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  • dlink arp spoofing prevention

    - by Wiploo
    someone can help me understanding arp spoofing prevention on dlink dgs-3100 (ftp://ftp2.dlink.com/PRODUCTS/DGS-3100-48P/REVA/DGS-3100-48P_MANUAL_3.60_EN.PDF). I'd like to protect my gateway MAC/IP from spoofing so I'have tryed to add a rule "IP: 192.168.1.1 MAC: aa-aa-aa-aa-aa-aa" flagging all the port of the switch as untrusted. When I apply the rule I lose connection to all pc attached to the switch. I certanly made some errors, but I can't understand what is wrong. Best Regards

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  • Ubuntu Laptop as a wireless hotspot on bridge mode

    - by nixnotwin
    I have a wired router to which my ubuntu laptop connects via ethernet. The wierless NIC of the laptop acts as a wireless hotspot on master mode. I use hostapd fo this. I have bridged eth0 and wlan0, so my wireless clients that connect to my laptop over wifi get ip from the wired router via dhcp, so the devices get registered at the wired router ( and the laptop is just an access point). I use the following commands to get my laptop+accesspoint working: sudo brctl addbr br0 sudo brctl addif br0 eth0 sudo hostapd /etc/hostapd/hostapd.conf & sudo dhclient -d br0 & sudo ifconfig wlan0 192.168.1.15 netmask 255.255.255.0 up sudo brctl addif br0 wlan0 These commands enable me to access internet on my wireless clients and also on the laptop which is acting as wireless accesspoint. But if I reboot the wired router (without rebooting the laptop that is acting as accesspoint), Internet access on the laptop+accesspoint gets lost, but on wireless clients it works fine. Even I have not been able to figure out a command which will reset the laptop interfaces to default settings, so everytime the router reboots, I have to reboot the laptop too to get into default settings so that I can re-enter the above mentioned commands. My first question is How can I have my bridge+accesspoint up and running even-though the router reboots? And is there a command to set the interfaces to a default state? (ifdown -a doesn't work, after issuing the command the bridge still remained).

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  • Wireless disconnects every 30 minutes

    - by Kez
    I have had a look through all the related questions and I get the feeling my problem is unique. My wireless connection disconnects every 30 minutes, for maybe 1 to 3 seconds. If I am browsing the web while it happens, I get the page cannot be displayed error message. I have checked the event logs as I was curious to know if there was anything in there. There is. Event 8033: BROWSER - The browser has forced an election on network \Device\NetBT_Tcpip_{B919CC30-25A9-45DD-A09F-549A6262FC9E} because a master browser was stopped. Reported exactly every 30 minutes which coincides with my wireless problem. I am running Windows 7 Ultimate, 32-bit. My wireless is Realtek RTL8187 integrated into a ASUS P5K-E/Wifi motherboard. It is on a workgroup and has never been on a domain. This problem does not affect any other computers. Wireless reception is great, and I have ensured that the wireless unit is transmitting on a frequency not used by any nearby wireless basestations. How can I fix this pesky problem?

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  • Windows 7 fails to connect to the internet a few minutes after startup

    - by SageTheGreat
    Problem Earlier today, when I turned on my desktop computer, my internet connection works fine. Cryptocurrency miners connecting and hashing as usual and I can browse websites. But after a few minutes, my miner fails indicating that there is something wrong with my internet connection. Tried refreshing my browser and is stuck at "resolving host", and then presented me an error. After that, i can't browse sites anymore. But the weird thing is that the network icon in Windows 7 shows no signs of problems. Solutions Made Restarted my computer without doing anything: Problem persists. Tried using the network troubleshooter of windows: Reported no problems Stopped bonjour still no progress. Loaded windows using Last good config: still no progress. Restarted Modem: No change. Current Status I currently did a system restore to my system to a point before installing the latest update from Microsoft. Because earlier today, I installed some updates and after that, the problem started to appear. (After system restore, same problem.) Latest Programs installed before the problem MS Visual Studio 2013 (but internet still worked fine after the install). I hope someone could provide answers on this problem. It is my first time encountering this. EDIT: Additional Info OS: Windows 7 SP1 64-bit AV: Avast Free Antivirus Internet Connection Type: Ethernet It appears that my Laptop can't even connect to the machine thru Remote Desktop My laptop and phone on WiFi works fine and can connect to the internet. EDIT 2: Whenever I boot into Safe Mode, my Internet is fine.

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  • Ubuntu with KVM guest VM and broken bridges

    - by MadPsy
    I have an Ubuntu box with a KVM guest VM running. They use bridging so the guest VM attaches to the physical network of its host. The guest VM has 2 NICs in 2 different bridges. First NIC of the VM is tap5 and is in bridge br0 br0 8000.46720f5c572e no eth0.500 tap5 Second NIC of the VM is tap2 and is in bridge br100 br100 8000.76ad2fc96661 no eth0.100 eth0.101 eth0.103 eth0.104 eth0.105 tap2 On the host, br0 has an IP and br100 does not 21: br0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP link/ether 46:72:0f:5c:57:2e brd ff:ff:ff:ff:ff:ff inet 192.168.100.4/24 brd 192.168.10.255 scope global br0 inet6 fe80::d6ae:52ff:febe:777/64 scope link valid_lft forever preferred_lft forever On the guest, its eth0 and eth1 interfaces both have IP addresses 2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000 link/ether 00:3e:61:fb:7a:da brd ff:ff:ff:ff:ff:ff inet 192.168.100.6/24 brd 192.168.100.255 scope global eth0 inet6 fe80::23e:61ff:fefb:7ada/64 scope link valid_lft forever preferred_lft forever 3: eth1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000 link/ether 00:3e:61:fb:7a:ea brd ff:ff:ff:ff:ff:ff inet 172.16.50.129/25 brd 172.16.50.255 scope global eth1 inet6 fe80::23e:61ff:fefb:7aea/64 scope link valid_lft forever preferred_lft forever On the guest VM, a tcpdump of its eth1 interface (tap2) shows traffic from its eth0 interface (tap5), as if the 2 bridges are themselves bridged. This means any interface on br100 is now bridged across to br0 - which is completely broken. root@chillispot:~# tcpdump -c 1 -n -v -i eth1 net 192.168.100.0/24 tcpdump: listening on eth1, link-type EN10MB (Ethernet), capture size 65535 bytes 16:31:24.175583 IP (tos 0x0, ttl 64, id 48054, offset 0, flags [DF], proto TCP (6), length 148) 192.168.100.6.22 > 192.168.100.4.59505: Flags [P.], cksum 0x6c2b (correct), seq 1056321648:1056321744, ack 398642983, win 1700, options [nop,nop,TS val 197473436 ecr 200655363], length 96 What could be bridging the 2 bridges, except the guest VM (which is a stock Ubuntu install)? I am at a complete loss! Thanks.

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  • Mikrotik server networks and Cain & Abel

    - by user269742
    I'm connected to the internet via a mikrotik server network. Recently, I read about that scaring application named Cain & Abel and all the capabilities it offered for malicious users. I don't know if anyone on my network is using or even aware of such application but my questions are: 1- How to protect myself from this program? 2- How to know if someone using such application against me? 3- Is Tor Bundle capable of protecting me from Cain & Abel? 4- If I filled my e-mail password via SSL page, Can Cain & Abel collect it? 5- Is it safe to use SKYPE or Yahoo Messenger voice chat if some one using Cain & Abel on my network?

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  • Multicast in private LAN with different subnets

    - by Gobliins
    after i read Multicast IP Addresses and Multicast accross the subnets I am confused. Configuration: I have two devices in the same network. They may not be in the same Subnet, but always in the same physical network (beyond the same router, switch etc.) I want to communicate across IP multicast either 224.x.x.x or 239.x.x.x may be more fitting because we want it local, not beyond of forward through the router. Can one machine be the receiver and the other machine sender of the same multicast address? and can the receiving machine send an answer to the sending machine?

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  • Windows 7 Homegroups not working?

    - by Jonas
    I've got a homegroup set up, and only the accounts/machines where the user and password is identical can see/share files. I thought the setting to let homegroup control the accounts would make that requirement unnecessary....am I missing something? To be clear: I can see the other machines/user accounts in my homegroup listing, but I can't see any of the files in their shared libraries.

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  • Can't access DD-WRT set in DHCP forwarder

    - by Chris Marisic
    This might sound amazingly stupid but I have a DD-WRT (micro) router that I placed in my network to act as a switch and as a WAP while relying on my cable modem to be the DHCP server. In my attempts to get the configuration right I put the router into DHCP forwarder which then made everything work correctly. The problem is now I can't seem to connect to the router in any fashion to add mac addresses to the WAP access list. Is there something I'm missing or do I need to try a hard reset on it and reconfigure everything?

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  • WiFi: Connect to a network with hidden SSID in Windows 7

    - by Dor
    I have Windows 7 with the following station: D-Link DWA-160 Xtreme N Dual Band USB Adapter(rev.A2) (driver version 3.5.0.21). I'm trying to connect to a wireless network that has an hidden SSID with the command: Netsh wlan connect name="myNetworkProfile" The profile is configured to connect even if the network is not broadcasting its name (SSID). Despite that, the command fails promptly every time with the message: The network specified by profile "myNetworkProfile" is not available to connect. Nonetheless, when trying to connect manually using the dialog box (see image below), it successfully connects to the network after about 10 or 15 seconds. Also, Please - no need to elaborate about how useless the hidden SSID feature is.

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  • Working WCF WebServices with NLB server

    - by gguth
    Im starting the architecture of a new project using WCF, but im not the right person to make some network considerations, so im doing some research but cannot find the answers to these questions: We´ll host the WCF service in a common Windows Service app in 2 servers and we´ll have another server to make the Load-Balancing job using the WNLB. The fact that we are hosting the WCF in a Windows Service app can disturb the NLB job? Before my research i thought the load balancing was tought to configure, but with NLB it seems to be very simple, its really that simple? Note: The binding will be basicHttpBinding

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  • Suggestions for wireless adapter

    - by Michael Kniskern
    I recently purchased a desktop computer and it did not come with a wireless network card. I am currently using the Belkin Wireless G USB Adapter and it is a very sub par product. It has very slow response times and download speeds with just basic browsing and downloads podcasts through iTunes. Does anyone have a better suggestion for a wireless adapter? Should I go with another USB adapter or one that connects directly into the motherboard? I am current using Windows Vista 64 bit Home Premium.

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  • What does this TCP Packet mean ?

    - by asksuperuser
    I'm total newbie at tcp/ip and I was experimenting with Wireshark. What this mean: 1824 578.194204 xxx.xxx.xxx.xxx yyy.yyy.yyy.yyy UDP Source port: 17500 Destination port: 17500 In data I can see that my user pc name is sent (happily it's a generic name): does this mean someone is trying to hack my pc ?

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  • Internet keeps getting Disconnected & Reconnected

    - by Paul
    I have an Internet connection thru a Phone company which uses DSL modem to connect. For past few weeks my net connection keeps getting disconnected for few seconds & it reconnects automatically. I asked the service provider & they checked & even replaced some wires but of no help. Funny thing is that sometimes there seems to be a rhythm where it disconnects for an average of 13 seconds or so plus or minus few seconds, for hours at a time. I don't know how to attach an image to this post where it shows the pattern of connect & disconnect. I have taken an image using snagit to show the timing pattern. If someone can explain it, I can attach it here. Thanks

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  • How to achieve reliable Gigabit Ethernet Link with my Acer Aspire Revo R3610?

    - by The Operator
    I want to stream HD movies over my wired Gigabit LAN from my PC to my Acer Aspire Revo R3610. It's connected with a 3ft Cat5e patch cable to my Netgear GS605v2 Switch. The PC acting as File Server is connected at 1Gbps to the Switch. Network driver options are set to defaults, including automatic speed/duplex negotiation on both machines. The Revo will not connect to my Network Switch at 1Gbps - the OS reports that it reverts to 100Mbps either shortly after connection or immediately upon connection. Through a process of elimination (trying different drivers, patch cables, ports on the switch, and other 1Gbps-capable devices connected to the Network switch which successfully achieve 1Gbps links and performance) I have drawn the conclusion there is either a Hardware or Software (Driver) issue with the Revo itself. I have performed tests using Windows 7 and Ubuntu 9.10. Can anyone offer insight on Gigabit Ethernet with the Revo?

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  • Sendind an internet radio singal from my hifi to a portable

    - by Paul
    I'm just about to set myself up with a wireless network in my house. This is so that I can intregate an internet radio into my hifi system. What I would love to do is to listen to the radio in another room of the house. I also have a little portable radio/cd player that has a USB port on the front. Is there something I could buy which would allow me to listen to the radio through my portable in another room? I do realize that I could solve this problem by buying some wireless portable speakers, however I just wondered if anybody knew another way i.e. bluetooth or something similar?

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  • No Connectivity to ESX guests on one server

    - by Sam Cogan
    I have a number of ESX servers hosting VM's, all but one of these works ok, however one server has a problem where any guests on not contactable over the network. The ESX hosts is contactable, is integrated int VCenter, and you can even live migrate VM's to and from this server, but any VM's on that server are unable to talk to the rest of the network. The VM's NIC is shown as Up and has the right IP configuration, and as soon as you move it back to another host it works fine.

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  • Which ports to open on host firewall so that network printing and scanning works?

    - by George Pligor
    I have a multi-functional machine which is both a laser printer and a scanner (Samsung SC-4705ND) I am not able to make the scanner work with the (software) firewall installed in my computer turned on. Operating system is ubuntu 12.04 with regular firewall. if firewall is turned off then everything works as expected I run nmap to discover open services on the samsung machine and I opened all these ports: 80, 427, 515, 631, 5200, 9100, 10001 but with not luck.. How should I configure firewall?

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  • Virus blocking incoming connections ?

    - by Benoît
    Hello, on my windows 2003 server, all incoming connections are dropped. I can see them getting in using Wireshark, but even a single ping from another computer fails. All locally initiated connection work fine (i'm asking from the server). This server is the DC/DHCP/DNS/File server, so computer clients are in the dark. I've run varius antivirus and removal tools without any luck. The Windows Firewall is disabled. I'm wild-guessing at some virus/worm. How can i check why these incoming ICMP/TCP SYN/etc are dropped ? Anyone has any knowledge about such situations ? Thanks.

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  • triple duplicate acknowledgement in TCP congestion control

    - by Salvador Dali
    If this doesn't belong here, please tell me where is an appropriate place for such question. I am trying to understand ideas behind tcp congestion control mechanisms, and I am failing to understand why we need triple duplicate acknowledgement to trigger window change. In my opinion, double duplicate acknowledgement will be enough to get that the previous package is lost. So why we need the third ack?

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  • Reserve internet connection.

    - by amouniverso
    I have the router D-link 804HV that have 20mbit\s internet via PPoE tunnel . It connect three PC with Windows Xp to my home net. One of three my PC have reserve stability wi-fi internet connection. How can I use the wi-fi connection as reserve if the router connection is not available? I try to set the Wi-fi PC as gate for the other two, but it's not working.

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  • Unable to connect to network

    - by user33750
    Hey guys, I have a question. I have been having problems connecting a new netbook to my network at home. I have an Asus Eeepc 100HAB. I have tried to run a repair on the connection, uninstalled and re-installed the network card, made sure all of the drivers are up-to-date as well. Two caveats: I have a laptop that I recently switched to a wired connection because it wasn't connecting to the network as well, and the netbook connects to an unsecured network i found just fine, only having a problem getting into my home network. Passwords are correct, and the computer where the connection originates from is working fine as well. Any ideas?

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  • D-Link DWA-125 constantly disconnecting in winXP, but works fine on ubuntu..

    - by sil3nt
    Hey there, I'm dual booting winXp and ubuntu 10.10. I'm using a DWA-125 usb adapter to connect to my home wifi connection and I'm having this odd issue. First off, in ubuntu the adapter works fine and I have no trouble at all, but when I boot back in XP I get a dlink connetion wizard and the connection times out after every 2 minutes. It's odd because I can actually load up web pages and use the internet for 2 minutes, and then it would disconnect and the whole thing would repeat. I did a system restore on xp and this stopped the whole connect-disconnect thing but once I booted into ubuntu and came back to xp it started all over again!(?). Any ideas as to how I would go about fixing this?

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  • Pushing WiFi configuration through Active Directory

    - by Hank Gettinger
    I'm trying to push wifi settings to client computers through Active Directory, something that will add a defaul SSID to connect to and a WPA password. The only thing I've heard of is a script by Aruba labs called wificfg_xp.exe on a couple of forums (Here and here), but the link to the download page is always broken. Does any one know of an alternative way to download this file, or another way to push these settings with AD?

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