Default Mangle Table

[Denna]

With a default installation of Asuswrt-Merlin 380.65 beta, the following appears in the mangle table.

: PREROUTING ACCEPT [4195:1410662]
:INPUT ACCEPT [1854:271614]
:FORWARD ACCEPT [2341:1139048]
:OUTPUT ACCEPT [1975:438475]
: POSTROUTING ACCEPT [4324:1577779]
:BWDPI_FILTER - [0:0]
-A PREROUTING -d 192.168.42.94/32 ! -i usb0 -j MARK --set-xmark 0x8000/0x8000
​

Is the first value in brackets the number of packets that have passed through PREROUTING and the second value the amount of data through PREROUTING ?

What is the BWDPI_FILTER chain for ?

What is the iptables rule accomplishing ?

 

[ColinTaylor]

http://www.iptables.info/en/iptables-save-restore-rules.html#IPTABLES-SAVE

https://www.snbforums.com/threads/default-filter-table.37064/

https://www.netfilter.org/documentation/

 

[Denna]

The values in the brackets are just realtime statistics of traffic passing through those chains.

I still haven't figured out what the "BWDPI_FILTER" is for.

As far as the rule, I discern the following.

1) This rule is appended to the rule list
2) Involves the PREROUTING chain
3) With a destination address of 192.168.49.94
4) That is not going into the USB0 interface
5) That traffic is sent to the MARK target​

What does "--set-xmark 0x8000/0x8000" do ?

What is the purpose of this rule ?

 

[Martineau]

I still haven't figured out what the "BWDPI_FILTER" is for

BWDPI_FILTER Adaptive Qos->Qos ('DPI Engine' when Qos Type=Adaptive Qos)

What does "--set-xmark 0x8000/0x8000" do ?

Firewall->General NAT loopback (click on the phrase 'NAT Loopback' and all will be explained!)