Internal Web-Proxy

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Contents [hide] 1 Introduction 2 Basic Setup 3 Firewall NAT 4 Mangle Setup 5 Queue Tree Setup

[edit] 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.

[edit] Basic Setup

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

admin@instaler] > 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:

[admin@instaler] > 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.

[admin@instaler] > 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

[edit] Firewall NAT

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

[admin@instaler] 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

[edit] 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.

[admin@instaler] > 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).

[admin@instaler] > 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

[edit] 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".

[admin@instaler] > 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.