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  • solaris + dladm + what is unknown state and how to bring it to up?

    - by yael
    I installed Solaris 10 on my netra machine from dladm show-dev I can see which interface are down or up all interfaces are connected to the Cisco switch , and all leds are light's on all LAN cards but I not understand why all interfaces except e1000g0 are in unknown ? Please advice how to bring the unknown interfaces to up ? # dladm show-dev e1000g0 link: up speed: 1000 Mbps duplex: full e1000g1 link: unknown speed: 0 Mbps duplex: unknown e1000g2 link: unknown speed: 0 Mbps duplex: unknown e1000g3 link: unknown speed: 0 Mbps duplex: unknown nxge0 link: unknown speed: 0 Mbps duplex: unknown nxge1 link: unknown speed: 0 Mbps duplex: unknown nxge2 link: unknown speed: 0 Mbps duplex: unknown nxge3 link: unknown speed: 0 Mbps duplex: unknown

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  • Shared firewall or multiple client specific firewalls?

    - by Tauren
    I'm trying to determine if I can use a single firewall for my entire network, including customer servers, or if each customer should have their own firewall. I've found that many hosting companies require each client with a cluster of servers to have their own firewall. If you need a web node and a database node, you also have to get a firewall, and pay another monthly fee for it. I have colo space with several KVM virtualization servers hosting VPS services to many different customers. Each KVM host is running a software iptables firewall that only allows specific ports to be accessed on each VPS. I can control which ports any given VPS has open, allowing a web VPS to be accessed from anywhere on ports 80 and 443, but blocking a database VPS completely to the outside and only allowing a certain other VPS to access it. The configuration works well for my current needs. Note that there is not a hardware firewall protecting the virtualization hosts in place at this time. However, the KVM hosts only have port 22 open, are running nothing except KVM and SSH, and even port 22 cannot be accessed except for inside the netblock. I'm looking at possibly rethinking my network now that I have a client who needs to transition from a single VPS onto two dedicated servers (one web and one DB). A different customer already has a single dedicated server that is not behind any firewall except iptables running on the system. Should I require that each dedicated server customer have their own dedicated firewall? Or can I utilize a single network-wide firewall for multiple customer clusters? I'm familiar with iptables, and am currently thinking I'll use it for any firewalls/routers that I need. But I don't necessarily want to use up 1U of space in my rack for each firewall, nor the power consumption each firewall server will take. So I'm considering a hardware firewall. Any suggestions on what is a good approach?

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  • Homegroup should be working, but doesn't

    - by Tim
    I have Win7 installed on both my PC and laptop. When I choose to make a homegroup I can go through the steps of creating, getting password, then joining it from the other computer and it says that it all connects properly. But when I go to the homegroup tab it always says no other computers connected. If I look in the settings it will say "connected to suchandsuch homegroup" but the comps won't show. Also, on my PC, when I tick the boxes in the homegroup settings on what libraries I want to share, then click on save settings, it shuts down the settings window and when I re-open it the library tick boxes are all unticked again. Yet, I have had no problems with the tick boxes stayin ticked on the laptop. I have tried cancelling and remaking the homegroup, have tried making it on both computers, and have tried disabling and re-enabling the network connectors but it still won't work. At my old house we had 3 PCs running win 7 and 2 of them could homegroup together fine but mine never could as it was getting the same problem I am getting now. I feel like I am the only one on the planet with this problem. Can anybody help?

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  • Creating basic, redundant gigE or IB storage network for Xen?

    - by StaringSkyward
    With only a modest budget, I want to move my 4 xen servers over to network storage -either NFS or iSCSI which will be determined based on how well it performs when we test it (we need good throughput and it must continue to work through link and switch failure tests). We may add another couple of xen servers at some point when this is done. I don't know much about the design and operation of storage networks, so would really appreciate some hints from those with experience. The budget is around $3,800 excluding the storage appliance. I am currently thinking these are my options to remain on budget: 1) Go for used infiniband hardware and aim for 10gb performance. 2) Stick with gig ethernet and buy some new switches (cisco or procurve) to create a storage-only ethernet LAN. Upgrade to 10gigE later but try to use hardware capable of it where possible to reduce upgrade costs. I have seen used, warrantied infiniband switches at reasonable prices (presumably because big companies are converging on 10gbit ethernet?) and the promise of cheap 10gb is attractive. I know nothing about IB, so here come the questions: Can I buy 2 x switches and have multiple HBAs in my xen and storage nodes to get redundancy and increased performance without complexity or expensive management software costs? If so, can you point me to some examples? Do NFS and iSCSI work just the same regardless? Is IB a sensible choice or could/should I use ethernet or FC on the same budget - I'm keen not to get boxed into a corner for future upgrades, however. For the storage I am likely to build a storage server using nexentastor with the intention that I can later add more disks, SSDs and add another server to provide a failover option at the storage level. An HP LeftHand starter SAN is also under consideration, too. Thanks in advance.

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  • How does NMap decide to print a progress line?

    - by Andrew Bolster
    Checking a larger subnet than I normally do; mapping out a cluster suite in a university for a traffic mapping project (permission attained), and I was wondering something. NMap usually prints its progress periodically, but I'm unclear to what that 'periodically' is, because the cirrent scan printed a line for basically every 100th of a percent up to 1% done, then one at 1.5%, and has said nothing since. I suspect that it changes at different 'levels' but does anyone have an actual answer?

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  • private address in traceroute results

    - by misteryes
    I use traceroute to check paths on a remote host, and I notice that there are some private IPs, like 10.230.10.1 bash-4.0# traceroute -T 132.227.62.122 traceroute to 132.227.62.122 (132.227.62.122), 30 hops max, 60 byte packets 1 194.199.68.161 (194.199.68.161) 1.103 ms 1.107 ms 1.097 ms 2 sw-ptu.univ.run (10.230.10.1) 1.535 ms 1.625 ms 2.172 ms 3 sw-univ-gazelle.univ.run (10.10.20.1) 6.891 ms 6.937 ms 6.927 ms 4 10.10.5.6 (10.10.5.6) 1.544 ms 1.517 ms 1.518 ms why there are private addresses near the host? what are the purposes that these private addresses are used? I mean why they want to put the public IP behind private IPs? thanks!

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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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  • How can I view my IIS hosted sites on other machines on my network

    - by Truegilly
    Hello, at home i have a simple network setup conatining 2 machines and 1 belkin router. On one machine i have a site hosted with IIS7. Rather than the standard localhost/index.htm address i have added an entry in the HOSTS file pointing the local ip (127.0.0.1) to this domain - www.mysite.dev. i can access the site with www.mysite.dev with no problem. what i would like to do is be able to view this site from my other machine on the network. initially i assumed this could be done with a url like so MACHINE-NAME/www.mysite.dev, but the connection always times out. But I can ping MACHINE-NAME without problems. For testing purposes i have diabled the windows firewall on both machines but to no joy. Like a typical web developer, my techy/network skills are pretty poor. Can anyone see where im going wrong ?? thank you for your time Truegilly :)

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  • HAProxy causing delay

    - by user1221444
    I am trying to configure HAProxy to do load balancing for a custom webserver I created. Right now I am noticing an increasing delay with HAProxy as the size of the return message increases. For example, I ran four different tests, here are the results: Response 15kb through HAProxy: Avg. response time: .34 secs Transacation rate: 763 trans/sec Throughput: 11.08 MB/sec Response 2kb through HAProxy: Avg. response time: .08 secs Transaction rate: 1171 trans / sec Throughput: 2.51 MB/sec Response 15kb directly to server: Avg. response time: .11 sec Transaction rate: 1046 trans/sec throughput: 15.20 MB/sec Response 2kb directly to server: Avg. Response time: .05 secs Transaction rate: 1158 trans/sec Throughput: 2.48 MB/sec All transactions are HTTP requests. As you can see, there seems to be a much bigger difference between response times for when the response is bigger, than when it is smaller. I understand there will be a slight delay when using HAProxy. Not sure if it matters, but the test itself was run using siege. And during the test there was only one server behind the HAProxy(the same that was used in the direct to server tests). Here is my haproxy.config file: global log 127.0.0.1 local0 log 127.0.0.1 local1 notice maxconn 10000 user haproxy group haproxy daemon #debug defaults log global mode http option httplog option dontlognull retries 3 option redispatch option httpclose maxconn 10000 contimeout 10000 clitimeout 50000 srvtimeout 50000 balance roundrobin stats enable stats uri /stats listen lb1 10.1.10.26:80 maxconn 10000 server app1 10.1.10.200:8080 maxconn 5000 I couldn't find much in terms of options in this file that would help my problem. I have heard suggestions that I may have to adjust a few of my sysctl settings. I could not find a lot of information on this however, most documentation is for Linux 2.4 and 2.6 on the sysctl stuff, I am running 3.2(Ubuntu server 12.04), which seems to auto tuning, so I have no clue what I should or shouldn't be changing. Most settings changes I tried had no effect or a negative effect on performance. Just a notice, this is a very preliminary test, and my hope is that at deployment time, my HAProxy will be able to balance 10k-20k requests/sec to many servers, so if anyone could provide information to help me reach that goal, it would be much appreciated. Thank you very much for any information you can provide. And if you need anymore information from me please let me know, I will get you anything I can.

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  • Separating two networks

    - by Farhan Ali
    I have two routers, R1 and R2. R1 (a stock linksys router running dd-wrt) is connected to internet and is serving internet to a network of 5 devices/PCs running a DHCP server, with a network of 192.168.1.0/24. R1 also serves internet services to R2. R2 (a ubuntu server 12.04) gets internet from R1. R2 has 3 PCs attached to it, runs a DHCP server with a network of 172.22.22.0/24. My requirement is that the clients on both sides should not talk to each other at all – with the exception that R1 clients may access the R2 router through its IP of 192.168.1.x. At the moment, R2 clients are able to ping R1 clients, which is unacceptable, whereas R1 clients cannot ping R2 clients, which is OK. I believe iptables could be set up but I don't know how.

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  • Online network mining software

    - by ron
    A year ago I stumbled upon a website which provided an online application for building a network online. For example, I entered some urls and phrases, and it automatically searched them for news, inserted the connections between them, etc. I can't find it now. Do you know such software?

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  • Why is Wifi data transfer is slow?

    - by Ali Azam Rana
    I have a wifi router which was attached with my modem, and the pc was connected to the wifi router through an ethernet cable. Yesterday I moved my modem and router to another room and connected my PC with wifi through an external wifi usb dongle (tp-link tl-w722n). I noticed that the file transfer speed from my cell to PC via wifi is greatly affected. I am not clear why is this happening because although PC is now connected through wifi but the dongle supports more than 54Mbps which is still enough.

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  • How do I decrypt WPA2 encrypted packets using Wireshark?

    - by Rox
    I am trying to decrypt my WLAN data with Wireshark. I have already read and tried eveything on this page but without any success (well, I tried the example dump on that page and succeeded, but I fail with my own packets). I caught the four-way handshake from another client connecting to the network. My network info is as follows: SSID: test Passphrase: mypass The above info would give this preshared key: 58af7d7ce2e11faeab2278a5ef45de4944385f319b52a5b2d82389faedd3f9bf In Wireshark in the Preferences--IEEE 802.11 I have set this line as Key 1: wpa-psk:58af7d7ce2e11faeab2278a5ef45de4944385f319b52a5b2d82389faedd3f9bf I have tried the different options of "Ignore the protection bit" but none works. What could I have missed?

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  • Access Home Network Server via External Address (DSL vs Cable)

    - by Dominic Barnes
    For the last few months, I've been using a server on my home network for basic backups and hosting some small websites. Up until this past week, I've been using Comcast (cable) as an ISP and now that I've moved into an apartment, I'm using AT&T. (DSL) I've set up dynamic DNS and I can verify it works externally. However, I can't seem to access the public address from within the local network. Is there something DSL does differently from Cable that makes this frustration possible?

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  • Why do I often have to refresh pages I navigate to once for them (or content in them) to load?

    - by GetOutOfBox
    I have noticed a bizarre pattern when using my PC, that when I open a link to a website, it often will often take a very long time to load, or time out. Sometimes content on the website will be drawn, but again, it seems to get "stuck" for an unusual amount of time before finishing. Most affected is Youtube; almost every time I navigate to a youtube video from another website such as Google, the video will not begin playing, but will instead just display the player controls with a black screen where the video should be and the buffering symbol, usually before displaying an error such as "The video failed to load". The unusual part of this problem is that whenever this happens, refreshing the page always causes it to load almost immediately the second time around, without any problems. Note that I'm not talking about how some browsers will dump whatever has been cached to the "pallet" briefly when the page is refreshed or loading stopped; but that the second time loading the website being faster. I have done my best to rule out some of the obvious causes: My Windows 7 desktop computer is the only device that seems to be affected. I use Firefox on it (latest version, flash updated, etc). My connection has more than enough bandwidth (30 megabits down, 4 up), and I've even tried QoSing all other devices to make sure this isn't happening due to usage spikes. Wireshark is not showing any clearly unusual network activity (i.e frequently dropped packets).

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  • How to route to a secondary interface on the same physical ethernet?

    - by sjose3612611
    INTERNET<->(wan)BRIDGED_DEVICE(lan)<->ETH_ROUTER<->LAN Problem: Need to access web server on BRIDGED_DEVICE's LAN from INTERNET via ROUTER (BRIDGED_DEVICE's web server cannot be accessed form INTERNET since it has no Public management IP). Cannot configure bridged device. It has a static IP on its LAN to which its web server binds. Attempt: Create a secondary/alias WAN Interface on ETH_ROUTER (e.g Primary: eth0.1 (for internet access) and Secondary: eth0.2 (for accessing web server on BRIDGED_DEVICE), (No VLANs). eth0.1 has a public IP; eth0.2 has a static private IP in the BRIDGED_DEVICE's subnet (e.g 10.0.X.Y). Iptables on ETH_ROUTER: Added a port forward (DNAT) from eth0.1 to eth0.2: iptables -t nat -I PREROUTING -i eth0.1 -p tcp --dport 80 -j DNAT --to-destination 10.0.X.Y iptables -t nat -I POSTROUTING -o eth0.2 -s 10.0.X.0/24 -j MASQUERADE Stateful firewall w/ overall drop policy on FORWARD chain, hence: iptables -I FORWARD -i eth0.1 -d 10.0.X.Y -p tcp --dport 80 -j ACCEPT Can ping from ETH_ROUTER to BRIDGED_DEVICE but unable to reach the web server from Internet. I see packet cont increasing for the DNAT rule but not sure where it disappears in the ETH_ROUTER after that. ETH_ROUTER is the only device that can be configured to achieve this. If familiar with this scenario, please suggest what I may be missing or doing wrong here or suggest techniques to debug?

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  • Running docker in VPC and accessing container from another VPC machine

    - by Bogdan Gaza
    I'm having issues while running docker in AWS VPC. Here is my setup: I've got two machines running in VPC: 10.0.100.150 10.0.100.151 both having an elastic IPs assigned to them, both running in the same internet enabled subnet. Let's say I'm running a web server that serves static files in a container on the 10.0.100.150 machine the container: IP: 172.17.0.2 port 8111 is forwarded on the 8111 port on the machine. I'm trying to access the static files from my local machine (or another non-VPC machine also tried an EC2 instance not running in the VPC) and it work flawlessly. If I try to access the files from the other machine (10.0.100.151) it hangs. I'm using wget to pull the files. Tried to debug it with tcpdump and ngrep and that I have seen is that the request reaches the container. If I ngrep on the host machine I see the requests going in but no response going back. If I ngrep on the container I see the requests going in and the response going back. I've tried multiple iptables setups (with postrouting enabled, with manually forwarding ports etc) but no success. Help in any way - even debugging directions would be much appreciated. Thanks!

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  • Unable to connect to cable modem when connected to VPN

    - by Spuas
    the scenario is as follows: First I have a cable modem which gives the internet connection. The network is 192.168.0.0/24 and its IP is 192.168.0.1 Second line, I have a router connected to the cable modem. Its "outside" IP is 192.168.0.12. This router creates network 192.168.123.0/24 and its IP there is 192.168.123.254. My computer is wired to the router with IP 192.168.123.126. At this point I am able to access both devices web interfaces by their IPs on a browser (192.168.123.254 for the router and 192.168.0.1 for the cable modem). The problem I have is when I connect to a VPN from the computer. Then I am connected to a second network 10.0.0.0/24 and I get IP 10.0.0.200 (along with 192.168.123.126). I can connect to the router but then I loose connectivity to the cable modem: I cannot acces it through the browser, neither making a ping to it or a tracert. I have tried to add a new route to the windows routes by typing route ADD 192.168.0.1 MASK 255.255.255.0 192.168.123.254 but I cannot access it anyway... Am I missing something on the route adding? Which is the propper way of doing this? Thanks

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  • Are same IP address with different submask unique?

    - by xEnOn
    In a same block of IPv4 addresses, can there be same IPs with different submasks? For example, can I have this: 180.70.65.140/26 180.70.65.140/25 180.70.65.140/24 All the 3 addresses above have the same numbers but different subnet mask. Are all the 3 addresses distinct of their own? In other words, 180.70.65.140/25 belongs to User A, 180.70.65.140/25 belongs to User B and 180.70.65.140/24 belongs to User C? After applying the submask, their network addresses look like this: 180.70.65.140/26 --> 180.70.65.128/26 180.70.65.140/25 --> 180.70.65.128/25 180.70.65.140/24 --> 180.70.65.0/24 If the addresses are recognised uniquely, how is it so? How would each of the these addresses being recognised to be unique? I am thinking like once I have 180.70.65.140/26, I can't reuse the same numbers of 180.70.65.140 again but since classless is meant to increase the number of IP addresses, it would do much if I can't reuse.

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  • Social network for internal company use

    - by khelll
    I'm seeking a social network app for employees in the company that can do the following: allows people to communicate within a company or across everyone on the social network (they can have access to a group or to everyone) post and archive interesting links, documents, etc. start a thread that goes to a group or to everyone lookup people’s info (profile) integrate w email so I can know if someone posts something new or responds to a questions Open source + customized deployment is a plus.

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  • Ping server NETBIOS name returns wrong IP and "Destination host unreachable"

    - by music2myear
    Problem server is Windows 2008 R2 VM running on VMWare ESXi 4 host. Single network adapter manually assigned single IP address (192.168.1.11). When I ping the server from any other network computer, it returns 192.168.1.124 and "Destination host unreachable". Yesterday I found a second network adapter assigned to this server with an IP of 169.254... indicating it had no real valid IP. Using the MAC addresses I determined which adapter was not needed/not wanted, and removed it using VMWare systems. This is the network Printer Server and, understandably, nothing is printing right now. I've looked at the solutions here Why was my ping answered by a different IP address than the one pinged? and they aren't applicable to my situation for the following reasons: Output of arp -a on another computer returns the correct IP address (.1.11) assigned to the correct MAC address, the incorrect IP .1.124 is not listed, and the MAC of the network adapter I removed yesterday is not listed at all. I checked out the Microsoft KB article which listed pretty much my exact symptoms ( http://support.microsoft.com/kb/981953 ) and it says to check binding orders and look for hidden adapters. But there are no hidden adapters, and there is only one Network Adapter listed in the Binding Order list. Essentially, I can communicate from the server TO any other network device, but I cannot communicate from any other network device TO the server. Help! UPDATE: Solution found, see this solution for the details.

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