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• How to troubleshoot slow powerconnect 62xx management interface

  - by Hannes

  Our Dell Powerconnect 62xx switches have a very high packetloss on the management interface. I presume this is caused by a new appliance which uses multicast for communication but I am not sure. Our network setup is following: servers a - Dell PC6248 | servers b - Dell PC6248 |- juniper core router servers c - Dell PC6248 | What we see is that the multicast traffic arrives at all servers (but only the servers b use the multicast) and I fear that this multicast traffic floods the switch management interface. The switches' management interfaces are reachable via vlan101, all other traffic is sent over other vlans. When I tcpdump on one of the 2 servers with a vlan 101 ip address, I only get a few arp requests but almost nothing. When I try to ping between these 2 servers, it works like a charm. I would like to know what a good way is to troubleshoot this problem and maybe help me understand what is going wrong on that subnet.

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• Need to know who is hogging my bandwidth?

  - by Dev

  I have an ethernet connection to my iMac and with Internet sharing I am broadcasting the wireless network from my mac rather than using a wireless router. I use it to connect other devices wirelessly to the internet. But this makes all the traffic flow through my iMac. I wanted a way to analyze the traffic so that I know what connected devices are hogging the bandwidth at a given time and from which websites? I installed wireshark for mac and played around a little but it seems like an overkill when you first look at it. Can someone please help with few instructions to get what I need or any other way other than using wireshark? Thanks Dev.

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• SQUID Transparent SSL proxy (no intercept)

  - by user974896

  I know how to have squid work as a transparent proxy. You put it into transparent mode then use your router or IPTABLES to forward port 80 to the squid port. I would like to do the same for SSL. Every guide I see mentions setting up keys on the squid server. I do not want squid to actually decrypt the SSL traffic then establish a connection with the server, rather I would like squid to simply forward the SSL traffic as is. The only thing I would like to do is be able to check the SSL request for any offending IPs and drop the packets if the destination is one of them.

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• VPN service for 4in6

  - by Deshene

  I have a local network with internet access. But unfortunately IPv4 internet connection speed is limited to 1mbps, which is realy sad. Fortunately I have a native IPv6, and there is no connection speed limit over IPv6. So, in order to get a good internet connection I made a plan: connect to the VPN-service over IPv6, and pass all IPv4 traffic through IPv6 tunnel, or something like that, I think you get the idea. I suggested to use service like HideMyAss.com, but unfortunately they don't support IPv6. The question is: Is there any existing VPN service that will make my dreams come true, and is easy to use, which I could connect over PPTP or OpenVPN (I want to set up connection to VPN in my router settings).

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• How to analyze a wifi network with many devices

  - by Caveatrob

  My friend has a wifi network with an x-box, a wii, a playstation, and two nintendo portables. She's also got 2-3 PC's and a network printer. She's got a wifi repeater as well. She claims that she didn't have any issues for months with everything working together, and suddenly everything stopped disconnecting. I haven't been over there yet - wanted to figure out the best way to diagnose the thing. I asked her to send me the stats on the booster and the modem, etc: The booster is Netgear serial #2ac2195506b95 The modem is Cisco Linksys e1500 #10910c12129103 We have a sprint router thru centurylink and they said it is working fine 660 series

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• Connecting office to data center via Metro-ethernet

  - by Eric

  I am installing a metro ethernet link from my office to my data center. The office will have a cisco 3750 with several vlans. The data center end will have a more complicated set up. The metro e from the office will connect to a 2960, which will have two other 2960s with a few vlans and a 2811 router connected to it for connectivity to our other environments and the internet. I am looking at implementing this by connecting the office 3750 and the data center 2960 with a dot1q trunk and doing all routing at the 2811. I will configure subinterfaces for gateways for each of the vlans on the 2811. I work for a small company and don't have much of a budget for an ideal architecture. I can post a simple diagram if needed for clarification. Is there anything I am missing here? I feel like I am forgetting something very basic and want to make sure I eliminate any boneheaded mistakes.

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• Is it possible to use Linux to route between my office (which uses IPSec) and home network?

  - by Sam

  First of all, apologies if this seems vague - I'm not an admin of anything more than a home network. I have a Ubuntu box sitting on my network which does various odd tasks for me - svn serving, some file serving, Apache/MySQL/PHP which is all raring to go. I've started a new job and at the moment I'm using ShrewSoft VPN software to establish a VPN link to the office as I need it. I'd prefer to have something always running on my home network just for convenience. My home modem/router doesn't support holding a VPN connection open. What I would like to do is set up my Linux box to hold open a VPN connection to my office and keep it open permanently, and then all applicable traffic for the office be routed through this box. I'm not sure if this is possible, or how to configure the routing on the desktop PCs (Windows 7). Would appreciate any guides, etc that could help me out.

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• Vista to Vista network visability issue

  - by Sk93

  Hi All, I've got a Vista Business PC and a Vista Business Laptop connected via a virgin media router (Netgear CG2100D) and I cannot get the two machines to see each other correctly over the network. The laptop is connected via wireless, whilst the pc is wired. Both are set to recieve their network settings automatically (DHCP) and both have the windows firewall (the only firewall on either) turned off completely. I can ping each machine fine from one another using the ip addresses, and I can also connect via \. However, connections via \ fail, and I cannot see the machines in the network map. I have tried turning netBIOS to be "always on" on both adapters, but this makes no difference. I've been messing around pretty much for 6 hours now and am getting quite fustrated by this! (my original aim was to get media sharing working, but I've pretty much abandoned that for now). Any ideas?

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• Windows 7 - Wireless connection before login possible?

  - by EJ

  Is there a way for Windows 7 to connect to a wireless network before a user has logged in? I have found no good answers to this question elsewhere. Some say it should already be happening if I am using Windows' connection management (WLAN AutoConnect, formerly WirelessZero), but I am using that, and it is not. I can sit at the login screen for as long as you please and it will not connect (watching the router from a separate PC), moments after I login it will connect. Others have said that you need to use the manufacturer's connection management (not Windows'), and they can sometimes have the option for prelogin/prelogon connections, but I am using generic drivers. The device is a Netgear/Cisco WMP300N, with a Broadcom chipset. Netgear/Cisco and Broadcom all claim to not have drivers for Win7, but Win7 apparently comes with a functional driver.

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• Superscope DHCP leases and configuration set up

  - by Vdub

  Hello I wanted to see if someone could help with a network problem I am having. Right now we have a super-scope and scopes of 192.168.50.1 and 192.168.51.1, as of now both are activated but only 192.168.50.1 is handing our leases, 192.168.51 wont. here is a summary of our network Gateway: watchguard firebox x750e for our router/gateway at 192.168.50.1 I set up as a secondary IP address 192.168.51.1 Server: Server 2008 r2 standard, running our DNS @ 192.168.50.242 and 8.8.8.8 as a secondary, AD, and DHCP. On that NIC card i have 192.168.50.242 as the IP address and 192.168.51.242 as a secondary. 192.168.50.1 as the default gateway and 192.168.51.1 as a secondary. Im am not very knowledgeable at this but as far as i have researched after adding a super scope and activating scopes, they should automatically start handing out addresses and I cant figure out why only one does. any help at all would be appreciated.

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• wifi connection turns off oll the time

  - by er-v

  Hello! I realy need help with one strange problem. I have a wifi network in my appartment with wireless N home router Trendnet tew-652BRP. Everething work fine for three of my laptops, but I have one PC with D-Link DWA-140 adapter. It looses connection 2-3 times in 5 minutes. There is following messages in my system log when it does so: The browser has forced an election on network \Device\NetBT_Tcpip_{9537A5C1-3B43-4C56-B94C-CE69A257C3AD} because a master browser was stopped. The TCP/IP NetBIOS Helper service was successfully sent a stop control. The reason specified was: 0x40030011 [Operating System: Network Connectivity (Planned)] Comment: None The TCP/IP NetBIOS Helper service entered the stopped state. in order of appearence. How can I stop it? I have the latest driver installed.

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• ftp server over internet using different port

  - by ???? ????

  I want to make my ftp server over the internet i made it on Debian linux computer and i changed the port of it to 201 my local ip is 192.168.1.3 so i can access it from any computer on my network through ftp :// mylocalip:201 it appear to me the login page i login with my linux user and can see the files on my ftp server to make it public i make port mapping on my router for port 201 when i try ftp :// mypublicip:201 it give me the login page and when i entered the login data it is loading infinity without open my ftp server files when i made it over default port 21 it works fine. can any one tell me what is the problem here?

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• Can I ping via an arbitrary interface of a DD-WRT system? [migrated]

  - by bytebuster

  There's a Linksys WRT54GL router with DD-WRT firmware (v23SP2). The network has a simple dual-WAN configuration (standby mode, switching by a script): ~ # ip route 192.168.3.0/24 dev br0 proto kernel scope link src 192.168.3.1 192.168.2.0/24 dev vlan2 proto kernel scope link src 192.168.2.2 192.168.1.0/24 dev vlan1 proto kernel scope link src 192.168.1.67 127.0.0.0/8 dev lo scope link default via 192.168.2.1 dev vlan2 I'm trying to ping a certain server arbitrary via vlan1 or vlan2. What I tried, as suggested here: ping -I vlan2 <address> ping 192.168.2.1 <address> In both cases ping simply exits with no error messages. Also, ping ignores many other parameters, again, by exiting silently. I failed to find any references that DD-WRT has a limited version of ping whatsoever. I also don't think it can be a permissions issue as mentioned here since the only user with DD-WRT is root. What's wrong?

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• Automatically reboot Windows8 if no internet activity [migrated]

  - by Patrick

  I have a media server located in a very inconvenient part of my house. Occasionally I will have to reset my router or it will reset itself. The issue is the PC loses connectivity for some reason, and I am forced to walk outside, around the house, into the basement, over a bunch of toys and weights and boxes, to push a button to reboot it. I would love to have it check itself every 5-10 minutes and auto reboot if it is unable to ping a given address/IP. Any ideas how to accomplish this?

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• Understanding connection tracking in iptables

  - by Matt

  I'm after some clarification of the state/connection tracking in iptables. What is the difference between these rules? iptables -A FORWARD -m state --state ESTABLISHED,RELATED -j ACCEPT iptables -A FORWARD -m conntrack --ctstate ESTABLISHED,RELATED -j ACCEPT Is connection tracking turned on when a packet is first matched containing -m state --state BLA , or is connection tracking always on? Can/Should connection state be used for fast matching like below? e.g. suppose this is some sort of router/firewall (no nat). # Default DROP policy iptables -P INPUT DROP iptables -P OUTPUT DROP iptables -P FORWARD DROP # Drop invalid iptables -A FORWARD -m state --state INVALID -j DROP # Accept established,related connections iptables -A FORWARD -m state --state ESTABLISHED,RELATED -j ACCEPT # Allow ssh through, track connection iptables -A FORWARD -p tcp --syn --dport 22 -m state --state NEW -j ACCEPT

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• I can't get my Macbook Pro to print to an IP addressable printer

  - by Pieter

  Running Macbook Pro OS X 10.6.3 Accessing an HP OfficeJet 5610 plugged in the USB port of a US Robotics router. I tried several combinations of: Protocol: Internet Printing Protocol (IPP) Line Printer Daemon (LPD) HP JetDirect (socket) Address: http://192.168.1.10:1631/printers/HP5610 192.168.1.10:1631/printers/HP5610 http://192.168.1.10:1631 192.168.1.10:1631 192.168.1.10 ... Driver: HP OfficeJet 5600 Series Whenever I try to print, it fails while saying "connected to printer" or "Printer is busy...zill try again in X seconds" Both Windows 7 and Windows XP computers on the network can successfully access this printer, identifying it as "HP5610 on http://192.168.1.10:1631/" I tried clearing all tasks and printers (ctrl-click in the menu), and resetting it to (socket, http://192.168.1.10:1631/printers/HP5610, HP5600 series) but to no success.

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• Inaccurate bandwidth limiting in altq queues

  - by overkordbaever

  I'm setting up an environment where I have one Linux server, one OpenBSD router and one Linux client and I want to be able to limit how much bandwidth the client should be able to use. I've been performing these tests with "netcat" and "time" (using time to measure the time of the transfer with netcat), and what happens when trying these tests (using the TCP protocol, the queues will for some reason not work with UDP) is that the queues aren't exact at all. For example: when setting a bandwidth limit of 10mbit, the client cannot use more than five mbits, when setting a limit of 100mbit, the client cannot use more than around 50mbit. The config looks like (using a 100mbit limit in the example): #queue rules altq on { $int_if, $ext_if } cbq bandwidth 100Mb queue { def, low } queue def bandwidth 0Mb cbq(default) queue low bandwidth 100Mb cbq(default) #Passrules test pass out quick from $int_if to $ext_if queue low pass in quick from $ext_if to $int_if queue low pass out quick from $ext_if to $int_if queue low pass in quick from $int_if to $ext_if queue low

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• two identical broadband lines working as one

  - by Katafalkas

  I have been trying to find an answer to this, but all I get is hobbyists trying to connect they linksys's and get some magic out of it. So I am thinking of a way I could combine two 100Mbp Fiber Optics lines into a single connection for our office. I assume it involves some CISCO learning or something like this. Was thinking that I might need to configure some big router to load-balance the NAT'ing in some way. I assume that meny of you have done something similar and maybe someone could share the knowledge or at least provide some tips ?

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• Google and Gmail only work on one laptop and not the other two

  - by Becca

  We have Comcast internet and everything was fine until recently. I am currently using my father-in-law's PC, and Gmail, Paypal, and Google all work fine. They don't work on my laptop or my husband's. We've reset the router/modem several times and nothing works. So we unplugged the main line outside and it fixed it for two weeks but now it's back to being stupid again. We've tried everything else and nothing seems to work. Any ideas?

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• Cisco access list logging. Why is there a difference between IPv4 and IPv6?

  - by growse

  I've got a Cisco 877 router. I've got an IPv4 access list and an IPv6 access list set up and configured similar to this: interface Dialer1 ... ip access-group INTERET-IN ipv6 traffic-filter IPV6-IN Each of these access lists has a final rule of deny ip/ipv6 any any log. However, in my syslog I notice that there's a difference in formatting between the two types of entries. IPv4 will say: %SEC-6-IPACCESSLOGP: list INTERNET-IN denied udp 88.89.209.63(137) -> 1.2.3.4(137), 1 packet Whereas the IPv6 list will say %IPV6_ACL-6-ACCESSLOGNP: list IPV6-IN/240 denied 59 2001:0:5EF5:79FD:14F9:B773:3EBA:3EE3 (Dialer1) -> 2001:800:1000:0::1, 8 packets Both have broadly the same information, but the IPv6 log entry is missing the protocol type and port, both of which are very useful if I'm trying to troubleshoot connectivity. Why is this? How do I get IPv6 deny logs to display the protocol and port used, if any?

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• Connection reseted- error 101

  - by Maja

  I have a problem with internet connection- when i try to load website, it will always write this error:Error 101 (net::ERR_CONNECTION_RESET): Connection was reseted. I'm using Win7 64 bit and I have this router: asus rt n10. First, i tried to change MTU from 1504 to 1472 and it worked for a while, but yesterday it started again. Now I have MTU 1440 but I don't want to lower it more. Is there another solution? Btw I have no malware in my laptop (I used the avast scan) and I've also deleted cookies and disabled proxy server (I'm not using any).

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• NAT for static private addresses

  - by biggdman

  Could someone please help me out with the following scenario: I have a machine that hosts 3 lxc containers, and acts like a router for them. The LXC containers have private ip addresses set on the interfaces that are connected to the host. I want to provide Internet access to the containers and I want to configure the host system so it translates only the addresses that are configured static on the lxc containers interfaces. Should I try to configure the host so it translates each of the 3 private addresses to the public address of the host's interface that is connected to the Internet?

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• Separating my VPN connection from my internet access

  - by Christi

  Background: Home PC is Windows XP and using Cisco VPN client; home internet connection is fast (20MB) office VPN router is Cisco RV110W; work internet connection is slow (1.5MB) With VPN connected, my home PC internet surfing is very slow. I looked this up in Google and found talk about splitting, tunneling, routing tables, etc., but I'm not sure what/how to do it. Basically, I would like a persistent VPN connection with the office resources, and at the same time, utilize my home high speed internet connection to access the internet. Can someone help me the steps as how-to?

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• Using a Dell PowerConnect to set up load balancing/redundancy, 1 switch 2 routres 2 private wan link

  - by MarianoC

  Hi, We have different locations connected by two different WAN providers. Each site has a dell powerConnect 6224 and two cisco routers with the WAN connections (we don’t have access to router admin). The 6224 connects to each cisco LAN port and to our LAN backbone. We would like the 6224 provide the ip gateway address and load balance and support redundancy, if one of the routes fail. Is this possible?. We can't find any samples on doing this and we have tried with no success. Any help or link to documentation regarding this, will be greatly appreciated. Thanks, MarianoC

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• Remote connection to dynamic public ip & private ip addresses

  - by user51737

  Many times I connected to windows computer which has static public ip address via remote desktop over wan links. I'm wondering how could I connect to the remote computer that has dynamic public ip address & private ip addresses assigned. I've 2 systems at home: xp system-------connected to internet(dynamic public ip) & allowed other users to connected to the internet on the interface. windows vista system--------enabled dhcp on the interface to access internet from xp. How could I remotely connect from my office to the 'vista system'?. If I've a router/modem at my home it may be possible to allow the ports for the system but I don't. Any tips?

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