Web Gateway - basics

Can I ask in real management jargon friendly speak – is it common for more complex networks (many sites) to have more than one internet service. By internet service I mean your employees ability to access www.google.com from a corporate asset (what is the technical term)? My concern is, it seems a common assumption that all staffs internet activity goes through the same internet gateway, so it’s a case of just deploying one monitoring tool there and that will cover all staff. But I am not sure if that’s a bit of an age old assumption, and maybe modern networks have multiple web gateways?

Are there any specific cases whereby networks would need more than 1 internet “gateway”? Can you provide some examples where this would be the case? Or is it common for most medium size networks to have just the one internet gateway? And thus there’s just one to manage. Is there anyway users can be made exempt from the restrictions of the internet filter, ie.websense? And go through another gateway, or bypass the restriction policies?
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When you say gateway, do you mean ISPs or just the exit point from your internal network to external network.
Common practice is to have a firewall between the external and the internal network. Thus making the Firewall a gateway for the internet.
Now, there may be scenario where there are multiple service providers giving an increased bandwidth and redundancy for internet. It is different from what a gateway is. Most medium and large Business organizations use one gateway. But in some situations there may be a case of having multiple gateways for internet.
Now, about being exempt from websense, it depends on what sort of filtering policies is applied and where is Websense software actually sitting on the network. But I am sure there will be ways to tunnel through the filter.

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pma111Author Commented:
>When you say gateway, do you mean ISPs or just the exit point from your internal network to external network.

Just the exit point

>... and where is Websense software actually sitting on the network

Could you expand here? In terms of "if its sitting here, these users can bypass, if its sitting here, no-one can bypass" etc
pma111Author Commented:
Can you explain what a "gateway" is in management speak? Is it just an open port on the firewall?
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No. Gateway is a point from where a packet will go out of one network into another. It can be anything. For understanding purpose, a Physical port on your firewall may be configured as a gateway. When you see the network configuration of your NIC, you see an IP Address, subnet and a Default Gateway. So it is an address where the packet will be sent to if the NIC does not know what to do with the packet.
Now websense ideally sits on the Proxy servers or the internet providing servers. So you will have to go through them all the time to access the internet. If websense sits on some other server and you have some route available to avoid the websense server than you can bypass it. Otherwise, you can use tunneling to access restricted sites. I won't be able to exactly tell you how to do that but it is possible but very tricky and you will have to come up with new ways very frequently.
pma111Author Commented:
By tunnel are you on about the proxy avoidance sites? Or something else
By tunneling, I mean using proxy sites that can cover up your actual sites and let them go through encapsulated. But websense blocks porxy sites too.....as soon as it knows of any proxy sites, it blocks it. So you may have to change proxy servers continuously.
Your question really depending on your needs as a company. I work for a company where the internet in vital for operations and the company runs 24x7, so we have two internet connections to two different Internet Service Provides in two different locations using two different firewalls and Internet Filtering devices (web gateways). This way we can pretty much ensure that internet is always up. If the internet isn't that important and the geographical locations to your sites aren't too far apart then I would say one internet connection should be fine. It really just depends on what you need.
As mentioned previously, it varies from company to company depending on the needs. Some separate VOIP traffic from data traffic by having more than one internet provider and separate gateways.
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