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• Cant get squid proxy to work

  - by danielgratz

  i need squid proxy on my centos server. But i just can't get it to work. I did yum install squid. Here is my squid.conf file (i removed all comments): acl all src 0.0.0.0/0.0.0.0 acl manager proto cache_object acl localhost src 127.0.0.1/255.255.255.255 acl to_localhost dst 127.0.0.0/8 acl SSL_ports port 443 acl Safe_ports port 80 acl Safe_ports port 21 acl Safe_ports port 443 acl Safe_ports port 70 acl Safe_ports port 210 acl Safe_ports port 1025-65535 acl Safe_ports port 280 acl Safe_ports port 488 acl Safe_ports port 591 acl Safe_ports port 777 acl CONNECT method CONNECT acl our_networks src 192.168.1.0/24 192.168.2.0/24 http_access allow our_networks http_access allow manager localhost http_access deny manager http_access deny !Safe_ports http_access deny CONNECT !SSL_ports http_access allow localhost http_access deny all icp_access allow all http_port 3128 hierarchy_stoplist cgi-bin ? access_log /var/log/squid/access.log squid acl QUERY urlpath_regex cgi-bin \? cache deny QUERY refresh_pattern ^ftp: 1440 20% 10080 refresh_pattern ^gopher: 1440 0% 1440 refresh_pattern . 0 20% 4320 acl apache rep_header Server ^Apache broken_vary_encoding allow apache coredump_dir /var/spool/squid Then i just put my server's public ip and port 3128 into my web browsers proxy settings... but it isn't working i can't visit any website. Please help. Thanks.

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• Creating ip alias on bonded interface ie. bond0:1

  - by bobothechimp

  System: HP Proliant DL360 G5 running CentOS 5.4 Bonded interface is working fine for a long time. I just went to add an alias the way I always have on a regular interface, and on first check it works (pinging on the local box) but it is not accessable from outside (iptables is turned off). In addition with this setup the normal network response started to decline, hanging for around a minute before I could get a prompt on login. Here are my config files: [root network-scripts]# cat ifcfg-eth0 DEVICE=eth0 BOOTPROTO=none ONBOOT=yes MASTER=bond0 SLAVE=yes USERCTL=no [root network-scripts]# cat ifcfg-eth1 DEVICE=eth1 BOOTPROTO=none ONBOOT=yes MASTER=bond0 SLAVE=yes USERCTL=no [root network-scripts]# cat ifcfg-bond0 DEVICE=bond0 BONDING_OPTS="mode=1 miimon=100" BOOTPROTO=none ONBOOT=yes NETWORK=10.2.1.0 NETMASK=255.255.255.0 IPADDR=10.2.1.11 USERCTL=no [root network-scripts]# cat ifcfg-bond0:1 DEVICE=bond0:1 BOOTPROTO=static ONBOOT=yes NETWORK=10.2.1.0 NETMASK=255.255.255.0 IPADDR=10.2.1.12 USERCTL=no any thoughts?

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• Wireless slow, but very odd

  - by Logman

  I have a HP Pavilion dv6 laptop, internet through the wireless timeouts. Even though it connects fine to the AP/router. The computer had a virus (searchnu?) and I backed up the usual and restored the laptop to factory image. Problem is after the restore the internet through the wireless the same still... and connected via wired and everything worked fine. I was able to update the whole system. Internet worked perfect, speed great. But the wireless still was pitiful. Ping tests with wireless are interesting: Google= 18ms Gmail= 18ms Yahoo= 1023ms 8.8.8.8=30ms Microsoft= Request Timed Out Bing= Request Timed Out msn= Request Timed Out even though I get 18ms with google, the pages take a long time to load. Is this a root kit? is it the wireless card in the laptop?

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• How do you use Time Capsule for MAC controlled Internet?

  - by Kevin Perttula

  I'm using an Internet Provider that requires a username and password to log in; the prompt shows up as soon as you open a web browser. Because of this, I can only have one device online at a time. How can I get my Time Capsule to essentially log in as the user and allow other devices to connect through it. My Time Capsule has worked with other ISPs that don't require the user log in, but I recently moved. I may be wrong about how the ISP is allowing access, I wasn't sure how to describe the problem. Thanks.

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• Where does Vista/Windows 7 store Wireless Connection Information?

  - by BEn

  I am attempting to clean out my dad's laptop, which is running Windows Vista. Somehow, he has managed to accrue 1,400 wireless networks in the "Manage Wireless Networks" control panel. Is there any easy way to clear this list short of reinstalling Windows?

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• Distributing Microsoft Office Template or Macro over the network

  - by zfranciscus

  We have around 400 users who use Word and we want to make their life easier by distributing templates and macros over the network. The easiest way to do this of course to setup a shared network folder and let them get the appropriate templates and macros. Of course, each user has to know where to copy these files to in their local PC, and we have to rely on constant email communication to let them know for newer version of the macro and templates. The next alternative is to ask them to configure Word to point to these network folder. But of course any disruption to the network means disruption to their work. We are thinking to setup a synchronization mechanism that downloads new templates to their local machine. We are also thinking to make this sync tool to prompt users that it will download new templates - you know just to give them visibility that they are receiving changes. We are wondering what is the best approach that people usually use in their workplaces ? Are there any specific tool that can make this task easier ?

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• Simple server status page hosted externally available for users

  - by Chris

  I am looking for any kind of script - can be asp or php or any other web language - that gives me the ability to log outages and the current state of the network for our organisation. This would be similar to any major Telco's "Network Status" page, but I just want to tell the user's out there if the systems are up and running and have a history of recent outages. This would be for our remote user's so they could go to a webpage (externally hosted from our main site) and see that we are currently having problems with our network. What are other people out there using?

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• Bridging networks problems

  - by Eric

  In my setup I have 3 computers and 2 (wireless d-link) routers. Computer1 has ethernet and wireless interfaces ethernet : 192.168.0.x (DHCP) wireless : 192.168.10.254 (static) Computer 2 has ethernet with two ips ethernet1 : 192.168.0.90 (static) ethernet2 : 192.168.10.110 (static) Computer 3 is a particular device with a hardcoded ip that I can't change wireless : 192.168.10.41 (static) Router1 manages internet and DHCP for network 192.168.0.0/24 Router2 is more complicated. I don't use DHCP. I use it to bridge between both networks. Its static ip is 192.168.10.1 Computer1 can ping Computer2. Computer1 can ping Computer3. Computer1 can ping Router1. Computer1 cannot ping Router2. Computer2 cannot ping Computer3. Computer2 can ping Router2. Router1 can ping Router1 Router2 can ping Computer2 Router2 cannot ping Computer1 Router2 cannot ping Computer3 This is very weird. Router2 manages the wireless connection, it should be able to ping its own computers right? My question is obviously : How can I make it so Computer2 can access everything else. This is a traditional case of "it was working before christmas and now it doesn't". The ethernet wiring is as follow : [ Computer1 ]----[ Router1 ]---[ Router2 ]---[ Computer3 ] I am using switch (lan) ports on Router1/2.

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• Limited bandwidth and transfer rates per user.

  - by Cx03

  I searched for a while but couldn't find anything concrete, hopefully someone can help me. I'm going to be running a Debian server on a gigabit port, and want to give each user his/her fair share of internet access. The first objective is easy - transfer rates (speed) per user. From what I've looked at, IPTables/Shorewall could do the job easy. Is this easy to setup, or could one of you point me at a config? I was hoping to limit users at 300mbit or 650mbit each. The second objective gets complicated. Due to the usage of the boxes, most of the traffic will be internal network traffic that does NOT get counted to the quota. However, I still need to limit the external traffic, and if they go over, cut off access (or throttle traffic to a very low speed (10mbit?)). Let's say the user has a 3TB external traffic limit. The IF part is: If the hostname they are exchanging the traffic with DOES NOT MATCH .ovh. or .kimsufi. (company owns multiple TLDs), count to the quota. Once said quota exceeds 3TB, choke them. Where could I find a system to count that for me? It would also need to reset or be able to be manually reset on a monthly basis. Thanks ahead of time!

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• Can not connect to service with my public IP, only with localhost

  - by Sanoj

  I have installed Linux Mint 8 (based on ubuntu). And I have setup a webserver on port 8098. I can connect to my webserver with http://127.0.0.1:8098, but when I try to connect to http://192.168.1.107:8098 from the same machine or another machine it doesn't work. How can I get this working? Is there any default firewall settings that I have to change?

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• Do I have to use a DNS PTR?

  - by JrSysAdmin

  I am currently working on a site in my free time with a few other guys and we are wanting to redirect xxx.com to our new site, yyy.com. So we have xxx.com set to redirect the 216.111.11.1 which is the IP for yyy.com. However, this just says the website is unavailable so it seems as though we need a DNS PTR to redirect 216.111.11.1 to yyy.com. Is there any way to do this without a DNS PTR? The pointer will cost us $15 and it just seems like there should be some better way to go about doing this. Any ideas?

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• Cisco: changing VTP mode server/client to transparent

  - by J. Smith

  I have around 40 L2 switches (2960, 3560, 3500, 3750) running in VTP client mode and one L3 switch (6500) running in VTP server mode, all connected together. I would like to switch everything in VTP transparent mode without any interruption of service. I've already test on a poc version with 3 switches (Catalyst 2950, 3560 and 3750). Using serial and SSH connection, it is seems working but i'm not sure it is enough representative compare to the real network. Knowing that the VTP Pruning is enabled, I am wondering what would be the best procedure to proceed the changement. I've read that we could lost connection by keeping it enabled. Should I change the server or clients first? Is it important to change the VTP domain and VTP Pruning parameters?

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• Can next hop address be same as destination address?

  - by Raj

  Like if host address is 100.0.0.1 and next hop address is 100.0.0.2 and destination ip address is also 100.0.0.2 Is this a valid use case? Any real life usage? <dest ip> <next hop> ip route 100.0.0.2 255.255.255.255 100.0.0.2 weight 1 next-hop-vrf GlobalRouter Above is the command on a router inside a VRF. 100.0.0.2 is pingable from host. 100.0.0.1 & 100.0.0.2 are an ip address assigned to a VLAN on host & destination respectively. On a linux box, Such configuration is valid. [root]# netstat -r -n Kernel IP routing table Destination Gateway Genmask Flags MSS Window irtt Iface 55.55.55.55 55.55.55.55 255.255.255.255 UGH 0 0 0 eth0 [root]# ip route show 55.55.55.55 via 55.55.55.55 dev eth0 As per my understanding, If a destination IP is reachable (i.e in the same subnet of host IP) we dont need a next hop. I came across one application for using next hop for destination IP in same subnet (i.e for VPN) See this: Will packets send to the same subnet go through routers? If next hop != destination IP but they are in same subnet as that of host, is a valid scenario for VPN, then i am wondering what are the applications of next_hop==dest_ip & subnet same as host? This is my first post in Super User. Extremely happy with the quick and warm response.

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• Extremely poor WiFi reception on new desktop

  - by guy

  I just received a new desktop with a built-in WiFi card (Windows 7 Home Premium x64). However, I am only able to receive any WiFi signal when the computer is within 1-2 meters of a router. Even then, the signal is very weak (Windows 7 says it is "poor"). I have tried this with 2 different routers and see similar results. I have somewhere around a dozen other devices that can connect to both routers with greater signal strength (usually full strength) from much, much further away. When I tried calling support I was instructed to reinstall my drivers and attempt to change the WiFi channel of the router. Neither worked. I was then told that the problem was with my routers and that the computer was functioning normally and that it was certainly not a hardware problem. What would be the cause of this and is there anything I can do to fix it?

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• Siege - running a stress test benchmark

  - by morgoth84

  I need to do a benchmark test of a HTTPS server using Siege, to see how it behaves under massive load. I'm initiating tests from another machine which is quite powerful and it is connected to the same physical switch the server is connected on. But when I initiate a test, I can't get it to make more than 170 requests per second. With this load the server's CPU usage is at 15-20% and the average response time for a request is approx. 0.03 seconds. Load of the client machine is approx. at 10%. So, I gradually increase the number of users in Siege (the number of worker threads) and request rate linearly increases up to 170 reqs/sec, but it never gets over it. No matter how many more worker threads I start, the load on the server is never more than 20% (and the client's load also doesn't increase any more). How can I overcome this? I've googled a bit and found out that after a request is completed, a socket associated with one ephermal port remains in WAIT_TIME state for some time during which it can't be reused. I tried to overcome this by doing these things: sysctl -w net.ipv4.ip_local_port_range="1024 65535" echo 1 > /proc/sys/net/ipv4/tcp_tw_recycle Oh, and the client machine is a Linux (RedHat, I think, but I'm not sure). Any help would be appreciated.

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• Basic connectivity issues between Win 7 and XP mixed wired/wireless network. [Solved]

  - by Pulse

  Setup: Windows 7 x64 Ultimate desktop hard wired to Asus WL500gp router (WL500gpv2-1.9.2.7-d-r1445 firmware) Several Bridged VirtualBox VM's running XP, 7, ubuntu server 10.04, Mint 9 and SuSE 11.2 Win XP Pro SP3 notebook with D-Link Airplus wireless network card. No firewall or other security software currently running on either platform (at least for the duration of the test) Situation: Router is acting DHCP server Clients are receiving correct addresses and additional parameters Internet connectivity is available from all clients Windows 7 sharing is set to Network type = work (not home group) NetBT is disabled on all clients using smb over TCP What I can do: I can ping the router and internet addresses from the wireless XP notebook I can ping the Win 7 desktop and any VM from the XP wireless notebook I can ping all devices from the router All VM's and 7 can ping each other and the router as well as Internet addresses What I can't do: I cannot ping the XP wireless notebook from either the Win 7 desktop or the VM's; it always returns a destination host unreachable error. Tracert resolves the name or the XP notebook but also returns a destination host unreachable. From the above it would seem that something is blocking connectivity in a single direction (from the Win 7 box to the Win XP notebook) only but the router can ping the XP notebook. Some fresh input would be most welcome, as this is beginning to drive me batty. Thanks

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• OpenVPN: Single certificate authority, multiple VPNs

  - by darwish

  The company in which I work has a single site (I'll refer it as "Site A"). There are several private networks within site A. We have a running instance of OpenVPN which allows some employees to connect to one of the private networks in site A. We're planning to extend our facilities to another site (which I'll refer as "Site B") and we wish to connect both sites using OpenVPN. The VPN which will connect sites A to B will be a trunk link, meaning it will have access to all networks. If we use the same certificate authority for both VPN servers, this will allow the employees, which can only to one of the private networks within site A, to connect to the site-to-site link, which will give them access to all networks. Off course this is undesirable. Using 2 different certificate authorities seems like the obvious solution, but it doesn't feel right. I wounder if there's a way to maintain permission control within a single certificate authority.

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• Windows 7 keeps asking for WIFI credentials

  - by RubenGeert

  If I want to log onto our WIFI network, Windows keeps asking for credentials. After many connection attempts (and sometimes some reboots) we finally manage to connect. Then the connection usually stays intact for the rest of the day. But it sometimes takes 15-20 minutes before we're online... Needless to say we're using a single username/password for all failing/succeeding attempts. Does anybody recognize these symptoms? How to troubleshoot this?

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• Random timeout now and then

  - by KenavR

  Maybe this is a to generic question, but since we have this issue for quite a while now, I give it a shot. We have some applications which use HTTP for the connection between the client (website or fat-client) and the server. The Computer who runs this applications is in a Network behind a firewall and a proxy, the server isn't inside the same network. The problem is that every now and then the https Request times out and depending on the Client the Application "hangs" or does some other funky stuff. The problem is definitely inside our network, because if i try the applications outside our network it works fine. Can you give me a hint where i can most likely find the problem?

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• Why does my computer not always automatically request a new DHCP lease when switching networks?

  - by KingJ

  I've noticed an interesting problem recently where my laptop will not automatically refresh my DHCP lease when changing between wireless networks. Instead, it will attempt to use the existing lease for the new network. Of course, since each network has different settings any connections will fail when using the old lease. While Windows will eventually request a new DHCP lease, it's often much faster for me to release the old lease and request a new, correct, lease. It puzzles me as to why this is not automatically done when associating to the network? One possible cause is that the laptop is put to sleep while connected to one network, then woken when in range of the other network. Nevertheless, I would expect that the lease would be renewed when the laptop associates to the other network rather than attempting to use the old lease. It should be noted that the two networks are completely different, both in terms of size, number of APs, network settings, SSIDs etc. One network is my home network and the other one is the campus-wide network at my University.

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• Windows 7/8 can't connect to an N Router

  - by xenoterracide

  I have a router running OpenWRT backfire, with N and A/B/G being broadcast. A linux laptop, and a Mac laptop can see the N network and connect to it (or at least they could last weekend). But there is now a Windows 7 Desktop with a B/G/N wireless card, and a Windows 8 Laptop with a B/G/N wireless card that can't see the N network only the B/G broadcast. The B/G and N have different SSID's and Encryption ( WEP and WPA2 PSK respectively ). The N SSID isn't even visible. Does anyone have any suggestions as to how to troubleshoot further? Or what might be the cause? update wireless info Desktop Dell Wireless 1502 802.11b/g/n Atheros Communications Inc 9.2.0.412

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• How to get the speed of a network card on the command line?

  - by nelaar

  I am trying to see what the speed of some network cards on a remote server. Our reporting software says they are 10Mbps, but I am sure that is wrong they should be 1Gbps. Our monitoring software uses SNMP to query the servers, perhaps the servers are reporting information incorrectly. ifconfig does not report what the speed of the devices are. How can I see what the currently configured speed of the cards are.

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• Can't access certain web sites - reset router, any ideas?

  - by IniTech

  EDIT: This problem was resolved by my ISP - had to do with damaged fiber in one of their locations. Thanks to everyone that helped. Not sure if this is the right site (I'm a StackOverflow user) so I thought I'd give it a shot. I'm having trouble connecting to certain sites on any of the 3 machines that are on my LAN. The following sites are returning "Problem Loading Page - The connection has timed out" Sourceforge.net CNet.com Microsoft.com OpenDNS.com even my company's webiste I was worried about possible malware/virus, but I don't think that is the case (given the inability to access my company's site and the fact that all 3 machines are having the same issues.) I've tried with IE8, FF, and Chrome I have reset my router (WRT54G) and my machine(s) multiple times. EDIT: It is also worth noting that this page spins constantly and no avatars show up (I'm assuming it is trying to access gravatar.com with no success.) EDIT: I have the same issues directly connected to the modem. So, any router config is probably not the issue I'm a programmer, not a network guy - any ideas?

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• Hyper-V can't connect from host to guest via RDC

  - by Mark

  As the title describes I would like to connect via Remote Desktop Connection to my VM. I want to use it as a Dev-machine and therefore would like to work full screen, as far as I understand RDC is the way to go. I have created an internal network connection within Hyper-V, assigned it to my VM, set a static IP/Subnet on guest (Win7 Pro) and host(Win8.1 Enterprise). It worked good for the first couple of times but now it seems to be broken or I have to do odd enable/disable network connection "dances" to get it running. Ping also doesn't work always so it does seem as if the guest and host would be "disconnected".. Is there something I can do so that the network connection always will be established?

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• Are neighbors formed in EIGRP and OSPF always directly connectly?

  - by xczzhh

  I always thought that neighbors formed in EIGRP were not necessarily directly connected because the only requirement for two routers to be neighbors is that they share the same Autonomous System and K-values, but it seems that I was wrong. I have looked up several books, they do not seem to give a clear answer. And I am even more confused with OSPF... Please, give me some light here. Thank you.

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