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• how to split a pcap file into a set of smaller ones

  - by facha

  I have a huge pcap file (generated by tcpdump). When I try to open it in wireshark, the program just gets unresponsive. Is there a way to split a file in set of smaller ones to open them one by one? The traffic captured in a file is generated by two programs on two servers, so I can't split the file using tcpdump 'host' or 'port' filters. I've also tried linux 'split' command :-) but with no luck. Wireshark wouldn't recognize the format.

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• Not Able To Connect to Shared Resource

  - by bobber205

  We are using an older version of BartPE and are not able to connect to shared folders on our subnet. It says the network name could not be found. Connecting to the shared folder on the machine that is hosting it works fine. Any ideas on what might cause this? Thanks! Edit1: Got wireshark running and monitored traffic from the offending machine and tried to map. ZERO packets from the other machine were seen. :(

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• MRTG + RRDTool Hourly Graph

  - by SuperMicro321

  I am using MRTG + RRDtool to monitor the bandwidth on each switchport of a Cisco Catalyst 2950 via snmp. Is MRTG capable of generating an hourly graph? With RRDtool I was able to set the interval to 1 minute in hopes of getting a more detailed graph, but the shortest timeframe the graph is 'Daily' graph (5 Minute Average) and the image is too small. What I am looking to get out of this: I am looking to be able to visually monitor all of the switch ports and tell when port begins to have unusually high traffic, in real time (1 minute interval of snmp poll, graphs generated, and page refreshed).

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• Why should I use Firewall Zones and not just Address Objects?

  - by SRobertJames

  I appreciate Firewall Address Objects and Address Groups - they simplify management by letting me give a name to a group of addresses. But I don't understand what Firewall Zones (LAN, WAN, DMZ, etc.) do for me over Address Groups. I know all firewalls have them, so there must be a good reason. But what do I gain by stating a rule applies to all traffic from LAN Zone to WAN Zone which comes from LAN Address Group to WAN Address Group? Why not just mention the Address Groups?

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• Windows clients not using NTP server provided via DHCP

  - by gencha

  I have a network consisting mostly of Windows Vista and 7 clients and an Ubuntu server. The server provides both the DHCP and NTP services through dhcp3-server and openntpd. In my dhcpd.conf, the subnet is declared as follows: subnet 10.10.10.0 netmask 255.255.255.0 { range 10.10.10.10 10.10.10.200; option broadcast-address 10.10.10.255; option routers 10.10.10.1; option ntp-servers 10.10.10.1; } The clients don't seem to be using the NTP server though. When I capture the network traffic with Wireshark during the DHCP process, I also see no mention of the NTP option in the DHCP offer message. I am not quite sure if the clients would have to specifically request that option to receive it or if I have to make another configuration to offer the option.

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• Thomson TG585v7 router - promiscuous mode

  - by Nikita

  I have a TG585v7 as a router with several machines plugged into it. In the default setup, the packets are only delivered to the specific machine but I want to be able to setup to monitor all network traffic on one of the machines, i.e. I need those packets to be picked up when my ethernet card is in promiscuous mode. Is this possible? Guide here has this "mcastpromisc Make the IP interface multicast promiscuous. OPTIONAL", is this what I am looking for? Does it mean I need to manually add all my machines by their MAC addresses to be able to receive packets destined for them? Or am I out of luck and I need to get a better router?

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• Cisco ASA 5505 and slow download speeds for Apple devices

  - by James

  For traffic routing through my ASA 5505, downloads for all Apple devices, including AppleTV iPad gen 1 IMac MacBook Pro are very slow. speedof.me show less than 1 Mbps download (where I should have 20 Mbps +), yet for any Windows-based device, the download speeds are in excess of 20 Mbps. The Windows device, including the iMac and MacBook Pro machines, are connected via ethernet cable. Why are Apple devices experiencing such pain? Is it an ASA setting, or something else? Thanks.

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• Making a Ligthing Flash Magento store with Nginx on AWS Elastic Beanstalk with Minimum Resource Utilization

  - by Junaid

  I'm going to install Magento on AWS Elastic Beanstalk t1.micro (free tier), on Windows or Linux + Nginx + Php-fpm + eAccelerator, CDN (cloudfront), MemcacheD. I will ask my developer to make my website as fast as it can be with as much as possible, minimum AWS utilization. My webstore will have <1000 SKUs and I'm not expecting the traffic without going into thorough SEO/PPC. Now I have three questions: Do I really need Nginx microcaching along with eaccelerator? Do I need AWS Elastic Load Balancer with t1.micro tier for the sake of scalability (as I have heard that magento is resource hungry application, may fully utilize t1.micro AMI) or can I replace AWS ELB with Nginx load balancer? In AWS Elastic Beanstalk?

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• Apache vs Lighttpd: Weird behavior in reverse proxy mode.

  - by northox

  Context: I have an Apache server running in reverse proxy mode in front of a Tomcat java server. It handle HTTP and HTTPS and send those request back and forth to the Tomcat server on an internal HTTP port. Goal: I'm trying to replace the reverse proxy with Lighttpd. Problem: while asking for the same HTTPS url, while using Apache as the reverse proxy, the Tomcat server redirect (302) to an HTTPS page but with Lighttpd it redirect to the same page in HTTP (not HTTPS). Question: What does Lighttpd could do different in order to have a different result from the backend server? In theory, using Apache or Lighttpd server as a reverse proxy should not change anything... but it does. Any idea? I'll try to find something by sniffing the traffic on the backend tomcat server.

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• SNMP counter issues with cisco RV082

  - by Chance

  Does anyone else poll this router with SNMP? We are using firmware version: 2.0.0.19-tz We are having problems with the traffic counters, some of them appear to be implemented as 16 bit counter instead of 32 bit counters. The reason this is causing problems is that they roll over (at 65,000) to 0 in less than our minute polling cycle, really skewing our metrics. The counter for the Lan (interface 2) seems to be functioning properly, however interfaces 3 and 4 (WAN and DMZ / WAN2) rollover at 65000. Tue May 11 08:38:31 EDT 2010 IF-MIB::ifInOctets.1 = Counter32: 137634 IF-MIB::ifInOctets.2 = Counter32: 1865677943 IF-MIB::ifInOctets.3 = Counter32: 12450 IF-MIB::ifInOctets.4 = Counter32: 49354 Look at counter IF-MIB::ifInOctets.4 5 seconds later: Tue May 11 08:38:36 EDT 2010 IF-MIB::ifInOctets.1 = Counter32: 137634 IF-MIB::ifInOctets.2 = Counter32: 1865836207 IF-MIB::ifInOctets.3 = Counter32: 13167 IF-MIB::ifInOctets.4 = Counter32: 12900 Any suggestions? Seems like a bug to me, however I just wanted to make sure I wasn't crazy.. Thanks!

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• Need Recommendations: Network Software and Hardware Setup for small firm

  - by Rogue

  Will be starting a small graphics design firm soon, with 20 employees. Therefore need software to manage the network. Have bought a bulk license of Windows 7. I have a spare computer which can act as a server if necessary, but its an ancient Dell machine (Pentium-III). If required I would purchase an extra machine, but would like to avoid unnecessary costs at start up. Following are the main functions that I would like to perform: Need to monitor\control network traffic and internet usage, restrict access to certain websites Alerts when access to certain software's, and when trying to tamper with privileges Ability to view desktops of any computer at any given time Limit access to certain hardware like USB ports,etc Limit access to folders on the computer Log/Report of all actions including keystrokes performed on any computer Local Network chat and talk client Collaboration and Work logs Any Software available to do all of the above and also any additional hardware required besides network switches, network card's and CAT5e cables. Any other recommendations besides the above mentioned hardware setup

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• XDMCP works for Solaris, not for RHEL

  - by joshxdr

  I have some old RHEL4 servers that until recently I was able to connect to remotely with Exceed (remote desktop using XDMCP) from my windowsXP PC. My PC is connected to our network by wired LAN. Recently it seems something has changed in our network. I can still connect to all the old Solaris and HPUX servers with Exceed, but for some reason I can no longer connect to the RHEL4 servers. I assume this is some kind of "security" feature turned on in our network. Does anyone know what this might be, and how I can tell IT to re-enable it? Update: A colleague has found that he can connect (very slowly) to these RHEL4 boxes with XDMCP if he is using our VPN from home, but when he is in the office using wired LAN he cannot connect to them. So it seems that there is some kind of firewall or ???, part of our wired LAN network, that is blocking XDMCP traffic from RHEL4.

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• Specific IP routing for VPN

  - by Roy

  Is there a way that I can prevent an entire subnet from using internal routing. The VPN server is supposed to be a way to access the company's intranet websites for some people, while for others it is supposed to do routing to the outside only and therefore not having access to any internal websites. The VPN server has a DNS on the actual server but not all should be using this DNS. Some of the users should be directly sent out of the server to the internet. Example: 10.0.0.1 is the DNS on the server, gateway for the VPN 10.0.0.2 is a user (A) on the VPN having access to the intranet websites (subnet is 10.0.0.0/25) 10.0.0.192 is a user (B) only needing routing and no access to intranet websites (subnet is 10.0.0.192/26) All traffic of user B should be directly rerouted out of the server. I have tried several iptables but without success.

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• Saving music wisely: Why save 'Queen - Bohemian Rhapsody.mp3' millions of times?

  - by hsmit

  As far as I'm concerned, Queen's song 'bohemian rhapsody' is one of the most popular songs all time. But for the purpose of this message you may replace this with another track. At the same time I think 60% of the digital-music listeners have this track. Sometimes we have multiple copies: different versions of the track, different devices, unwanted duplicates in download folders, itunes folders etc.. Wouldn't it be much smarter to store these songs only once? You can imagine various solutions for this. How would you accomplish this? Some criteria that may help you find an answer: It must reduce disk space It must remember which music belongs to you (DRM) It must use network traffic efficiently

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• W3 Total Cache or WP Super Cache?

  - by javipas

  I'm just preparing the setup of a new VPS where I will migrate a WordPress blog with a good traffic (currently, around 40k pageviews a day), and I was thinking about the caching strategy. I've found different ideas and recommendations, but from previous experiences I will setup a Nginx+PHP-FPM+MySQL (LEMP) system on a Linode VPS. I've read also about setting Nginx as a reverse proxy with Apache, and even using Varnish too, but I don't know if all of this can benefit the speed/performance of the blog (that's the only thing that will be installed on the VPS). The question now is... would you recommend W3 Total Cache or WP Super Cache? I've used W3 on some blogs, but I haven't noticed great benefits and don't need all its options, so I think I could give the veteran WP Super Cache a try. Besides, some users have complained about W3 complex configuration and lack of performance (even consumig more CPU) on some cases.

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• proxy.pac file performance optimization

  - by Tuinslak

  I reroute certain websites through a proxy with a proxy.pac file. It basically looks like this: if (shExpMatch(host, "www.youtube.com")) { return "PROXY proxy.domain.tld:8080; DIRECT" } if (shExpMatch(host, "youtube.com")) { return "PROXY proxy.domain.tld:8080; DIRECT" } At the moment about 125 sites are rerouted using this method. However, I plan on adding quite a few more domains to it, and I'm guessing it will eventually be a list of 500-1000 domains. It's important to not reroute all traffic through the proxy. What's the best way to keep this file optimized, performance-wise ? Thanks

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• Bridging VirtualBox over OpenVPN TAP adapter on Windows

  - by Sean Edwards

  I'm trying to configure a virtual machine (VirtualBox guest running Backtrack 4) with a bridged adapter over a VPN connection. The VPN is is hosted by the cybersecurity club at my university, and connects to a sandboxed LAN designed for penetration testing against various servers that the club has built. My host (Windows 7 Ultimate) connects to the VPN fine and is assigned an IP through DHCP, but for some reason the VM can't do the same thing, and I'm not sure why. It's like OpenVPN is filtering out packets from the MAC address it doesn't recognize. I want the virtual machine to bridge over the VPN connection, because our IT office has very strict policies about what you can and can't do on the network. I want to be able to run active attacks (ARP spoofing, nmap, Nessus scans) in the sandbox environment without risking the traffic accidentally going over the university network and getting my internet access revoked. Bridging over the VPN connection and running all attacks from inside the VM would solve that problem. Any idea why the host can use this interface, but the VM can't?

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• Import LDIF file to external server

  - by colemanm

  As a follow-up to my previous question, which I've resolved part of, what we're trying to do now is take an exported .ldif file of the "Users" container on our OS X Server and import it into a separate OpenLDAP server on an EC2 instance. This we'll use for LDAP user authentication of other apps without having to open our internal network to LDAP traffic. The exported .ldif file thinks the DN of the "Users" container is cn=users,dc=server,dc=domain,dc=com. Is it easiest to configure the EC2 OpenLDAP server to think that it's domain is the same so the container is imported to the proper place? Or should we edit the text of the .ldif file to change the DN to match the external naming? Hopefully that makes sense... but I'm confused as to the best way to accomplish this.

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• Website content hosted with Google. Good or bad?

  - by user305052

  I recently decided to host my styles.css and various scripts on Google Docs and link them into my website. I also have all my images hosted through Picasa so that they too will load much faster and consistently across users. My site has most of its traffic from Japan, Africa, and South America, so I assume there will be a performance boost for my users since my server is hosted in Hong Kong. I (in Canada) have measured my load times to be half of what they used to be. Basically it's a free CDN for my personal stuff. I'm not too sure about all of this yet, so here's my question: what are the caveats of this setup? EDIT: So after rummaging through the ToS of both Picasa and Docs, there doesn't seem to be anything wrong with this kind of use.

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• Hyper-V R2 Performance Counters

  - by Ascendo

  Hi all I've been playing around with the WMI performance counters for Hyper-V. Of interest to me are the Virtual NIC bytes/sec input and output counters. I notice that the results are very "spikey". Over what time period is the latest counter averaged? I'm trying to calculate total traffic volume per VM, but sometimes a very high instantaneous poll result is inflating the result as I only poll the result each minute. I would prefer to read a 'bytes total' counter instead of a 'bytes/sec' counter - is there such a thing? Thanks Acendo

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• In Ubuntu, MoBlock makes it take a while to actually start using internet

  - by Matchu

  When connecting to wireless internet in Ubuntu (tested with two different networks), I connect nearly instantly. However, to actually load a page, I need to wait a few minutes, at which point I can actually use a web browser or Pidgin. Until then, various applications try to connect until they time out. I've discovered that, if instead of waiting a few minutes, I open Terminal and run sudo /etc/init.d/blockcontrol stop, everything suddenly is able to load. I can then start MoBlock again with no ill effects. Why is this happening? What is it that would cause MoBlock to take a few minutes to start letting traffic in, but only when started on bootup? Thanks!

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• Tor Browser: how do I restart just the browser?

  - by GDR

  I'm using Tor Browser on Linux from time to time, but I close the browser because it has high memory usage, and leave Vidala running in background to help the network and relay traffic. The problem is, when I want to use Tor Browser again, I have to shut down Vidala and start it again. This takes time and has negative effect on the network. When I execute ./App/Firefox/firefox-bin, the browser starts but says it's not connected via Tor network. Any ideas how to start tor browser and make it connect to existing Vidala instance?

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• redirect on a Domino HTTP server?

  - by oidsman

  Simple question but:- We have a server running Domino Http server on port 80. We have another apache server running on 8081. We want to set a DNS entry (say 'Things') to point to a page on the 8081 server. As I see it we need to do some kind of redirect on the Domino server to say that any traffic from hostname 'Things' gets a redirect to "http://server:8081/content/". So, in summary, if I type in "http://Things" on my browser I get redirected to "http://server:8081/content/" Does anyone know how to do this on the Domino Http server? Thanks in advance for your help!

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• I'm receiving an SSL error in various browsers, but I can't find non-SSL content

  - by Scott Vercuski

  I'm receiving an error with my SSL connection. Using google chrome I see the following error: Your connection is encrypted with 128-bit encryption ... however this page includes other resources which are not secure I've scoured the source code, scripts and rendered code in the browser but cannot find where an http:// call is made. I've also used Fiddler2 to examine the traffic and everything is coming across via HTTPS. Has anyone run into this issue before and if so how did you go about finding the culprit. The website is running ASP.NET MVC3 in C#. The page in question is a simple payment page. The only external call is the google analytics tracking code. The page appears to load correctly, all images and scripts are in place.

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• Serving static files fails - nginx

  - by Sergei

  Hi, I've been looking and trying around all night, but without success. I configured nginx to serve my static files and proxy all the other traffic: server { listen 80; server_name mydomain.com; access_log /home/boudewijn/www/bbt/brouwers/logs/access.log; error_log /home/boudewijn/www/bbt/brouwers/logs/error.log; location / { proxy_pass http://127.0.0.1:8080; include /etc/nginx/proxy.conf; } location /media/ { root /home/boudewijn/www/bbt/brouwers/; } } The proxy passing is no problem, but when I go to mydomain.com/media/ or try to access any testfile over there, it's without success. I paid attention to the difference between root and alias, my media folder exists, I paid attention to the trailing slashes, but still I get a 404 when trying to access my static media files. Any help?

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