RayQuang's questions

I'm trying to setup multiple virtual interfaces with VLAN's on a single NIC. I'm running Debian Squeeze.

Currently this is my /etc/netowrk/interfaces

auto eth0.10
iface eth0.10 inet dhcp

This gives me a working connection, however I'm not sure how to configure several like these on a single NIC so I can use multiple external IP's.

I have tried aliasing the VLAN's like so: iface eth0.10:1 But that was not successful and it said failed to bring up interface.

And suggestions would be greatly appreciated :)

Our organization is planning to peer with the local internet exchange, we are planning to obtain an AS number to allow us to do this. However I was unsure if we also need our own IP address space to get connectivity. Would anyone be able to clarify this?

I'm planning on reinstalling our company server as virtual machines on a physical machine. I want to do this to better manage the different services such as web and mail on separate (virtual) machines. I had a look at OpenStack compute and Eucalyptus and hey looked quite interesting.

The problem that I have is how to make these different services access the same file system where the user's files will be stores (e.g. the user will have her home directory in /home/ and will contain subfolders, e.g. mail for email and www for her webroot) I need to make sure that the user can access these files on the storage server and that they will be accessible from the respective servers (e.g. apache should access the www and Postfix / Dovecot the mailbox).

Does anyone have experience setting this up and can outline the setup?

I am starting a web app company that will be hosting a social application on our own servers. We will be getting a fiber connection with a static IP address but I was wondering if there is anything specific I should look out for when hosting a site with a lot of visitors? (i.e. network architecture and routing)

Additionally, I came across something about the Border Gateway Protocol and how it can be used to have more control over the routes that your traffic takes. I would like to know if this applies to my situation and how should I go about setting it up.

I have just been running aptitude update on my debian server via webmin when the install failed, Now my Apache2 server isn't running properly as it isn't recognizing the "namevirtualhost" directive, all the domains hosted on the server are being redirected to the default server. Luckily the other services like Postfix and Dovecot are fine.

What should I do to fix this problem?

Thanks, RayQuang

Update 1: The only errors that I receive when restarting apache are:

rayquang:~# /etc/init.d/apache2 force-reload
Reloading web server config: apache2[Thu Feb 10 20:43:22 2011] [warn] VirtualHost 192.168.1.100:0 overlaps with VirtualHost 192.168.1.100:80, the first has precedence, perhaps you need a NameVirtualHost directive
[Thu Feb 10 20:43:22 2011] [warn] VirtualHost 192.168.1.100:80 overlaps with VirtualHost 192.168.1.100:0, the first has precedence, perhaps you need a NameVirtualHost directive
[Thu Feb 10 20:43:22 2011] [warn] VirtualHost 192.168.1.100:80 overlaps with VirtualHost 192.168.1.100:80, the first has precedence, perhaps you need a NameVirtualHost directive
[Thu Feb 10 20:43:22 2011] [warn] VirtualHost 192.168.1.100:80 overlaps with VirtualHost 192.168.1.100:80, the first has precedence, perhaps you need a NameVirtualHost directive
[Thu Feb 10 20:43:22 2011] [warn] VirtualHost 192.168.1.100:80 overlaps with VirtualHost 192.168.1.100:80, the first has precedence, perhaps you need a NameVirtualHost directive
[Thu Feb 10 20:43:22 2011] [warn] VirtualHost 192.168.1.100:80 overlaps with VirtualHost 192.168.1.100:80, the first has precedence, perhaps you need a NameVirtualHost directive
[Thu Feb 10 20:43:22 2011] [warn] VirtualHost 192.168.1.100:80 overlaps with VirtualHost 192.168.1.100:80, the first has precedence, perhaps you need a NameVirtualHost directive
[Thu Feb 10 20:43:22 2011] [warn] VirtualHost 192.168.1.100:80 overlaps with VirtualHost 192.168.1.100:80, the first has precedence, perhaps you need a NameVirtualHost directive
[Thu Feb 10 20:43:22 2011] [warn] VirtualHost 192.168.1.100:80 overlaps with VirtualHost 192.168.1.100:80, the first has precedence, perhaps you need a NameVirtualHost directive
[Thu Feb 10 20:43:22 2011] [warn] VirtualHost 192.168.1.100:0 overlaps with VirtualHost 192.168.1.100:443, the first has precedence, perhaps you need a NameVirtualHost directive
[Thu Feb 10 20:43:22 2011] [warn] VirtualHost 192.168.1.100:80 overlaps with VirtualHost 192.168.1.100:0, the first has precedence, perhaps you need a NameVirtualHost directive
[Thu Feb 10 20:43:22 2011] [warn] VirtualHost 192.168.1.100:80 overlaps with VirtualHost 192.168.1.100:80, the first has precedence, perhaps you need a NameVirtualHost directive
[Thu Feb 10 20:43:22 2011] [warn] VirtualHost 192.168.1.100:80 overlaps with VirtualHost 192.168.1.100:80, the first has precedence, perhaps you need a NameVirtualHost directive
[Thu Feb 10 20:43:22 2011] [warn] VirtualHost 192.168.1.100:80 overlaps with VirtualHost 192.168.1.100:80, the first has precedence, perhaps you need a NameVirtualHost directive

hI, I am trying to install the terminal multiplexer tmux on my Debian Lenny server so that I can have multiple terminals through ssh.

However I have had a lot of difficulty installing it from the debian package, and by compiling it. When I try the package it says something about the wrong version of libc6, and when I compile it I get the following error:

server.o: In function `server_start':
server.c:(.text+0x273): undefined reference to `event_reinit'
collect2: ld returned 1 exit status
make: *** [tmux] Error 1

Help would be very much appreciated, RayQuang

I would like to know if introducing a new gateway in my network will slow things down. The question may sound unclear but here is an illustration:

Before Installing gateway server

Main Router <=> switches <=>  servers

after installing gateway Server

Main Router <=> IPtables router <=> switches <=>  servers

My question is. How much will this delay incoming outgoing requests / file transfers. thanks, RayQuang

We have fiber optic internet coming to our office soon, and i would like to know if it would be worth installing fiber NIC's in our servers and machines instead of using cat6 gigabit.

Here is the layout:

(fiber) cable from distribution point in basement -> fiber optic modem -> Network gateway (debian lenny) -> network computers and servers

I was wondering if it would be worth installing a fiber connection from the modem to the gateway and the network clients. Will the costs be worth it in terms of speed, latency and stability?

Thanks, RayQuang

I recently copied a file as the root user to my users's home directory. Ever since that my user has not been able to go to its home directory because "permission is denied". I have already chowned the directory so that it is owned by the user but still i'm getting the error.

(OS: Debian Lenny)

Can canyone help?

RayQuang

I am planning to set up a Tech startup company that will provide web application solutions. Eventually we hope to diversify into different areas such as possibly social media or other services. For now we plan on running a high demand (from 1000 to 10,000 users in the first year) website running the application. This includes a MySQL database backend, email, and development servers.

My question is then, what type of server arrangement will work best, that is ti say should i have a small cluster of ultra high power machines (E.G. Top of the range Xeons, with 12GB RAM) or will it be better to have more less powerful servers load balanced?

Should I go for 1 - 2 u servers rack mounted ot would it be beter for it just to be tower servers for maintainability?

Finally I would also like to know what kind of Internet and router i would need, I currently have 10mbit down and barely 1 mbit up, but soon our area will have a fiber optic connection with international speeds of up to 25 mbit / sec.

Thanks in advance, RayQuang

UPDATE: sorry I forgot to mention it, the platform that I will be using is PHP with the APC code cache, Probably running Debian.

I have just set up my new gigabit network and when I was about to increase the MTU to use jumbo frames, I get this error:

root@rayquang-desktop:~# ifconfig eth1 mtu 9000 SIOCSIFMTU: Invalid argument

Could anyone help me to increase the MTU.

Details: NIC: NETGEAR GA311; Switch: NETGEAR GS105, running Ubuntu 10.10 and Debian Lenny on desktop, server respectively.

Help would be greatly appreciated, RayQuang

I would like to setup my Debian Lenny server as a router for my home network using iptables, but so far have been unsuccessful. Below is a diagram of the desired network architecture

 INTERNET - (eth0) Debian server + router (eth1) -- Netgear 5 port gigabit switch  -- Clients

I have a DHCP server and a DNS server running for the internal network but I am having difficulty setting up iptables. I need port 80 and 22 open from outside (I can add the open others later) and full access to the server from inside.

Any help would be very greatly appreciated, Thanks, RayQuang

I am running the main server for my company and would like to setup a VPN so that the remote offices (in different countries) could be in the same network.

I would like to achieve the following network structure:

   --------------                                   --------------
  | Remote Net 1 |  ------------------------------ | Remote Net 2 |
  | 192.168.2.X  |               |                 |  192.168.3.X |
   --------------                |                  --------------
                                 |
                          -----------------
                          |  The Internet |
                          -----------------
                                 |
                                 |
                          -----------------
                          | Local Network |
                          |  192.168.1.X  |
                          -----------------

I would like it to be that all the computers are visible and can communicate and use the network services in the other LAN's (i.e. localnet can use file server in remote net 1 and a computer on remotenet 1 can use the file server from localnet)

Details: All clients using ubuntu 10.10 and main server running Debian Lenny Preferably VPN server will be OpenVPN

Could someone please advise me how I should go about implementing this system?

Help would be greatly appreciated, Thanks, RayQuang

Does anyone know why I get this error:

postfix/error[4711]: 707A9189C6B0: to=<[email protected]>, orig_to=<[email protected]>, relay=none, delay=0.01, delays=0.01/0/0/0.01, dsn=5.0.0, status=bounced (User unknown in virtual alias table)

I am unable to get any mails from any address, Running Debian Lenny with Virtualmin.

Thanks RayQuang