If you have aliased IP Address, all connection made from your server will be seen as you main IP Address by the outside world, unless of course, stated otherwise.

In this case, one of my server have around 5 usable IP Address, and only two are effectively in use, one for the the web server and the other is for inbound Mail Server IP Address.  I am using postfix MTA which by default listen to all IP Address(es) in your server including the loopback (localhost).

If you want to use a dedicated IP Address to send emails to the outside world, in postfix, you can either;

• Set the inet_interfaces into one spesific IP Address, e.g. inet_interfaces = 117.103.xx.xx, the IP Address can’t be loopback address.
• Or, use the smtp_bind_address parameter

SMTP Bind Address

I need postfix to listen on loopback address, so option one is no go, so I try using option smtp_bind_address, which according to the manual can be configured either through main.cf, or master.cf.

I try master.cf first so I can use different IP Address from the one use by inbound mail, but was not successful, so I try to put the parameter in the main.cf.

smtp_bind_address = 117.103.xx.xx

Where 117.103.xx.xx is the same IP Address used by mx host name stated in the DNS config. I am still experimenting with the master.cf, and intend to update this post when successful.

References:

• http://www.postfix.org/postconf.5.html#smtp_bind_address

Update

This repo is no longer available, use http://mirror.biz.net.id/ it is the best one available right now (IMO).

I’ve searched the forum and the internet for tutorial on how to capture Router OS’s simple queue OID using cacti, and haven’t find any luck..

So I decided to share my really simple way, by capturing each OID manually for every entry in Simple Queue I want to graph..

Please notice that I am not an expert in whether Cacti or Mikrotik Router OS, so It will be great if you guys willing to show me/us a better way to do this..

Why cacti? why not built-in graphing tools provided by Router OS?…, for now I only have one reason –> With cacti we could gather data from specific range of time..

The Article published earlier in;

• Cacti’s Forum (English)
• Mikrotik’s Forum (English)
• Other Blog (Indonesian)
• Forum RTRW (Indonesian)

This How-to assumed that you already have knowledge on installing and using cacti. Also notice that Router OS Simple Queue OID will be dynamically changed if we delete (-) entry on our queue. To find out the OID of the simple queue we want to graph (from the router OS).

[tjdykb@xxx] > /queue simple pr oid

Flags: X - disabled, I - invalid, D - dynamic
0    name=.1.3.6.1.4.1.14988.1.1.2.1.1.2.54
bytes-in=.1.3.6.1.4.1.14988.1.1.2.1.1.8.54
bytes-out=.1.3.6.1.4.1.14988.1.1.2.1.1.9.54
packets-in=.1.3.6.1.4.1.14988.1.1.2.1.1.10.54
packets-out=.1.3.6.1.4.1.14988.1.1.2.1.1.11.54

1    name=.1.3.6.1.4.1.14988.1.1.2.1.1.2.32
bytes-in=.1.3.6.1.4.1.14988.1.1.2.1.1.8.32
bytes-out=.1.3.6.1.4.1.14988.1.1.2.1.1.9.32
packets-in=.1.3.6.1.4.1.14988.1.1.2.1.1.10.32
packets-out=.1.3.6.1.4.1.14988.1.1.2.1.1.11.32

2    name=.1.3.6.1.4.1.14988.1.1.2.1.1.2.1
bytes-in=.1.3.6.1.4.1.14988.1.1.2.1.1.8.1
bytes-out=.1.3.6.1.4.1.14988.1.1.2.1.1.9.1
packets-in=.1.3.6.1.4.1.14988.1.1.2.1.1.10.1
packets-out=.1.3.6.1.4.1.14988.1.1.2.1.1.11.1

etc.. 

Watch the ID of the simple queue we want to graph .. the entry we use is bytes-in (download) OID and bytes-out (upload) OID..

What I did (in cacti) was made a data template (duplicated from SNMP – Generic OID Template) one for download and one for upload each, so we will have two data templates, which we will use to capture 2 different OID from one simple queue entry.. The template file link available at the end of this message … I also made a graph Template .. modified from SNMP Interface Template.. (link also available)..

Then I made data-sources for Download Traffic and Upload Traffic using the previously imported/made data-templates (say MT-SQ-down and MT-SQ-up) .. for Download Traffic put the OID bytes-in you get from the Router OS and bytes-out for Upload Traffic..

Finally we made the simple queue graph for Router OS Device, using the graph template imported/made before.. choose Download and Upload Traffic for data-sources. Wait for 10 whole minutes ..

I know it rather stupid, but at least there is a way.
Good Luck

Links,

Data-templates (right click- save as)

• cacti_data_template_mtsqdown_tjdykb.xml
• cacti_data_template_mtsqup_tjdykb.xml

Graph-templates (right click- save as)

• cacti_graph_template_mikrotik_simple_queue_tjdykb.xml