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• VLAN with trunk to avoid broadcast storm in a network with redundant paths

  - by liv2hak

  I have 6 Juniper switches (EX - 2200) connected to each other as shown in the network topology. I have two PC's that I am using PC1 - (used for configuring the 6 switches via minicom) PC2 - to monitor the traffic between the switches via the Ports that are marked with arrows in the diagram. STEP 1: I create a new vlan On Switch 3 (SW3) that includes Port 12 and Port 22. I also assign l3-interface to the vlan (vlan_2) with ip address - 192.168.1.7. Now I plug-in Port 0 of Switch 3 on PC2. Now I try pinging 192.168.1.7 from PC2 (192.168.1.10) I want to know what will happen? My postulation is that I will not be able to ping SW3 from PC2.This is because SW3 (Port 12 and Port 22) is a part of a vlan_2 and vlan_2 logically breaks up broadcast domains and so 192.168.1.7 will not be reachable from 192.168.1.10. Now I have an l3-interface on SW1 with IP 192.168.1.1 using default vlan( vlan-id 0). Similarly I have enabled IP on SW2 - 192.168.1.2 SW3 - 192.168.1.3 SW4 - 192.168.1.4 SW5 - 192.168.1.5 SW6 - 192.168.1.6 all using default vlan. I create VLAN2 with the following configuration SW3 - Port 12,Port 22. SW6 - Port 14 I create VLAN3 with the following configuration SW3 - Port 0 SW6 - Port 0 I also configure a VLAN trunk between SW3 and SW6 using the following commands. edit interfaces ge-0/0/12 set unit 0 family ethernet-switching port-mode trunk edit interfaces ge-0/0/12 set unit 0 family ethernet-switching vlan members all There is a redundant path in the network as the loop between SW3 and SW6 is closed.There is no broadcast storm in the network? What is the reason for this? I have not enabled STP or RSTP.still there is no broadcast storm.what is the reason for this. (Please ignore the CISCO symbol on the switches in the diagram.All swithes are Junper EX 22-00.)

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• VPN Error 619: Behind Cisco Router WRT310N

  - by ty91011

  I've researched a lot on all the forums and this error is too generic for any of the proposed solutions to work. I'll try to give as much detail and tried solutions. I'm running a CentOS PPTP server behind a Cisco WRT310N Router. Multiple clients from outside with different OS have failed with the same error 619, along with turning off windows firewall and disabling antivirus. I believe this is a router and IP routing issue, and not a client issue. When I connect from a client on the same router as the VPN server, it works when I use the 192. network address- but doesn't work with the public IP address. I've tried telnet to port 1723 from an outside server and I get in. I've opened up the VPN port (1723) on the router, VPN udp port (500), and the GRE port (47) to route to the VPN server's ip. Also, the server's router is behind a DSL modem. I had a glimmer of hope when this site: http://www.chicagotech.net/casestudy/vpnerror619.htm suggested that the PPoE authentication should reside on the router and not the modem. But I still came up empty. So does anybody know what the problem is?

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• Why is my cat5e cable not okay?

  - by torbengb

  My LAN cable seems to work (indicator LED lights up) but the computer can't find a connection. What's wrong? Setup: I had to run a network cable from a router in one room to a computer to another room, through a hole in the wall that was too small to pass the RJ-45 plug through. The plug was cut off and the cable passed through the wall. Then a new plug was crimped on using this detailed explanation. The connection didn't work because the (factory-made!) plug in the other end used a non-standard wire order. I crimped a new plug on again, using the exact same order of the factory-made plug. The LED indicator lights up on both ends, but the computer cannot find a connection. What can be wrong? How can I find out? I don't have a cable tester. By visually inspecting my new plug, I think it's good; the wire order matches the other end, and all wires are all the way inside the plug and reach the connector piece. I've used the cable before (with both factory-made ends) so i don't think that the cable itself has a defect.

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• How To Fix Samba File Permission Issues in Mac OSX

  - by user1867768

  I've had this problem for a long time, here is the basics of it... I use a mixed environment of Windows 7/8 computers with Mac OSX Lion/Mountain Lion. Whenever a Windows computer creates a file on a SMB share on the Mac it no longer has group permissions, only the person who created or updated it can access it. My solution has been to go onto the Mac system and reset permissions for the entire directory structure then everyone can see it again. About the only thing on this that I can find was for OSX pre Snow Leopard that mentioned editing the SMB.CONF file to fix their particular problem (similar to mine, http://www.gladsheim.com/blog/2009/09/19/osx-leopard-and-samba-permissions/). The problem is that now Lion and Mountion Lion no longer have an SMB.CONF file (another web search pointed to the com.apple.smbd.plist (http://kidsreturn.org/?s=smb.conf) but it's an XML file now and I'm not clear on what should be done to THAT to fix the problem. So, short of me writing an Applescript to run every hour to fix permissions, does anyone know a solution to this very frustrating problem? Thank you in advance for any advice or solutions you can offer!

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• USB Wifi will not connect on Windows 7 (Even though the driver installs OK)

  - by Pete Roberts

  Windows 7 will not connect to a WiFi Netowrk using a USB Network Adapter. I have 3 adapters, A Senoa SUB 364 (EXT), a Repeatit SU2410 USB V2 and a ZYXEL G202. All of these devices install OK on Windows 7 Home Premium on my Destop PC (64 bit) and on my Asus Wii Netbook (32 bit). In each case the adapter can be enabled/disabled and the driver properties says it is working correctly. When I try and connect to a network Windows 7 behaves as though the adapter does not exist and reports no networks. The Wii has an integrated adapter which works perfectly under Windows and connects to either of the 3 networks available to me. I have done all the checks I can on the configuration. What seems odd to me is that it happens to all 3 devices on 2 different windows 7 PCs both of which are working perfectly in any other respect. This suggests the common denominator is me and I must be doing something wrong.. what's also strange is that I cannot find any similar problems being reported on any of the forums. From what reading I've been able to do it seems like the new wifi virtualisation thingy in W7 is not recognising the adapters which suggests I', missing a configuration option somewhere. Looking forward to finding out if I'm not alone or just being stupid. Pete

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• How to scan local network (LAN) for connected devices (Mac OS)

  - by smotchkkiss

  I'm basically looking for something like this but available on Mac. I am trying to connect a new workstation to our wireless multifunction printer and I'm having a hell of a time getting the device to spit out an IP for me to connect to. Is there a way I can scan the network somehow? If it makes a difference, the new workstation is using Mac OS X 10.6 Thanks in advance :)

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• Embedded Net DVR camera1 failed to start preview!

  - by user44212

  I am gettig the following error as "Embedded Net DVR camera1 failed to start preview!" when we are trying to login and view the preview of the cameras on the DVR 8116HCI-S Standalone. There is an IP Address assigned to the same via which we access the same. I checked the site for information here http://www.hikvision.com/en/Products_show.asp?id=32. But could not find any useful information relating to the error message. We can access the same via login in from one machine but we are not able to access it from more than one machine.

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• Windows XP IIS5 performance across Network

  - by davidsleeps

  Hi, Just wondering whether Windows XP with IIS5 running needs any extra configuration to be suitable as a web server...I'm not considering using this for anything other than a web server on a small network for testing development etc One of the reasons I'm concerned though is that we've deployed an asp.net application to a workstation with Windows XP, and running the application using a browser on the machine (so accessing it through localhost/myApp/page.aspx and not accessing it through the network) runs the application really quickly. If another machine on the LAN accesses the same page (using http://ComputerName/myApp/page.apx) then the whole application runs noticeably slower...yet the computers are connected on a gigabit switch...so I wouldn't have thought network latency or bandwidth could be an issue... Does Windows XP need anything etc enabled or changed or network settings for it to work correctly?

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• How to configure a Router (TL-WR1043ND) to work in WDS mode?

  - by LanceBaynes

  I have a WRT160NL router (192.168.1.0/24 - OpenWrt 10.04) as AP. It's: - WAN port: connected to the ISP - WLAN: working as an AP, using 64 bit WEP/SSID: "MYWORKINGSSID", channel 5, using password: "MYPASSWORDHERE" - It's IP Address is: 192.168.1.1 Ok! It's working great! But: I have a TL-WR1043ND router that I want to configure as a "WDS". (My purpose is to extend the wireless range of the original WRT160NL.) Here is how I configure the TL-WR1043ND: 1) I enable WDS bridging. 2) In the "Survey" I select my already working network. 3) I set up the encryption (exact same like the already working one) 4) I choose channel 5 5) I type the SSID 6) I disable the DHCP server on it. After I reboot the router and connect to this router (TL-WR1043ND) over wireless I'm trying to ping google.com. From the ping I see that I can reach this router, that's ok, but it seems like that this router can't connect to the original one, the WRT160NL (so I don't get ping reply from Google). The encryption settings/password is good I checked it many-many-many times. what could be the problem? I'm thinking it could be a routing problem, but what should I add to the "Static Routing" menu? I tried to change the IP address of the TL-WR1043ND to: 192.168.1.2 So if this a routing issue then I should add a static routing rule that says: If destination: any then forward the packet to 192.168.1.1 p.s.: I updated the Firmware to the latest version. It's still the same. p.s.2: The HW version of the TL-WR1043ND is 1.8 p.s.3: Could that be the problem that I use different routers? (If I would buy.. another TL-WR1043ND and use it instead of the WRT160NL, and with normal Firmware, not OpenWrt, then it would work?? The "WDS" is different on different routers?) p.s.4: I will try to check the router logs@night - and paste it here! :\

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• TP-LINK TD-W8151N Modem/router as just wi-fi router

  - by Reshma

  I am planning to buy TP-LINK ADSL wifi router (model TD-W8151N) for my Internet connection which provides Internet through ADSL telephone line. I am also planning to take cable internet in a few months which provides internet through a LAN cable without the need of any modem. So I would like to have my modem work for both connections which I am using. When using cable internet I want this TP-Link modem to work just as a wireless router (so that I can have the freedom to use my laptop in different rooms instead of sitting at a place by plugging in that cable). Is it possible to use this modem in that way? I don't have much knowledge about these things except that I can configure things as instructed. Please suggest me whether I should go ahead and buy this one or if there is any other modem in your view which can serve both my purposes, let me know. Operating System I am using: Windows 7

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• Logging network activity of LAMP server using BASH

  - by Yarin

  I've got a Fedora LAMP server on Amazon EC2 functioning as a HTTP pseudo-proxy (Sorry, don't know the terminology- It's not a true proxy where requests are relayed through apache, rather client requests are being translated by a PHP script, which then sends a new request.) I'd like to be able to fully log the HTTP cycle CLIENT - PROXY PROXY - SERVICE SERVICE - PROXY PROXY - CLIENT I'm hoping to do this using BASH tools- thinking netcat? Looking for advice and examples. Thanks!

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• What's the difference between a wifi access point and station?

  - by Earlz

  I noticed that my (rooted) modem has some hidden modes for wifi. It has the default(and only setting without rooting) wireless access point, but it also has the settings repeater, ad-hoc, and station. What I'm really curious about is this station mode and how it differs from access point. I did a cursory search and didn't come up with any significant differences, other than that they are two distinct modes on many wireless chipsets. What is this station mode and how does it differ from access point?

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• setup Mac Book Wifi interface as Wifi hotspot using specific DHCP option

  - by srjohnhuang

  I want to using my Mac Book as an access point. Besides that I also need to configure its DHCP server to not provide DNS info. For example, Mac Books AP's ssid is "MacBookHotspot". While my iPhone connected to "MacBookHotspot", I want the Wifi info displayed my iPhone would be looked like: IP ADDRESS DHCP(tab) IP Address 192.168.0.1 Subnet Mask 255.255.255.0 Router 192.168.0.254 DNS Search Domains Client ID (key point: DNS filed is blank) Does anyone have any good suggestion? Thanks!

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• Browsing Playstation 3 from Ubuntu Box

  - by zfranciscus

  Hi, My Goal here is to be able to transfer files from my Ubuntu 10.04 box to my PS3 over a wireless network. My PS3 and my Ubuntu Box is on the same home network. These are some stuff that I tried: I can't see my PS 3 from 'Places ? Network' nor other computer that is running on windows. I am still puzzled by this fact. I have not tried ping-ing my PS3. I'll try that later today and post the result in the forum I install PS3MediaServer (http://code.google.com/p/ps3mediaserver/). Someone in the PS3 chat forum (http://www.ps3chat.com/playstation-3...lp-please.html) claims that it will enable your ubuntu box to browse PS3. So I downloaded PS3MediaServer, and ran the software. The status tab keep showing "Waiting ...". It seems that PS3MediaServer can't find my PS3. Some how I feel that 1 and 2 are related somehow.Perhaps that there is something wrong with my Ubuntu network settings that is preventing my ubuntu box from looking up other device on the network. I can go to the Internet fine, but I can't see other device on my network. Does anyone have any experience in this area. I would like to hear your experience and perhaps some solution. Any kind of hints or help will be greatly appreciated. Cheers

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• Why can I not access the internet when Windows 7 finds no issue with the ethernet connection and the network can see my device?

  - by WannabeCoder

  So I just moved from a house to an apartment. In the house and the apartment I had Uverse set up - and in both I had my desktop connected via a ~40 foot long cat5 cable. However, upon moving to the apartment I found that my ethernet connection no longer provides internet. This would seem like a mundane problem if not for: The router can see the computer on the network Windows 7 (the desktop's OS) detects no problems with the ethernet connection. Connections over the internet (i.e. browser windows, Pandora, etc.) do not immediately fail. Instead they load for 2 minutes and then finally give up. Devices connected over the Wifi (PS4, Laptop) access the internet just fine While removing the cat5 cable from my house, I accidentally damaged the locking tab but managed to bend it back into the appropriate position. I would suspect that a bad cat5 cable might be to blame if not for the above issues (thought I've heard bad cat5 cables cause the most nonsensical problems) and the fact that I tested the cat5 cable by having it share internet between my laptop (working internet) to my desktop and it functioned just fine and provided the desktop with internet. My ipconfig /all successfully finds a default gateway, DHCP server, and DNS server. What could possibly be causing the problem?

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• Cisco ASA: Routing packets based on where the connections started from

  - by DrStalker

  We have a Cisco ASA 5505 (version 8.2(2)) with three interfaces: outside: IP address 11.11.11.11, this is the default route inside: IP address 10.1.1.1, this is the local subnet newlink: 22.22.22.22, this is a new internet connection. We need to move VPN users from the 11.11.11.11 address to the 22.22.22.22 address, and we're using SSH on the ASA as to test and sort out the routing. The problem we have is this: If we define a particular IP as being on a static route out the newlink interface then it can SSH to 22.22.22.22 fine. If we do not define a static route then the traffic hits the ASA, but the return traffic does not come back over newlink; presumably it gets sent over the outside interfcae as that is the default route. We can't define a static route for each remote endpoint because there are dialup VPN users, who obviously change IP a lot What we need to do is configure the ASA so if a connection comes in on the newlink interface then the outgoing packets for that go over the newlink interface, not the default route. With iptables this should be do-able by marking the connection and doing mark-routing, but what is the equivalent for a Cisco ASA?

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• Intermittent "Lost connection to MySQL server at 'reading initial communication packet'"

  - by db2

  Our web environment consists of two servers. Web front-end. Dell PowerEdge R610, RHEL 5.5, Apache 2.2.17, php 5.2.14. Database server. Dell PowerEdge R710, Windows 2008 R2 Standard x64, MySQL 5.5.11-log x64. Normally these two work perfectly fine together. However, when I try to get them talking via a dedicated LAN on their secondary NICs (each machine has four of them), things get flaky. I have NIC #2 on both machines configured on the 172.16.1.0/24 subnet, with no gateway or DNS servers (obviously, since it's just those two systems), and I put the private IP address of each machine into the hosts file of the other. The routing tables on both machines look okay after I do this. I've tried this with both a crossover cable draped directly between the two NICs, and also via a dedicated vlan on the switch in the rack. In either case, I get intermittent connection problems. It's a fairly small percentage of connections that fail, but it's enough to cause a significant problem, and I have to switch back to the main network connection, which will contend with all the other traffic and hosts on the switch. The full error message that appears in the application log: SQLSTATE[HY000] [2013] Lost connection to MySQL server at 'reading initial communication packet', system error: 110 Am I doing something really dumb that's causing this to not work properly? Anything I can check in MySQL that would explain why it's failing to connect occasionally?

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• Using an audio cable (or similar) to create unidirectional communication from a secure server

  - by makerofthings7

  I'm interested in exploring how a semi-offline Root CA can be used to update CRLs to the sub CA's. This answer on Security.SE mentions using an audio cable for this purpose. Doe anyone have details on how an Audio cable (or similar) can be used to create a unidirectional path of communication? Since I'm a .Net programmer, I'm also open to code samples, drivers, etc that may enable this scenario.

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• Windows XP does not list WPA wireless networks

  - by Tomalak

  What can be the reason that Windows XP does not show WPA-encrypted wireless networks? The laptop I have problems with is an older model (Toshiba Satellite Pro 6100) with Windows XP SP3 on it, fresh install. The wireless network card in it is an Agere product that lists as "Toshiba Wireless LAN Mini PCI Card". The networks showed up perfectly before I first tried to connect to one (it was set to WPA2). The connection failed (the card supports WPA only), then something must have happend and Windows hides these networks now. A manually configured WPA setup via Windows' own wizard works, I'm using it right now. The network just won't show up in the list of available network on its own. I suspect that XP incorrectly set a flag somewhere that this network card does not support WPA. Is there such a flag, and if so, how can I change it back?

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• How do I see what connections are being made?

  - by Coldblackice

  My DDWRT router is showing that my computer has a connection count around 600! The router is at 100% CPU use. How can I see what's making all the connections? So far, I've opened up Resource Monitor and checked the network tab. I can sort by which program is using the most network bandwidth (Pale Moon browser), but I can't see what's making all of the connections. Or rather, where all the connections are being toward (trying to find what tab must be making all of these connections). I've also tried netstat -A, but it apparently doesn't show the actual number of connections being made. At least, the list of established connections isn't very long, by any means (like enough to account for the 500+ connections apparently being made.

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• Linksys SRW248g4p and hp procurves

  - by Garfield81

  We've got about 3 procurves linked up with about 5 linksys srw248g4p. Pinging between the Procurves I get ping time between 1-2 ms and pinging between the linksys the ping time are averaging 40 ms. I have evening tried pinging between two linksys switches that are connected to each other directly using the GB ports. There have no modification done to the switches and the firmware seems to be uptodate. Any suggestions would be appreciated.

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• "entering link in browser" to "finding route to host" how it works?

  - by Algorist

  Hi, Is there a wiki or book, which explains what happens when user enters a link in the browser, and how the dns is resolved, how the router finds the route to the host etc.. I am mainly interested in routing the packets. Thank you

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• Linksys WRT54G2 not showing connected PC's in DHCP table

  - by Moose

  For some reason all of a sudden my linksys WRT54G2 no longer shows PC's connected in the DHCP table. It was being touchy then all of a sudden they all just disappeared. It showed 2 of the 4 connected then it showed the other 2 then it only showed 1 and then it was showing none. I seem to be having a connection reset every 30-60 minutes also not sure if that is related to the router going bad or if it is just comcast being it's typical crappy self. I have tried to reset my router and my cable modem and both problems still seem to keep happening(no PC's in table and connection reset every 30-60 mins). Now I know the router doesn't store clients after a router reboot but they normally show up within a matter of minutes for me in the past. Before anyone asks yes all devices on the network are using DHCP and not static. Could this be a sign of the router starting to go bad?

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• How to backup a networked drive?

  - by nute

  I have a networked drive (Iomega Media Drive). To be safe in case the drives crashes, I've decided to buy an additional networked drive (WD MyBook World). Now, how do I backup one onto the other continuously? The WD drive came with a backup software (trial version, they didn't say that when i bought it), however it doesn't allow me to select a networked drive, only local drives. How do I backup a NETWORKED DRIVE ONTO A NETWORKED DRIVE? Thanks

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• No communication on my VLAN?

  - by Donovan

  I am using a Netgear FSM7328S switch and have designated ports 19-24 as being part of VLAN # 3. I designated them all as untagged because I do not want them to switch traffic to any other port on the switch. I also removed them from the default, untagged, VLAN 1. My issue is that none of the ports 19-24 will communicate with eachother. My laptop plugged in with wireshark shows no switched traffic what so ever. Have I configured it wrong? Thanks, D

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