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Queue with Masquerading and Internal Web-Proxy

Queue with Masquerading and Internal Web-Proxy

01. Introduction

This page will tak about how to make QUEUE TREE in RouterOS that also running
Web-Proxy and Masquerading. Several topics in forum say it’s impossible to do.

In version 2.9.x, we can not know which traffic is HIT and which traffic is MISS
from web-proxy. Several people want to make a configuration, to let cache data in
proxy (HIT traffic) deliver in maximum possible speed. In other word, if we already
have the requested data, those process will not queued.

In ver 3.0 we can do this, using TOS header modification in web-proxy feature.
We can set any TOS value for the HIT traffic, and make it as parameter in mangle.


02. Basic Setup
First, let’s set the basic setting first. I’m using a machine with 2 network
interface:

———————————————————————————
[email protected]] > in pr
# NAME TYPE RX-RATE TX-RATE MTU
0 R public ether 0 0 1500
1 R lan wlan 0 0 1500
———————————————————————————

And this is the IP Address for each interface:

———————————————————————————
[[email protected]] > ip ad pr
Flags: X – disabled, I – invalid, D – dynamic
# ADDRESS NETWORK BROADCAST INTERFACE
0 192.168.0.217/24 192.168.0.0 192.168.0.255 public
1 172.21.1.1/24 172.21.1.0 172.21.1.255 lan
———————————————————————————

Don’t forget to set the transparant web-proxy. We set cache-hit-dscp: 4.

———————————————————————————
[[email protected]] > ip proxy pr
enabled: yes
src-address: 0.0.0.0
port: 3128
parent-proxy: 0.0.0.0
parent-proxy-port: 0
cache-drive: system
cache-administrator: “webmaster”
max-cache-size: none
cache-on-disk: yes
maximal-client-connections: 600
maximal-server-connections: 600
max-fresh-time: 3d
serialize-connections: yes
cache-hit-dscp: 4
———————————————————————————

03. Firewall NAT

Make 2 NAT rules, 1 for Masquerading, and the other for redirecting transparant proxy.

———————————————————————————
[[email protected]] ip firewall nat> pr
Flags: X – disabled, I – invalid, D – dynamic
0 chain=srcnat out-interface=public
src-address=172.21.1.0/24 action=masquerade
1 chain=dstnat in-interface=lan src-address=172.21.1.0/24
protocol=tcp dst-port=80 action=redirect to-ports=3128

04. Mangle Setup

And now is the most important part in this case.
———————————————————————————
If we want to make HIT traffic from web proxy not queued, we have to make a mangle
to handle this traffic. Put this rule on the beginning of the mangle, as it will
check first.

———————————————————————————
[[email protected]] > ip firewall mangle print
Flags: X – disabled, I – invalid, D – dynamic
0 ;;; HIT TRAFFIC FROM PROXY
chain=output out-interface=lan
dscp=4 action=mark-packet
new-packet-mark=proxy-hit passthrough=no
———————————————————————————

As we will make Queue for uplink and downlink traffic, we need 2 packet-mark. In this
example, we use “test-up” for uplink traffic, and “test-down” for downlink traffic.

For uplink traffic, it’s quite simple. We need only one rule, using SRC-ADDRESS and
IN-INTERFACE parameters, and using PREROUTING chain. Rule number #1. But for downlink,
we have to make sevaral rules. As we use masquerading, we need Connection Mark,
named as “test-conn”. Rule no #2. Then we have to make 2 more rules. First rule is
for non-HTTP connection / direct connection. We use chain forward, as the data traveling
through the router. Rule no #3.

The second rule is for data coming from web-proxy to the client (MISS traffic).
We use OUTPUT chain, as the data coming from internal process in the router itself.
Rule no #4.

For both rules (no #3 and #4) we named it “test-down”.

Please be aware, we use passthrough only for connection mark (rule no #2).

———————————————————————————
[[email protected]] > ip firewall mangle print
Flags: X – disabled, I – invalid, D – dynamic
1 ;;; UP TRAFFIC
chain=prerouting in-interface=lan
src-address=172.21.1.0/24 action=mark-packet
new-packet-mark=test-up passthrough=no

2 ;;; CONN-MARK
chain=forward src-address=172.21.1.0/24
action=mark-connection
new-connection-mark=test-conn passthrough=yes

3 ;;; DOWN-DIRECT CONNECTION
chain=forward in-interface=public
connection-mark=test-conn action=mark-packet
new-packet-mark=test-down passthrough=no

4 ;;; DOWN-VIA PROXY
chain=output out-interface=lan
dst-address=172.21.1.0/24 action=mark-packet
new-packet-mark=test-down passthrough=no
———————————————————————————

05. Queue Tree Setup

And now, the queue tree setting. We need one rule for downlink and one rule for
uplink. Be careful when choosing the parent. for downlink traffic, we use parent
“lan”, the interface name for local network. And for uplink, we are using parent
“global-in”.

———————————————————————————
[[email protected]] > queue tree pr
Flags: X – disabled, I – invalid
0 name=”downstream” parent=lan packet-mark=test-down
limit-at=32000 queue=default priority=8
max-limit=32000 burst-limit=0
burst-threshold=0 burst-time=0s

1 name=”upstream” parent=global-in
packet-mark=test-up limit-at=32000
queue=default priority=8
max-limit=32000 burst-limit=0
burst-threshold=0 burst-time=0s
———————————————————————————

You can use those mangle also with PCQ.

Edited by primadonal
www.primadonal.com
primadonal[at]yahoo.com

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