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  • Socksify TCP connections reaching a gateway IP -- preferably without iptables

    - by Alexandra Neagu
    I have Virtualbox installed on Debian with a few virtual machines. I can't install anything in the guests, and I use host only networking, vboxnet0. The host IP in the host network is 192.168.56.1, and the guests have static IPs in 192.168.56.0/24. I access Internet with a SOCKS proxy (without authentication) and I would like the Virtualbox guests TCP connections to be sent through the SOCKS proxy. This would also be useful for socksifying external TCP reaching a gateway network card or wireless access point. I looked at transocks, tun2socks, with dante-client, etc., but I don't know how can I achieve this without enabling IP forwarding in the host and using iptables. Maybe to attach somehow the Virtualbox vboxnet0 network to the tunnel tun0 used by tun2socks? Or maybe there is a way to do NAT to tun0 in Virtualbox? I only need TCP traffic and I don't need UDP, not even for DNS.

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  • Linux networking crash: best steps to find out the cause?

    - by Aron Rotteveel
    One of our Linux (CentOS) servers was unreachable last night. The server was not reachable in any way except for the remote console. After logging in with the remote console, it turned out I could not ping any outside hosts either. A simple service network restart solved the issue, but I am still wondering what could have caused this. My log files seem to indicate no error at all (except for the various daemons that need a network connection and failed after the network failure). Are there any additional steps I can take to find out the cause of this problem? EDIT: this just happened again. The server was completely unresponsive until I issued a networking service restart. Any advise is welcome. Could this be caused by a faulty hardware component? As per Madhatters request, here are some excerpts from the log at the time (the network crashed at 20:13): /var/log/messages: Dec 2 20:01:05 graviton kernel: Firewall: *TCP_IN Blocked* IN=eth0 OUT= MAC=<stripped> SRC=<stripped> DST=<stripped> LEN=40 TOS=0x00 PREC=0x00 TTL=101 ID=256 PROTO=TCP SPT=6000 DPT=3306 WINDOW=16384 RES=0x00 SYN URGP=0 Dec 2 20:01:05 graviton kernel: Firewall: *TCP_IN Blocked* IN=eth0 OUT= MAC=<stripped> SRC=<stripped> DST=<stripped> LEN=40 TOS=0x00 PREC=0x00 TTL=100 ID=256 PROTO=TCP SPT=6000 DPT=3306 WINDOW=16384 RES=0x00 SYN URGP=0 Dec 2 20:01:05 graviton kernel: Firewall: *TCP_IN Blocked* IN=eth0 OUT= MAC=<stripped> SRC=<stripped> DST=<stripped> LEN=40 TOS=0x00 PREC=0x00 TTL=101 ID=256 PROTO=TCP SPT=6000 DPT=3306 WINDOW=16384 RES=0x00 SYN URGP=0 Dec 2 20:13:34 graviton junglediskserver: Connection to gateway failed: xGatewayTransport - Connection to gateway failed. The first three messages are simple responses to iptables rules I have set up through the LFD firewall. The last message indicates that JungleDisk, which I use for backups can no longer connect to the gateway. Apart from this, there are no interesting messages around this time. EDIT 4 dec: as per Mattdm's request, here is the output of ethtool eth0: (Please not that these are the settings that currently work. If things go wrong again, I will be sure to post this again if necessary. Settings for eth0: Supported ports: [ TP ] Supported link modes: 10baseT/Half 10baseT/Full 100baseT/Half 100baseT/Full 1000baseT/Full Supports auto-negotiation: Yes Advertised link modes: 10baseT/Half 10baseT/Full 100baseT/Half 100baseT/Full 1000baseT/Full Advertised auto-negotiation: Yes Speed: 1000Mb/s Duplex: Full Port: Twisted Pair PHYAD: 1 Transceiver: internal Auto-negotiation: on Supports Wake-on: g Wake-on: d Link detected: yes As per Joris' request, here is also the output of route -n: aron@graviton [~]# route -n Kernel IP routing table Destination Gateway Genmask Flags Metric Ref Use Iface xx.xx.xx.58 0.0.0.0 255.255.255.255 UH 0 0 0 eth0 xx.xx.xx.42 0.0.0.0 255.255.255.255 UH 0 0 0 eth0 xx.xx.xx.43 0.0.0.0 255.255.255.255 UH 0 0 0 eth0 xx.xx.xx.41 0.0.0.0 255.255.255.255 UH 0 0 0 eth0 xx.xx.xx.46 0.0.0.0 255.255.255.255 UH 0 0 0 eth0 xx.xx.xx.47 0.0.0.0 255.255.255.255 UH 0 0 0 eth0 xx.xx.xx.44 0.0.0.0 255.255.255.255 UH 0 0 0 eth0 xx.xx.xx.45 0.0.0.0 255.255.255.255 UH 0 0 0 eth0 xx.xx.xx.50 0.0.0.0 255.255.255.255 UH 0 0 0 eth0 xx.xx.xx.51 0.0.0.0 255.255.255.255 UH 0 0 0 eth0 xx.xx.xx.48 0.0.0.0 255.255.255.255 UH 0 0 0 eth0 xx.xx.xx.49 0.0.0.0 255.255.255.255 UH 0 0 0 eth0 xx.xx.xx.54 0.0.0.0 255.255.255.255 UH 0 0 0 eth0 xx.xx.xx.52 0.0.0.0 255.255.255.255 UH 0 0 0 eth0 xx.xx.xx.53 0.0.0.0 255.255.255.255 UH 0 0 0 eth0 xx.xx.xx.0 0.0.0.0 255.255.255.192 U 0 0 0 eth0 xx.xx.xx.0 0.0.0.0 255.255.255.0 U 0 0 0 eth0 169.254.0.0 0.0.0.0 255.255.0.0 U 0 0 0 eth0 0.0.0.0 xx.xx.xx.62 0.0.0.0 UG 0 0 0 eth0 The bottom xx.62 is my gateway. EDIT december 28th: the problem occurred again and I got the chance to compare some of the outputs of the above tests. What I found out is that arp -an returns an incomplete MAC address for my gateway (which is not under my control; the server is in a shared rack): During failure: ? (xx.xx.xx.62) at <incomplete> on eth0 After service network restart: ? (xx.xx.xx.62) at 00:00:0C:9F:F0:30 [ether] on eth0 Is this something I can fix or is it time for me to contact the data centre?

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  • screen DPI - is there and equivalent command/action to Windows 150% Display

    - by Yekhezkel Yovel
    I have a wide screen of high resolution and I see everything small on it. So In windows I set the display to 150%, I would like to do something similar in Ubuntu. Simply changing screen resolution to lower resolution doesn't help because Ubuntu is in a virtual machine and it simply changes the VM window to the actual resolution. Is there a command or a simple hack that can do the trick? EDIT: I am running Ubuntu as a VirtualBox VM on Windows 7 host.

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  • Server Side Developer Prerequisites

    - by Jking
    I am new to server side development and am currently learning node.js. What sort of networking information should I be familiar with to allow for a smooth learning curve with server side development. Could anyone provide resources pertaining to the information required to get into server programming? To give you a better idea of my standpoint: I do not know how a server interacts with a database [Q: How does a NoSQL database, or database in general, communicate with a server?] I am unsure of how a web stack works [Q: I have heard of LAMP but do not know how Apache, MySQL, and PHP interact. Hopefully this applies to other stacks as well. How do the components of a stack work together? Also, is a MEAN stack an alternative, or is it completely irrelevant to this] I have trivial knowledge of internet protocol [however extremely inefficient][Q: What resources are beneficial when learning about networking, and how much/what knowledge should I acquire to program on the server side] I am unsure of what I am unsure of concerning networking information necessary to start development Information on how the client-server model works would be greatly appreciated

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  • When I add myself "vboxusers" group I an no longer in the "admins" group

    - by R9TySix
    I'm using Ubuntu 11.10 and I installed VirtualBox. This required me to add myself to the vboxusers group but when I add myself to vboxusers group I am no longer be in other groups and especially admins group! When I add myself back to admins group I no longer be am in the vboxusers group ! Commands that I used to add user to "vboxusers": usermod -G vboxusers myusername to add user back to admins group in single user mod: usermod -aG admin myusername

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  • Oracle Virtual Networking Partner Sales Playbook Now Available

    - by Cinzia Mascanzoni
    Oracle Virtual Networking Partner Sales Playbook now available to partners registered in OPN Server and Storage Systems Knowledge Zones. Equips you to sell, identify and qualify opportunities, pursue specific sales plays, and deliver competitive differentiation. Find out where you should plan to focus your resources, and how to broaden your offerings by leveraging the OPN Specialized enablement available to your organization. Playbook is accessible to member partners through the following Knowledge Zones: Sun x86 Servers, Sun Blade Servers, SPARC T-Series Servers, SPARC Enterprise High-End M-Series Servers, SPARC Enterprise Entry-Level and Midrange M-Series Servers, Oracle Desktop Virtualization, NAS Storage, SAN Storage, Sun Flash Storage, StorageTek Tape Storage.

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  • Ubuntu KVM Networking

    - by Guest
    I have two VMs ( linux based VM ) running on a UBUNTU/QEMU KVM. I am looking at a simple networking model, where in the VMs have public address and need to talk to the outside world and the outside world should be able to talk to the VMs as well. I did this Created a bridge with A.B.C.D/16 ( class B address ) eth2 is part of the brige with A.B.C.E /32 host address VM's interface ( through TAP ) has A.B.C.F / 16 address eth2 and VM interface are both part of the bridge. Now however, I am unable to ping these address from the outside world. If i remove eth2 from the bridge, I am able to ping the eth2. Please let me know what is going on. Guest

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  • How do I access an Ubuntu VirtualBox guest at a static IP from an OS X host?

    - by David Siegel
    How does one configure an Ubuntu guest to use a static IP that's visible to an OS X host, and ensure that the static IP is independent of the host's network configuration? I previously used bridged networking for my guest, but I'm constantly moving my host between networks so the guest IP is always different. First, I tried setting the guest network configuration to NAT and forwarding host port 1022 to guest port 22, so I could at least ssh to a fixed address (localhost:1022): $ VBoxManage setextradata "Ubuntu Server" "VBoxInternal/Devices/e1000/0/LUN#0/Config/SSH/Protocol" "TCP" $ VBoxManage setextradata "Ubuntu Server" "VBoxInternal/Devices/e1000/0/LUN#0/Config/SSH/GuestPort" 22 $ VBoxManage setextradata "Ubuntu Server" "VBoxInternal/Devices/e1000/0/LUN#0/Config/SSH/HostPort" 1022 Then, $ ssh localhost -p 1022 ssh: connect to host localhost port 1022: Connection refused But this didn't work (guest has no network access with NAT and OS X refused the connection, as you can see). I'd love a general solution that would let me communicate with my guest at a fixed IP.

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  • " this kernel required an X86-64 CPU, but only detected a i686 CPU"

    - by jy19
    I recently decided to use Virtualbox to run Ubuntu, but I get the message this kernel required an X86-64 CPU, but only detected a i686 CPU I've already enabled virtualization in BIOS, but that doesn't seem to work. Many other solutions suggest that I should download the 32-bit version, and not the 64-bit. I'm not sure about that though, since my computer clearly says "64-bit operating system" under systems. But I might just be mistaken.

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  • How do I access an Ubuntu VirtualBox guest at a static IP from an OS X host?

    - by David Siegel
    How does one configure an Ubuntu guest to use a static IP that's visible to an OS X host, and ensure that the static IP is independent of the host's network configuration? I previously used bridged networking for my guest, but I'm constantly moving my host between networks so the guest IP is always different. First, I tried setting the guest network configuration to NAT and forwarding host port 1022 to guest port 22, so I could at least ssh to a fixed address (localhost:1022): $ VBoxManage setextradata "Ubuntu Server" "VBoxInternal/Devices/e1000/0/LUN#0/Config/SSH/Protocol" "TCP" $ VBoxManage setextradata "Ubuntu Server" "VBoxInternal/Devices/e1000/0/LUN#0/Config/SSH/GuestPort" 22 $ VBoxManage setextradata "Ubuntu Server" "VBoxInternal/Devices/e1000/0/LUN#0/Config/SSH/HostPort" 1022 Then, $ ssh localhost -p 1022 ssh: connect to host localhost port 1022: Connection refused But this didn't work (guest has no network access with NAT and OS X refused the connection, as you can see). I'd love a general solution that would let me communicate with my guest at a fixed IP.

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  • pae kernel required for my cpu [closed]

    - by Edward Meyer
    Possible Duplicate: How can I install 12.04 on a non-PAE CPU? (error “Kernel requires features not present on the CPU: PAE”) Virtualbox install 12.04 guest: “pae not present” After loading ubuntu-12.04.1-desktop-i386.iso into my Oracle VM, the hard drive would not boot because the version for my cpu require the pae kernel. How do I insert the pae kernel or download a copy of ubuntu with the pae kernel?

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  • Ubuntu Server VM: copy paste?

    - by bukzor
    I've installed Ubuntu Server under Virtualbox just to get a nice little shell. I've also installed the VirtualBox "Guest Additions" and set "Shared Clipboard: Bidirectional". I still can't seem to get any copy-paste working. Am I missing something here? I've installed gpm which gives mouse support in server mode (no X), and allows copy-paste using the mouse, but still the VirtualBox integration doesn't work.

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  • Ubuntu Server VM: copy paste?

    - by bukzor
    I've installed Ubuntu Server under Virtualbox just to get a nice little shell. I've also installed the VirtualBox "Guest Additions" and set "Shared Clipboard: Bidirectional". I still can't seem to get any copy-paste working. Am I missing something here? I've installed gpm which gives mouse support in server mode (no X), and allows copy-paste using the mouse, but still the VirtualBox integration doesn't work.

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  • Move/migrate vbox virtual machine to another computer along with snapshots

    - by user53864
    I have sun virtualbox(2.2) installed on windows xp and I've some VMs(ubuntu server) running with many snapshots . How do I move virtualbox VDIs along with all the snapshots to new windows system?. I tried copying the base vdi and creating it newly on a new system and it worked fine but could not move the snapshots of the vms. I even tried copying Virtualbox.xml and machine's xml file to the new system and manually editing the snapshots location to the new place in the virtualbox.xml file, the snapshots are listed in the snapshots tab(but when I checked snapshots location in the vm's settings it's showing the default location having edited it) but when I try to use the snapshots, reverting to current, it's not booting(some snapshots giving grub 2 error, some got stalled at the boot). I also tried export and import but only current state I could export and use it on the new system with no snapshots. Is there any way I could achieve this?. Please need help...

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  • Ubuntu 12.04 Unity fails

    - by user54519
    I am using the latest edition of Virtualbox 4.1.12 and I get the attached when I attempt to launch Unity. Everything is there in the background but it's not displaying the launcher, dash, or panel. I've tried to reboot the VM as well as ensure all updates are installed. I've also tried removing and reinstalling the Guest Additions. I have a screenshot if you'd like to see that, but it won't let me attach it.

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  • Would there be any negative side-effects of sharing /var/cache/apt/ between two systems?

    - by ændrük
    In the interest of conserving bandwidth, I'm considering mounting a VirtualBox host's /var/cache/apt as /var/cache/apt in the guest. Both host and guest are Ubuntu 10.10 32-bit. Would there be any negative consequences to doing this? I'm aware of the more robust solutions like apt-proxy, but I'd prefer this simpler solution if it's possible in order to spare the host the overhead of running extra services.

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  • Achieving A 1600 x 900 Resolution For (Guest OS) Ubuntu Under (Host OS) Windows 7

    - by panamack
    I am running Ubuntu 11.10 as a guest OS using VirtualBox 4.1.16 installed on Windows 7 Ultimate. On my laptop I'd like to be able to run Ubuntu in full screen mode at 1600 x 900. I only have options within the virtual machine to select 4:3 display settings such as 1600 x 1200, 1440 x 1050 etc. I have guest additions installed. At the windows command prompt, I tried typing: VBoxManage setextradata "Virtual Ubuntu Coursera ESSAAS" "CustomVideoMode1" "1600x900x16" This didn't work, still no 1600 x 900 res available in Ubuntu. I tried this having read the following section of the VirtualBox help (this also says something about a 'video mode hint feature' not sure what this means): 9.7. Advanced display configuration 9.7.1. Custom VESA resolutions Apart from the standard VESA resolutions, the VirtualBox VESA BIOS allows you to add up to 16 custom video modes which will be reported to the guest operating system. When using Windows guests with the VirtualBox Guest Additions, a custom graphics driver will be used instead of the fallback VESA solution so this information does not apply. Additional video modes can be configured for each VM using the extra data facility. The extra data key is called CustomVideoMode with x being a number from 1 to 16. Please note that modes will be read from 1 until either the following number is not defined or 16 is reached. The following example adds a video mode that corresponds to the native display resolution of many notebook computers: VBoxManage setextradata "VM name" "CustomVideoMode1" "1400x1050x16" The VESA mode IDs for custom video modes start at 0x160. In order to use the above defined custom video mode, the following command line has be supplied to Linux: vga = 0x200 | 0x160 vga = 864 For guest operating systems with VirtualBox Guest Additions, a custom video mode can be set using the video mode hint feature. UPDATE 02.06.12 I've just tried creating a new virtual machine using the same original disk image I had been given. This had Guest Additions v 4.1.6 installed and provided me with the 1600 x 900 full screen display I want. It's after I then install Guest Additions v 4.1.16 (the version included with my VirtualBox installation) that my only choices are 4:3 displays e.g. 1600 x 1200. Seems this is the cause.

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  • VMWare Player 5.0 Upgrade - Bridged Networking No Longer Works

    - by Syndog
    I've been using VMWare Player 4 on my Windows 7 PC, running my VMs under a bridged networking configuration without any problem. I settled on bridged networking two reasons... I often use VMs to host web applications for test purposes. I never could get NAT to work for me anyway, but no love lost, considering reason #1. Now that I've upgraded to VMWare Player 5, the situation has completely reversed. In other words, bridged networking no longer works at all, and NAT does. Has anyone else come across this? Any ideas on getting bridged networking to work again? This happens with both Windows and Linux guest OSes. VMWare Tools has been fully updated. I've tried the usual vmnetcfg.exe utility fix, to no avail.

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  • Pinterest and Social Commerce: The Social Networking Site Retailers Shouldn’t Ignore

    - by Jeri Kelley
    If you are in the midst of remodeling your home, researching the latest spring fashion trends, or simply trying to figure out what to cook for dinner you’ve probably been on Pinterest, and like me, find it extremely useful for generating new ideas and storing them all in one place. Gone are the days of folding over corners of magazines or bookmarking the URL of a Web page – Pinterest makes it easy for you to “pin” ideas, photos, links, and more to virtual bulletin boards where your “followers” can repin, like, and share. As a consumer, Pinterest has gained my attention and I’m definitely not the only one. According to a Monetate infographic, Pinterest’s unique visitors increased 329% from September to December 2011. With this explosion of users, what does it mean for social commerce? Also according to Monetate, Pinterest is one of the top traffic drivers for retailers – driving even more traffic than popular social networking sites like Google+.  For businesses, creating a presence on Pinterest is a great way to extend the reach of your brand, increase inbound links, and drive more traffic to your site. Socialnomics has a great post on how some of the biggest retail brands are using Pinterest to connect with consumers, offer cool content, and engage on a more personal level. When evaluating your social commerce program, while Facebook still delivers the most referrals, Pinterest shouldn’t be ignored as a way to help reach and connect with as many consumers as possible.

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  • Networking beim Vertriebsstammtisch

    - by A&C Redaktion
    Kennen Sie schon die Oracle Vertriebsstammtische? Mit dem neuen Format bieten wir unseren Partnern Networking in der reinster Form! Unsere Stammtische richten sich an alle Partner, die zuverlässige Informationen aus erster Hand möchten. Als Hersteller der weltweit umfassendsten Palette offener Unternehmenssoftware und Hardware bietet Oracle ein vollständiges Produktportfolio an. Diskutieren Sie mit uns über die gemeinsamen Chancen, die sich aus dem Ansatz „Engineered Systems“ und „Oracle on Oracle“ ergeben. Welche Synergien können wir erfolgreich gemeinsam nutzen, um den Markt zu erobern? Nehmen Sie teil und spüren Sie die Philosphie, die von den Teilnehmern unserer Partner gelebt werden soll. Im Anschluss an den fachlichen Teil laden wir Sie herzlich zum praktischen Teil des interaktiven Austausches ein! Die Teilnahme ist ausschließlich Oracle Partnern mit einer gültigen Oracle PartnerNetwork Mitgliedschaft vorbehalten und, unter Beachtung der aktuellen Teilnahmebedingungen, kostenlos. Agenda: 15:00-17:00 Alles zu den Software- und Hardware Produktneuheiten von der Oracle OpenWorld 17:00-17:30 Um 17:00 Uhr bitten wir alle Teilnehmer und Referenten, in eine Kochschule in direkter Nähe zu gehen/zu fahren - um dort den kulinarischen Part zu erleben: gemeinsam kochen, diskutieren und essen. 17:30-22:00 Der praktischen Teil dieses Vertriebsseminars findet in einer Kochlocation direkt im Anschluss statt.(Ihre Anmeldung gilt für das Vertriebsseminar und Ihre Teilnahme am praktischen Teil, dem Kochevent) Die nächsten Termine: 08.11.2012 bei Oracle in Düsseldorf mit anschließendem Abendessen19.11.2012 bei Oracle in Berlinmit anschließendem Abendessen28.11.2012 bei Oracle in Berlinmit anschließendem Abendessen

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  • Networking beim Vertriebsstammtisch

    - by A&C Redaktion
    Kennen Sie schon die Oracle Vertriebsstammtische? Mit dem neuen Format bieten wir unseren Partnern Networking in der reinster Form! Unsere Stammtische richten sich an alle Partner, die zuverlässige Informationen aus erster Hand möchten. Als Hersteller der weltweit umfassendsten Palette offener Unternehmenssoftware und Hardware bietet Oracle ein vollständiges Produktportfolio an. Diskutieren Sie mit uns über die gemeinsamen Chancen, die sich aus dem Ansatz „Engineered Systems“ und „Oracle on Oracle“ ergeben. Welche Synergien können wir erfolgreich gemeinsam nutzen, um den Markt zu erobern? Nehmen Sie teil und spüren Sie die Philosphie, die von den Teilnehmern unserer Partner gelebt werden soll. Im Anschluss an den fachlichen Teil laden wir Sie herzlich zum praktischen Teil des interaktiven Austausches ein! Die Teilnahme ist ausschließlich Oracle Partnern mit einer gültigen Oracle PartnerNetwork Mitgliedschaft vorbehalten und, unter Beachtung der aktuellen Teilnahmebedingungen, kostenlos. Agenda: 15:00-17:00 Alles zu den Software- und Hardware Produktneuheiten von der Oracle OpenWorld 17:00-17:30 Um 17:00 Uhr bitten wir alle Teilnehmer und Referenten, in eine Kochschule in direkter Nähe zu gehen/zu fahren - um dort den kulinarischen Part zu erleben: gemeinsam kochen, diskutieren und essen. 17:30-22:00 Der praktischen Teil dieses Vertriebsseminars findet in einer Kochlocation direkt im Anschluss statt.(Ihre Anmeldung gilt für das Vertriebsseminar und Ihre Teilnahme am praktischen Teil, dem Kochevent) Die nächsten Termine: 08.11.2012 bei Oracle in Düsseldorf mit anschließendem Abendessen19.11.2012 bei Oracle in Berlinmit anschließendem Abendessen28.11.2012 bei Oracle in Berlinmit anschließendem Abendessen

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  • 12.10 Wireless networking

    - by user108594
    I downloaded ubuntu 12.10 using WUBI and cannot connect to the internet. I removed it and downloaded ubuntu 12.04 still cannot connect. This I assume rules out the program being the problem. I reinstalled 12.10. When loaded I get the same message W/red (x) stating Internet not connected. I went to the Settings drop down box and it does not reveal the network list but (enable networking has a ck mark). Am running a HP Laptop with a w/7/64 OS that has a kill switch that indicates (orangeno connection) I downloaded 12.10 on my desktop (on the same network) and everything OK. I tried to follow the instructions in the help menu but got lost and confused . Sincerely Dan Additional Info per request Broadcom 802.11b/g Wlan Internal pc [hp laptop] P.S. I've been out of town for about a month. TKS for your gitback I did install 12.10 via cd and everything ok,but retried alongside 7 and unable to connect to internet,also took laptop and hard wired using ethernet cable and everything ok. stumped again and running out of ideas!!!

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  • networking without port forwarding

    - by Wallacoloo
    I'm trying to add networking functionality to my game. I want any user to be able to host the game, and anyone to be able to connect as a client. The client sends info to the host about their player's position, etc. When the host receives a message, it validates it and then broadcasts it to its other clients. I will primarily be dealing with UDP, but will also need TCP for chat & lobby stuff. The problem is that I can't seem to get a packet sent from the client to the host or the other way around without enabling port forwarding on my router. But I don't think this is necessary. I believe the reason I need port forwarding is because I want to send a packet from 1 computer on a LAN to another computer on a different LAN, but neither of them have a global ip address since they're in a LAN. So really, I can only send packets targeting the other network's router, which must forward it on to the machine I want to reach. So how can I do this without port forwarding? Somehow a web server can communicate with my computer, which doesn't have a global ip, without port forwarding. And I've played plenty of multi-player games that don't require me to enable port forwarding. So it must be possible. Btw, I'm using SDL_Net. I don't think this will change anything though.

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  • Querying Networking Statistics: dlstat(1M)

    - by user12612042
    Oracle Solaris 11 took another big leap forward in networking technologies providing a reliable, secure and scalable infrastructure to meet the growing needs of today's datacenter implementations. Oracle Solaris 11 introduced a new and powerful network stack architecture, also known as Project Crossbow. From Solaris 11 onwards, we introduced a command line tool viz. dlstat(1M) to query network statistics. dlstat (for datalink statistics) is a statistics querying counterpart for dladm(1M) - the datalink administration tool. The tool is very easy to get started. Just type dlstat on a shell prompt on Solaris 11 (or later). For example,: # dlstat LINK IPKTS RBYTES OPKTS OBYTES net0 834.11K 145.91M 575.19K 104.24M net1 7.87K 2.04M 0 0 In this example, the system has two datalinks net0 and net1. The output columns denote input packets/bytes as well as output packets/bytes. The numbers are abbreviated in xxx.xxUnit format. However, one could get the actual counts by simply running dlstat -u R (R for raw): # dlstat -u R LINK IPKTS RBYTES OPKTS OBYTES net0 834271 145931244 575246 104242934 net1 7869 2036958 0 0 In addition, dlstat also supports various subcommands dlstat help The following subcommands are supported: Stats : show-aggr show-ether show-link show-phys show-bridge For more info, run: dlstat help {default|} I will only describe couple of interesting subcommands/options here. For a comprehensive description of all the dlstat subcommands refer dlstat's official manual . For NICs that support multiple rings (e.g. ixgbe), dlstat show-phys -r allows us to query per Rx ring statistics. For example: dlstat show-phys -r net4 LINK TYPE INDEX IPKTS RBYTES net4 rx 0 0 0 net4 rx 1 0 0 net4 rx 2 0 0 net4 rx 3 0 0 net4 rx 4 0 0 net4 rx 5 0 0 net4 rx 6 0 0 net4 rx 7 0 0 In this case, net4 is just a vanity name for an ixgbe datalink. This view is especially useful if one wants to look at the network traffic spread across all the available rings. Furthermore, any of the dlstat commands could be run with -i option to periodically query and display stats. For example, running dlstat show-phys -r net4 -i 5 will emit per Rx ring stats every 5 seconds. This is especially useful while analyzing a live system. Similarly, dlstat show-phys -t could be used to query per Tx ring stats. -r and -t could also be combined as dlstat show-phys -rt to query both Rx as well as Tx stats at the same time. Finally, there is also a quick way to dump ALL the stats. Just run dlstat -A. You probably want to redirect this output to a file because you are going to get a whole load of stats :-).

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