What kind of replay problems Carlos? Last time I checked ESP contained anti-replay controls that solved this issue. Are there new attacks? Would love to hear more.
One of the great things with IPSec in tunnel mode is that you can pre-classify the traffic with QoS markings before encryption, and then have these values copied to the post encapsulated header (great for softphones etc.). There's not a lot of flexibility for this with SSL VPN, at least in the appliances I've seen on the market. Our experience has been too that you need to scale up more to support SSL, IPSec clients tend to be less resource intensive, but a lot of that depends on the encryption algorithms in use. We're sticking with IPSec for now. It's tried and true and we have no reason to change. -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Carlos Perez Sent: Tuesday, October 19, 2010 8:37 PM To: PaulDotCom Security Weekly Mailing List Cc: [email protected] Subject: Re: [Pauldotcom] SSL vs IPSec VPNs SSL Strip does not work on a full SSL VPN, I have tried ;), I would say it depends on the traffic, amount of traffic and how time sensitive is that traffic. SSL over UDP gives the best performance but you have a big pain of certs and cert validation to minimize the attack surface, on the IPSEC depending on the implementation you can get the most compatibility for different client types but on high traffic with time sensitive traffic you will get fragmentation and possible replay problems. There are a lot more pros and cons but after 5 days of hospital I'm bone tired from sleeping on a chair, when I get coffee in me in the morning I will try to expand on the points. Cheers, Carlos On Oct 19, 2010, at 9:41 AM, Michael Douglas wrote: > Hey all, > > I'm trying to determine what protocols should be permitted on a new > VPN concentrator. > > I'd like to stick with IPSec, it's tried and true, and to quote Garth: > "We fear change". However, it seems that all the vendors are going > down the SSL route. Now I know SSL is 'safe', but it seems like it's > more open to attacks like SSLStrip (thanks again Moxie for making us > aware of the problems!) I get that SSL is easier for administrators > and end users alike, but is that convenience at too high a cost? > > So what are your thoughts? Am I being too paranoid? If there are > articles or places where I should RTFM, that's cool... I just need to > know what FM to read!! Please send the links/info ;-) > > > Thanks for your input, and have a nice day! > - Mick > _______________________________________________ > Pauldotcom mailing list > [email protected] > http://mail.pauldotcom.com/cgi-bin/mailman/listinfo/pauldotcom > Main Web Site: http://pauldotcom.com _______________________________________________ Pauldotcom mailing list [email protected] http://mail.pauldotcom.com/cgi-bin/mailman/listinfo/pauldotcom Main Web Site: http://pauldotcom.com ****************************************************************************** This email contains confidential and proprietary information and is not to be used or disclosed to anyone other than the named recipient of this email, and is to be used only for the intended purpose of this communication. ****************************************************************************** _______________________________________________ Pauldotcom mailing list [email protected] http://mail.pauldotcom.com/cgi-bin/mailman/listinfo/pauldotcom Main Web Site: http://pauldotcom.com
