Re: Barracuda Networks Spam Firewall
Did you not receive some basic support from them during your evaluation? A perceived 90% drop in performance is pretty significant and I'd imagine that they'd be interested in helping to determine the cause. Sadly, they have not responded to my email on the topic, sent four days ago. However, someone unrelated to the company emailed me off-list saying that basically this is a known flaw in the product with back-end systems like qmail that asynchronously bounce mail for invalid recipients. See below quote: We had this problem when our inbound-smtp server ( the server the barracuda is dumping mail to) was accepting all RCPT TOs: As a result dictionary attacks were getting through and creating 'unique recipients' on the Barracuda. As soon as I fixed my mail server to reject with a 220 error on bogus RCPT TOs the problem cleared up. This is a pretty serious flaw IMHO, if it is (in fact) true. qmail isn't the only mailer that behaves this way. It looks like they may have tried to kludge their way around this with LDAP in the case of MS Exchange, which also does asynchronous bouncing of undeliverable mail IIRC. -- Jared
Re: Barracuda Networks Spam Firewall
We have done an eval of this same product (model 400). It is very cool in virtually every regard except one: performance. We were facing 1+ hour mail delays (!) through the device when pumping less than 1,000,000 messages per day through it. Given that they claim it can handle ten times that much, I am left wondering what happened. Very disappointing in that regard; the eval unit is being shipped back as a result. -- Jared At 11:35 AM 5/17/2004, Claydon, Tom wrote: Doing evaluations on anti-spam, anti-virus solutions, and ran across this: http://www.barracudanetworks.com/ Looks like a good box -- even won an Editor's Choice award from Network Computing recently. Does anyone on list have any experience with these boxes? If so, how are they with false positives, quarantine capabilities, etc? Thanks, Tom Claydon Dobson Telephone ## Jared B. Reimer <[EMAIL PROTECTED]> ## CTO / The River Internet Access Co. ## +1 (877) 88-RIVER x170 || http://www.theriver.com/
Increase in traffic to/from DSL subs since August?
Greetings. Another independent ISP operator and I have noticed a pretty significant increase in traffic to and from our broadband (DSL) subscribers since August. It's been a fairly steady uptick, at least in my case, resulting in a doubling of overall average traffic to/from these folks since then. Have others seen a similar trend? Any thoughts as to what the cause may be? Our best guess a virus/worm, possibly being used as a spam relay or other proxy at this point... Many thanks, -- Jared
