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Re: Security benefits of spliting services between two ISP providers
From: Reece Mills <reece.mills () charter net>
Date: Tue, 17 May 2005 12:38:06 -0500

Dave,
You and Frank have both made excellent points. Utilization of bandwidth and risk reduction through splitting services across providers. I guess I had taken a particularly narrow view in my initial response.

Splitting of services across different ISP's is not a bad idea. My note vaguely addressed that. If a cost to benefit evaluation supports an entity utilizing two separate ISP's. My question would be, Is this extra expenditure necessary for the organization? An SLA with one ISP might be enough to accomplish a logical space split for a fraction of the costs of buying two SLA's from two providers. Now, if you are in an area that is prone to natural and man made disasters (fires, flooding, earthquakes and bombings) and since you are a global entity, then by all means split services as described. However, if that is the case then full redundancy would be my goal.

My apologies for the terse initial response. Sleep is a good thing and I will try to get more of it.

Reece



Dave Hawkins wrote:

In the case of DDoS, if your web services are targeted, your email
systems would still have plenty of bandwidth (splitting services in that
way). Segmenting services like this would pose no real threat from a
security standpoint, and in my opinion, only allows you to more fully
utilize both lines that you're already paying for. In the case of
actual ISP failures, it is quite easy to use something like the Radware
LinkProof or WSD to handle complete fail-over to other network
providers. It can be (and is) easily done with a lot of our clients who
require high-availability for disasters, but also to prevent someone
from saturating a particular ISP link. Combine this with a
multi-segment IPS and you can minimize your risks greatly.
Don't misinterpret this as a plug for our products, but Radware has been
in the high-availability and security space for a while now, and we get
these kinds of questions all the time.

Cheers,
-Dave Hawkins
Security Engineer
Radware
http://www.radware.com


-----Original Message-----
From: full-disclosure-bounces () lists grok org uk
[mailto:full-disclosure-bounces () lists grok org uk] On Behalf Of Frank
Laszlo
Sent: Tuesday, May 17, 2005 8:04 AM
To: Reece Mills
Cc: full-disclosure () lists grok org uk
Subject: Re: [Full-disclosure] Security benefits of spliting services
between two ISP providers

Not exactly. If one ISP fails, the other could be used as a backup
system for the services that are on the "failed" isp. This could be done
with a transparent proxy or something of the sort.

Regards,
 Frank


Reece Mills wrote:


Only part of what you need will be affected if one of your ISPs
fail....  Hope it is not the web based business services provider...
Hope it
is not the email provider.... Ok... What will be the security benefit of splitting services between
two ISP providers as you described?

Nothing.

Reece


Rossen S. Naydenov wrote:

|Hi group,
|
|What will be the security benefit of splitting services between two
|ISP providers?
|By splitting services I mean have one ISP serve only web based
|business services and other ISP serve the email and traffic generated


|by internal web browsing (or something similar).
|Right now everything goes through one ISP and second ISP connection
|is kept as a backup.
|
|Thanks.
|
|
|
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_______________________________________________
Full-Disclosure - We believe in it.
Charter: http://lists.grok.org.uk/full-disclosure-charter.html
Hosted and sponsored by Secunia - http://secunia.com/


_______________________________________________
Full-Disclosure - We believe in it.
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Hosted and sponsored by Secunia - http://secunia.com/


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