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Closed 11 years ago.
I'm working on p2p application, all these NAT-PMP and UPNP NAT traversal scenarios are so unpleasant to deal with. Any thoughts on when IPv6 will become commonly used?
It will be a LONG time before you can drop IPv4 support, if that's what you're getting at. Also, don't be so sure there won't be NAT in IPv6 too. A lot of people want to use IPv6 the same way they use IPv4, and that means isolated internal networks with NAT to the public side. At first it was looking like there weren't going to be any implementations of IPv6 NAT, but now I believe there are, so you can't even count on the disappearance of NAT (still, it should be 1-to-1 NAT, which is a little easier to deal with than n-to-1 port overloading). Even without NAT people still want stateful firewalls, so you still have to poke holes in those for P2P.
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Closed 9 years ago.
I have a production web service built with Node JS(HTTP Server) on a Linux box with a HAProxy Load Balancer and wanted some kind of graphical tool to do live reporting on the server. I specially wanted to look at requests/min, request failures, etc. Anything out there people would suggest. I need something non-intrusive b/c I will be handling 20mil+ requests a day.
Have you looked at cube (https://github.com/square/cube), graphite/carbon (http://graphite.wikidot.com/) or opentsdb for such data monitoring/display?
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Closed 10 years ago.
I have read in numerous places that in theory an ssl/443 websocket connection has a high percentage success rate when the client is behind corporate proxy/firewalls. This topic also touches on the issue: Websockets behind enterprises proxies.
Our setup is node.js with websocket-node server side, passing binary data to Chrome 15+ client. No issues with performance as it is blazing fast. I do however have failed connections within corporations, in one example I know they are using an explicit proxy, connecting to that proxy server on port 8080.
The first question is two part: a) what mechanisms can I use to debug the issue to know what is blocking the upgrade, and b) for those with experience what is most likely the culprit?
Secondly, what performance hit will I take if I fall back to flash (i.e. websocket-js)?
Many thanks in advance.
UPDATE: It is now clear that the upgrade handshake request is never being seen by the websocket server, so it is being blocked on the client side before the request ever gets out.
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Closed 11 years ago.
If I was to Write a virus for the challenge What would I need to do to contain it ?
Obviously I would disconnect the computer from the internet first but what else could I do to prevent the worst case scenario of it making it on to the internet.
Im not saying im smart enough to bring down society but I don't want to go to jail for a weekend project.
Is is likely that my antivirus will kill my virus program as soon as it is compiled ?
What would I need to do to contain it ?
You need to use a sandboxed environment. Perhaps a virtual machine such as vmware or virtualbox that doesn't have physical access to the network.
Is is likely that my antivirus will kill my virus program as soon as
it is compiled
Not really. Antivirus programs are based on signature scanning + heuristics. Your program should be "0-day". So until it does something fishy, it's unlikely any antivirus will ask questions.
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Closed 10 years ago.
I am setting up phplist for a client on my dedicated server. I am going to install a dedicated mail solution on a dedicated IP address for his mailing list. He has an estimated 5,000 subscribers interested in his newsletter right now. The goal is to send out about that many emails per night.
The current obvious choices are qmail and postfix. Can I get some pros and cons to both? Are there any better solutions?
qmail can handle that. DNS will be your main problem for sending into sites like yahoo, godaddy, and gmail for example. Make sure you are hosted on clean IPs:
http://www.mxtoolbox.com/blacklists.aspx
http://www.spamhaus.org/sbl/
If you use qmail this is a good site: http://www.qmailrocks.org/
A newsletter going out every night sounds like spam. Be careful what ISP you host it at, they may suspend your account when they get complaints (there are always complaints about bulk email, even when it is solicited).
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Closed 10 years ago.
I have a service that listens on a socket and handle requests arriving to it and a client loading this service. I want to setup more nodes of the service and use a load balancer to balance the workload.
What is , in your opinion and experience, the best open source software load balancer for Linux?
Thanks,
Ronen,
Have you looked at Pound?
http://www.apsis.ch/pound/
At www.loadbalancer.org we use Pound for SSL termination , LVS (IPVS) for Layer 4 load balancing and HAproxy for Layer 7 load balancing. But these solutions balance TCP and UDP traffic, are you after a local socket based solution?
how about squid which is a open source proxy server which can do the load balancing
There is malabarista by Bruno de Carvalho