></SPAN></P>
<P class=3DMsoNormal=20
style=3D"MARGIN: 0in 0in 0pt; mso-layout-grid-align: none"><SPAN=20
style=3D"FONT-SIZE: 10pt; FONT-FAMILY: 'Courier New'"><FONT=20
face=3DArial>fi<o:p></o:p></FONT></SPAN></P>
<P class=3DMsoNormal=20
style=3D"MARGIN: 0in 0in 0pt; mso-layout-grid-align: none"><SPAN=20
style=3D"FONT-SIZE: 10pt; FONT-FAMILY: 'Courier New'"><FONT=20
face=3DArial> <o:p></o:p></FONT></SPAN></P>
<P class=3DMsoNormal=20
style=3D"MARGIN: 0in 0in 0pt; mso-layout-grid-align: none"><SPAN=20
style=3D"FONT-SIZE: 10pt; FONT-FAMILY: 'Courier New'"><FONT=20
face=3DArial>iptables -A OUTPUT -o $INTERNET -p udp=20
\<o:p></o:p></FONT></SPAN></P>
<P class=3DMsoNormal=20
style=3D"MARGIN: 0in 0in 0pt; mso-layout-grid-align: none"><SPAN=20
style=3D"FONT-SIZE: 10pt; FONT-FAMILY: 'Courier New'"><FONT =
face=3DArial><SPAN=20
style=3D"mso-spacerun: =
yes"> =20
</SPAN>-s $IPADDR --sport $UNPRIVPORTS =
\<o:p></o:p></FONT></SPAN></P>
<P class=3DMsoNormal=20
style=3D"MARGIN: 0in 0in 0pt; mso-layout-grid-align: none"><SPAN=20
style=3D"FONT-SIZE: 10pt; FONT-FAMILY: 'Courier New'"><FONT =
face=3DArial><SPAN=20
style=3D"mso-spacerun: =
yes"> =20
</SPAN>-d $NAMESERVER --dport 53 -j =
ACCEPT<o:p></o:p></FONT></SPAN></P>
<P class=3DMsoNormal=20
style=3D"MARGIN: 0in 0in 0pt; mso-layout-grid-align: none"><SPAN=20
style=3D"FONT-SIZE: 10pt; FONT-FAMILY: 'Courier New'"><FONT=20
face=3DArial> <o:p></o:p></FONT></SPAN></P>
<P class=3DMsoNormal=20
style=3D"MARGIN: 0in 0in 0pt; mso-layout-grid-align: none"><SPAN=20
style=3D"FONT-SIZE: 10pt; FONT-FAMILY: 'Courier New'"><FONT=20
face=3DArial>iptables -A INPUT<SPAN style=3D"mso-spacerun: =
yes"> </SPAN>-i=20
$INTERNET -p udp \<o:p></o:p></FONT></SPAN></P>
<P class=3DMsoNormal=20
style=3D"MARGIN: 0in 0in 0pt; mso-layout-grid-align: none"><SPAN=20
style=3D"FONT-SIZE: 10pt; FONT-FAMILY: 'Courier New'"><FONT =
face=3DArial><SPAN=20
style=3D"mso-spacerun: =
yes"> =20
</SPAN>-s $NAMESERVER --sport 53 \<o:p></o:p></FONT></SPAN></P>
<P class=3DMsoNormal=20
style=3D"MARGIN: 0in 0in 0pt; mso-layout-grid-align: none"><SPAN=20
style=3D"FONT-SIZE: 10pt; FONT-FAMILY: 'Courier New'"><FONT =
face=3DArial><SPAN=20
style=3D"mso-spacerun: =
yes"> =20
</SPAN>-d $IPADDR --dport $UNPRIVPORTS -j=20
ACCEPT<o:p></o:p></FONT></SPAN></P>
<P class=3DMsoNormal=20
style=3D"MARGIN: 0in 0in 0pt; mso-layout-grid-align: none"><SPAN=20
style=3D"FONT-SIZE: 10pt; FONT-FAMILY: 'Courier New'"><FONT=20
face=3DArial> <o:p></o:p></FONT></SPAN></P>
<P class=3DMsoNormal style=3D"MARGIN: 0in 0in 0pt"><FONT =
face=3DArial size=3D2>When=20
I execute the script with sh /etc/rc.d/rc.firewalls I receive Bad =
argument=20
`53' for every instance of either<SPAN style=3D"mso-spacerun: =
yes"> =20
--</SPAN>dport 53 or --sport 53.<SPAN style=3D"mso-spacerun: =
yes"> =20
</SPAN>I=92ve also tried --destination-port and --source-port with =
out any=20
success.</FONT></P>
<P class=3DMsoNormal style=3D"MARGIN: 0in 0in 0pt"><FONT =
face=3DArial><FONT=20
size=3D2> <o:p></o:p></FONT></FONT></P>
<DIV><SPAN=20
style=3D"FONT-SIZE: 12pt; FONT-FAMILY: 'Times New Roman'; =
mso-fareast-font-family: 'Times New Roman'; mso-ansi-language: EN-US; =
mso-fareast-language: EN-US; mso-bidi-language: AR-SA"><FONT=20
face=3DArial size=3D2>Can anyone shed some light on my=20
problem?</FONT></SPAN></DIV>
<DIV><SPAN=20
style=3D"FONT-SIZE: 12pt; FONT-FAMILY: 'Times New Roman'; =
mso-fareast-font-family: 'Times New Roman'; mso-ansi-language: EN-US; =
mso-fareast-language: EN-US; mso-bidi-language: AR-SA"><FONT=20
face=3DArial size=3D2></FONT></SPAN> </DIV>
<DIV><SPAN=20
style=3D"FONT-SIZE: 12pt; FONT-FAMILY: 'Times New Roman'; =
mso-fareast-font-family: 'Times New Roman'; mso-ansi-language: EN-US; =
mso-fareast-language: EN-US; mso-bidi-language: AR-SA"><FONT=20
face=3DArial=20
size=3D2>Dave</FONT></SPAN></DIV></BLOCKQUOTE></BLOCKQUOTE></BODY></HTML>=
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