[LARTC] Error in "15.10 Example of full nat solution with QoS"?

[LARTC] Error in "15.10 Example of full nat solution with QoS"?

[Sean Dwyer]

Near the end of section 15.10, the following commands are shown for prioritizing SYN packets:

   iptables -t mangle -I PREROUTING -p tcp -m tcp --tcp-flags SYN,RST,ACK SYN -j MARK --set-mark 0x1
   iptables -t mangle -I PREROUTING -p tcp -m tcp --tcp-flags SYN,RST,ACK SYN -j RETURN

Shouldn't the "-I" option really be "-A"? Like so:

   iptables -t mangle -A PREROUTING -p tcp -m tcp --tcp-flags SYN,RST,ACK SYN -j MARK --set-mark 0x1
   iptables -t mangle -A PREROUTING -p tcp -m tcp --tcp-flags SYN,RST,ACK SYN -j RETURN

Won't using "-I" cause these entries to be inserted at the top of the chain, putting the RETURN before the MARK is set? Maybe I'm missing something.

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Re: [LARTC] Error in "15.10 Example of full nat solution with QoS"?

[Sean Dwyer]

On Wednesday 05 October 2005 18:30, Sean Dwyer wrote:
> Near the end of section 15.10, the following commands are shown for prioritizing SYN packets:
> 
>   iptables -t mangle -I PREROUTING -p tcp -m tcp --tcp-flags SYN,RST,ACK SYN -j MARK --set-mark 0x1
>   iptables -t mangle -I PREROUTING -p tcp -m tcp --tcp-flags SYN,RST,ACK SYN -j RETURN
> 
> Shouldn't the "-I" option really be "-A"? Like so:
> 
>   iptables -t mangle -A PREROUTING -p tcp -m tcp --tcp-flags SYN,RST,ACK SYN -j MARK --set-mark 0x1
>   iptables -t mangle -A PREROUTING -p tcp -m tcp --tcp-flags SYN,RST,ACK SYN -j RETURN
> 
> Won't using "-I" cause these entries to be inserted at the top of the chain, putting the RETURN
> before the MARK is set? Maybe I'm missing something.

Does anybody who maintains lartc.org read this mailing list?

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Re: [LARTC] Error in "15.10 Example of full nat solution with QoS"?

[Andy Furniss]

Sean Dwyer wrote:
> On Wednesday 05 October 2005 18:30, Sean Dwyer wrote:
> 
>>Near the end of section 15.10, the following commands are shown for prioritizing SYN packets:
>>
>>  iptables -t mangle -I PREROUTING -p tcp -m tcp --tcp-flags SYN,RST,ACK SYN -j MARK --set-mark 0x1
>>  iptables -t mangle -I PREROUTING -p tcp -m tcp --tcp-flags SYN,RST,ACK SYN -j RETURN
>>
>>Shouldn't the "-I" option really be "-A"? Like so:
>>
>>  iptables -t mangle -A PREROUTING -p tcp -m tcp --tcp-flags SYN,RST,ACK SYN -j MARK --set-mark 0x1
>>  iptables -t mangle -A PREROUTING -p tcp -m tcp --tcp-flags SYN,RST,ACK SYN -j RETURN
>>
>>Won't using "-I" cause these entries to be inserted at the top of the chain, putting the RETURN
>>before the MARK is set? Maybe I'm missing something.
> 
> 
> Does anybody who maintains lartc.org read this mailing list?

I doubt if Bert reads every or maybe any post - I agree about the -I 
being wrong. The LARTC hasn't been changed for a while but will be 
someday I guess. There is going to be a wiki soon - there is already a 
new one for Linux-net http://linux-net.osdl.org/ .

Andy.
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