isp - advice on adsl versus coaxial connection

Hi i am setting up my asa 5505 router via either:

Virgin media - coaxial connection to vmdg450 router then to ethernet connection to my asa firewall to LAN.

- i no virgin provide download 20mb + & upload varies due to day or night

£623 per annum
24 mths

or

XLN isp company - they provide adsl

- 10 upload & 40 mb download

£520 per annum
24 mths

I wish to to setup exchange server to send & receive emails externally & whatever else or whatever other software i choose to use prior to setting it up at companies.  So i am not interested in download or upload speed currently due to just testing practical purposes.

Note: both isp companies have confirmed all ports are available to be used so any software i require that may use a specific port will not be blocked.


Note: im not sure if adsl connections are known to have issues compared to coaxial as i have been a virgin media previous residential customer before.
question1.  Shall i use adsl or coaxial connection as im doing this from home 1st ?
mikey250Asked:
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BembiCEOCommented:
As Exchange doesn't really need a high speed connection, you need only a bandwith which is able do carry your incoming and outcomming emails...

More important to Exchange is if you get a static IP Address from a static pool and that you have the possibility to set some external DNS records for communication.
Dynamic IP addresses are usually denied by most of the other mail gateways, so you would not be able directly  to send mails, you need a smarthost (provider) to send mails.

As cable is usually connected to television and mostly connected to home users, providers usually doesn't provide a fixed IP.  If you get a fixed IP you can use for sending emails, there is no advantage or disadvantage between cable and dsl.
Cable has possibly some speed advantages against dsl, but depends on your locations and infrastructure there. Cable (as used also for television) varies sometimes more in the bandwidth, dependent where you are. But can happen with DSL too. The bandwidth you can understand as a maximum value,
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Mohammed KhawajaManager - Infrastructure:  Information TechnologyCommented:
Difference is that coaxial is a series connection (ie all houses on the street goes through same pipe to the telco) where as ADSL is a dedicated point to point (ie hub and spoke) which means your neighbors internet activity should not affect your throughput.  For Exchange you either need a fixed IP or a Smarthost to relay from.
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mikey250Author Commented:
Ok thanks for that useful info.

i do also have some old cisco 800 series routers that have an adsl connection so i am thinking of making use of those temporarily if i go with the adsl connection.

additional to my cisco 800 series i wish to also use asa 5505 firewall so not sure if this wil function if i have the adsl connection.  I am thinking i have to setup nat/pat and dhcp to link to my isp static ip for the wan part ?

Not sure if ideal ?
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Mohammed KhawajaManager - Infrastructure:  Information TechnologyCommented:
Your ADSL router will need to be plugged in to your ASA5505 firewall and it will have an Internet address.
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mikey250Author Commented:
I was advised that if i have my own adsl router which i do: cisco 800 series firewall - then i can use that to plug into the adsl port on the wall.

Previously i had virgin media coaxial connection screwed into my virgin media vmdg450 set to modem enable providing a public ip address, which then plugged into my asa5505 but was not able to get able to get the exact advice to create the nat to allow wan/lan - so i gave up!!

I have an old thread out there still that i think i have still open.
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mikey250Author Commented:
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BembiCEOCommented:
Have in mind that there are different DSL standards, which have to be supported by DSL modem, what connects to the DSL port. If your router is too old and doesn't support the actual standard, connection will fail...
Usually the provider know, what works or what not. Or at least can tell you the standard, what the modem (included in router) has to support.
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mikey250Author Commented:
Ok.  If i decide to have an adsl connection  assume  i can still use my asa5505 which have eth ports ?
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BembiCEOCommented:
For DSL, you need a DSL modem, for cable a cable modem and for fiber glass a fiber glass modem.
What is behind it doesn't care.

At least in my country it is usable, that the provider delivers the modem or at least offers one. The point is mostly the technique behind it, where different modules from different manufacturers are used and they usually change the default configuration of the modems to fit best with their used technique. This change is usually not visible for you.
Doesn't mean that other modems are not working, but not every modem works properly with every line.

The other device is the router, which just connects via the modem to the endpoint of the provider.
The modem is the physical connection, the router mostly the logical connection. In other scenarios the modem is the physical as well as logical connection and the router just connects to a WAN Ethernet port.  

At my location is was even usable in the past, that the provider even didn't gave out the logon information, they just put it into the configuration of the modem device or used TR069 protocol to transmit the data into the modem. So these kind of modems work as physical and logical connection device.

So you have 3 possibilities:

1.) If the modem is included into a router (like ASA 800M has a port, which can be used for a modem), you need the correct configuration information (phys. connection) from the provider as well as the logon information (logical connection). Then the modem of the router creates the physical connection and in the WAN configuration you supply the UserID and password to create a logical connection.
You plug in the DSL port of your device into the telephone line connector.

2.) You get a (preset) modem from your provider, which contains all information for the physical connection and you have UserID and Password for the logical connection. In this case, you connect the WAN port of your router with the Ethernet port of your modem. Inside the router you configure the WAN port and provide USerID and Password.

3.) You get a modem/router from your provider which is completely set up or get the configuration via TR069 protocol. In this case you connect the WAN port of your router to the ethernet port of the provider modem/router and inside your router you just set the network setting, if not provided from the provider modem/router via DHCP (Pass through mode).

As I could see, your ASA 5505 doesn't have a modem, but 2.) and 3.) should work if you can configure your WAN port.
The ASA 800 may work, if you have a fitting DSL module, so in this case option 1.) maybe possible as well. But before you buy a new modem module, a provider modem may be cheaper.
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mikey250Author Commented:
hi yes i do understand!!! I was just explaining my issue on a previous thread as i did not know exactly what line of configuration i was missing when trying to allow internet access via my asa 5505.

If i ran the dhcp from the asa then i did get internet through my asa but as my windows 2008 was already running dhcp this was why i removed asa dhcp.

Its ok
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mikey250Author Commented:
Good
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