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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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• Dual NIC internet access

  - by JavaRocky

  Q1. If a computer had two NICs, lets say windows, on which interface would HTTP traffic (or any for that matter) go out on. Not sure how the routes table would look like. Q2. If one of the NICs link becomes unresponsive, would traffic be automatically routed to the other NIC? Thanks.

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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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• How can I stream audio signals from various devices/computers to my home server?

  - by Breakthrough

  I currently have a headless home server set up (running Ubuntu 12.04 server edition) running a simple Apache HTTP server. The server is near an audio receiver, which controls a set of indoor and outdoor speakers in my home. Recently, my father purchased a Bluetooth adapter, which our various laptops and cellphones can connect to, outputting the music to the speakers. I was hoping to find a solution that worked over Wi-Fi, namely because it won't cost anything (I already have a server with an audio card), and it doesn't depend on Bluetooth. Is there any cross-platform (preferably free and open-source) solution that I can use which will allow me to stream audio to my home server, over my home network, from a wide variety of devices (laptops running Windows/Linux or cellphones running Android/BB/iOS)? I need something that works at least with Windows and Android. Also, just to clairfy, I want something that simply allows devices to connect to my server and output an audio signal without any action on the server end (since it's a server hidden away near my receiver). Any subsequent connection attempt should be dropped, so only one device can be in control of the stereo at once.

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• Gateway on a virtual network interface used by LXC guests

  - by linkdd

  I'm currently having some problems with configuring a gateway for a virtual network interface. Here is what I've done : I created a virtual network interface : # brctl addbr lxc0 # brctl setfd lxc0 0 # ifconfig lxc0 192.168.0.1 promisc up # route add -net default gw 192.168.0.1 lxc0 The output of ifconfig gave me what I wanted : lxc0 Link encap:Ethernet HWaddr 22:4f:e4:40:89:bb inet adr:192.168.0.1 Bcast:192.168.0.255 Masque:255.255.255.0 adr inet6: fe80::88cf:d4ff:fe47:3b6b/64 Scope:Lien UP BROADCAST RUNNING PROMISC MULTICAST MTU:1500 Metric:1 RX packets:623 errors:0 dropped:0 overruns:0 frame:0 TX packets:7412 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 lg file transmission:0 RX bytes:50329 (49.1 KiB) TX bytes:335738 (327.8 KiB) I configured dnsmasq to provide a DNS server (using the default : 192.168.1.1) and a DHCP server. Then, my LXC guest is configured like this : lxc.network.type=veth lxc.network.link=lxc0 lxc.network.flags=up Every thing is working perfectly, my containers have an IP (192.168.0.57 and 192.168.0.98). I can ping the host and the containers from the containers and from the host : (host)# ping -c 3 192.168.0.114 PING 192.168.0.114 (192.168.0.114) 56(84) bytes of data. 64 bytes from 192.168.0.114: icmp_req=1 ttl=64 time=0.044 ms 64 bytes from 192.168.0.114: icmp_req=2 ttl=64 time=0.038 ms 64 bytes from 192.168.0.114: icmp_req=3 ttl=64 time=0.043 ms --- 192.168.0.114 ping statistics --- 3 packets transmitted, 3 received, 0% packet loss, time 1998ms rtt min/avg/max/mdev = 0.038/0.041/0.044/0.007 ms (guest)# ping -c 3 192.168.0.1 PING 192.168.0.1 (192.168.0.1) 56(84) bytes of data. 64 bytes from 192.168.0.1: icmp_req=1 ttl=64 time=0.048 ms 64 bytes from 192.168.0.1: icmp_req=2 ttl=64 time=0.042 ms 64 bytes from 192.168.0.1: icmp_req=3 ttl=64 time=0.042 ms --- 192.168.0.1 ping statistics --- 3 packets transmitted, 3 received, 0% packet loss, time 1999ms rtt min/avg/max/mdev = 0.042/0.044/0.048/0.003 ms Now, it's time to configure the host as a gateway for the network 192.168.0.0/24 : #!/bin/sh # Clear rules iptables -F iptables -t nat -F iptables -t mangle -F iptables -X iptables -A FORWARD -i lxc0 -o eth0 -j ACCEPT iptables -A FORWARD -i eth0 -o lxc0 -m state --state ESTABLISHED,RELATED -j ACCEPT iptables -t nat -A POSTROUTING -o eth0 -j MASQUERADE echo 1 > /proc/sys/net/ipv4/ip_forward The final test failed completely, ping the outside : (guest)# ping -c 3 google.fr PING google.fr (173.194.67.94) 56(84) bytes of data. From 192.168.0.1: icmp_seq=3 Redirect Host(New nexthop: wi-in-f94.1e100.net (173.194.67.94)) From 192.168.0.1 icmp_seq=1 Destination Host Unreachable From 192.168.0.1 icmp_seq=2 Destination Host Unreachable From 192.168.0.1 icmp_seq=3 Destination Host Unreachable --- google.fr ping statistics --- 3 packets transmitted, 0 received, +3 errors, 100% packet loss, time 2017ms Did I missed something ?

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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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• 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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• 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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• Draytek Vigor 2820 static IP's

  - by dannymcc

  I have a Draytek Vigor 2820 router which is connected to our ADSL provider (British Telecom, BT). We currently have one static IP address which is accessible from anywhere outside of our network and points at a simple web server on port 80. We have just been given 5 more static IP addresses which I would like to point at five servers that have static IP's. As an example: Current static IP - 80.123.123.123 New Static IP's - 100.100.100.100-105 Server IP's - 192.168.1.129-133 I have confused myself completely between NAT addresses, static routes and WAN IP aliases. If anyone can give me a clear idea of what I need to do it would be greatly appreciated.

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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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• 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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• Most secure way of connecting an intranet to an external server

  - by Eitan

  I have an internal server that hosts an asp.net intranet application. I want to keep it completely and utterly secure and private however we need to expose some information through a WCF service to another server which hosts our external websites which CAN be accessed by the public. What is the best way to pass information between the two servers with regards to an IT setup, while keeping the intranet in house server completely secure and inaccessible? I've heard VPN was the way to go but I wanted to be sure this was the safest way. Another question what would be the most secure way of passing data in the WCF service?

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• Cannot access a very specific site from my router

  - by DJDarkViper

  This is a problem for me because this site is important to me. It's MY website. And sadly my email is hosted on my site (which I cant access either) When I try to access my website when connected to my Linksys E3000 router, these days it simply just doesn't go through. When I ping it, its all Request Timed Out, and when I tracert C:\Users\Kyle>tracert blackjaguarstudios.com Tracing route to blackjaguarstudios.com [199.188.204.228] over a maximum of 30 hops: 1 <1 ms <1 ms <1 ms CISCO26565 [192.168.1.1] 2 16 ms 15 ms 11 ms 11.4.64.1 3 11 ms 9 ms 11 ms rd1cs-ge1-2-1.ok.shawcable.net [64.59.169.2] 4 20 ms 21 ms 22 ms 66.163.76.98 5 37 ms 36 ms 35 ms rc1nr-tge0-9-2-0.wp.shawcable.net [66.163.77.54] 6 112 ms 84 ms 85 ms rc2ch-pos9-0.il.shawcable.net [66.163.76.174] 7 86 ms 89 ms 90 ms rc4as-ge12-0-0.vx.shawcable.net [66.163.64.46] 8 90 ms 84 ms 85 ms eqix.xe-3-3-0.cr2.iad1.us.nlayer.net [206.223.115.61] 9 97 ms 97 ms 99 ms xe-3-3-0.cr1.atl1.us.nlayer.net [69.22.142.105] 10 128 ms 128 ms 126 ms ae1-40g.ar1.atl1.us.nlayer.net [69.31.135.130] 11 101 ms 97 ms 96 ms as16626.xe-2-0-5-102.ar1.atl1.us.nlayer.net [69.31.135.46] 12 100 ms 97 ms 197 ms 6509-sc1.abstractdns.com [207.210.114.166] 13 * * * Request timed out. 14 * * * Request timed out. 15 * * * Request timed out. 16 * * * Request timed out. 17 * * * Request timed out. 18 * * * Request timed out. 19 * * * Request timed out. 20 * * * Request timed out. 21 * * * Request timed out. 22 * * * Request timed out. 23 * * * Request timed out. 24 * * * Request timed out. 25 * * * Request timed out. 26 * * * Request timed out. 27 * * * Request timed out. 28 * * * Request timed out. 29 * * * Request timed out. 30 * * * Request timed out. Trace complete. C:\Users\Kyle> SHAW Cable being my ISP. Figuring this was all something to do with some setting I made on the router, I reset the thing back to factory defaults. Nope. So I'm at a bit of a loss what to do here, as NO device (Computers, Laptops, Tablets, Phones, PS3/ 360, etc) can access my site or its features, so it's not just my computer either. But every other site is just fine. When I connect to my neighbors router, the site comes up just fine. And shes with SHAW as well. What should I do?!

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• TIME_WAIT connections not being cleaned up after timeout period expires

  - by Mark Dawson

  I am stress testing one of my servers by hitting it with a constant stream of new network connections, the tcp_fin_timeout is set to 60, so if I send a constant stream of something like 100 requests per second, I would expect to see a rolling average of 6000 (60 * 100) connections in a TIME_WAIT state, this is happening, but looking in netstat (using -o) to see the timers, I see connections like: TIME_WAIT timewait (0.00/0/0) where their timeout has expired but the connection is still hanging around, I then eventually run out of connections. Anyone know why these connections don't get cleaned up? If I stop creating new connections they do eventually disappear but while I am constantly creating new connections they don't, seems like the kernel isn't getting chance to clean them up? Is there some other config options I need to set to remove the connections as soon as they have expired? The server is running Ubuntu and my web server is nginx. Also it has iptables with connection tracking, not sure if that would cause these TIME_WAIT connections to live on. Thanks Mark.

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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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• DD-WRT PPTP VPN problem

  - by Tobias Tromm

  I try to configure a DD-WRT as a PPTP client. The VPN Server is Windows Server 2003. This is my scenario: The Windows 2003 Server has set to give to the VPN Client the 10.0.0.81 fixed IP and to add a network route to the remote home. At the remote home I have changed the PPTP Options at DD-WRT to make the connection. The VPN connection is successfully established. ...and Windows successfully add the route to the remote home 192.168.2.X. From the remote home I can successfully access any computer from the VPN server side. The problem is when I try to access the remote home from the Server side. From Server side I only can access\ping DD-WRT ( by VPN Client IP - 10.0.0.81). What's wrong? How I need to do to be a site-to-site VPN? This is what happen when I try to tracert the remote home from local home.

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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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• Has anyone used the sharedband connection bonding product?

  - by John Rennie

  See http://www.sharedband.com/ for details on the product. Obviously Sharedband aren't too keen on giving away their technical secrets, but I would guess that it bonds the connections at the IP layer i.e. their routers send the IP packets to the SharedBand routers over all available lines and the ShareBand routers handle all the virtual circuitry and provide the NATing to whatever IP address(es) they've assigned you. It looks a clever idea, and a good way to provide some resilience over ADSL links. You can even use ADSL links from different ISPs and SharedBand will still bond them for you. But, I find myself wondering how well it really works, and whether it's worth it. The Draytek routers can already load balance (though not bond) up to four ADSL lines, so the SharedBand product really only offers an advantage if you're hosting servers i.e. you can have one IP address to accept incoming connections through all your (working) ADSL lines. But should you really try and host servers using ADSL lines, especially since ADSL upload performance isn't stellar? Wouldn't it be better to use a hosted server, or maybe pay up for a leased line with a SLA? So I'm asking if anyone is using SharedBand, and if so what do you think of it? JR

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• Daisy-chaining network switches with multiple cables

  - by user72153

  This might just be the dumbest question you'll ever read, but I digress. Say I have two 100Mbps Ethernet switches with 2 computers on each, connected together by a single cable. This way, the two PCs on each switch share the 100Mbps bandwidth with the others. If I added another cable between the 2 switches, would there be 200Mbps throughput available between the switches? Or am I completely off my rocker? Thanks for the help.

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• Bonjour/DNS Service Discovery queries

  - by senloe

  I'm trying to implement dns service discovery in my application (no, I'm not asking for a programmatic answer). What I believe is one of my big pain points is generating the query. I know I need to send out a multicast broadcast on port 5353 and want to look for devices of type _ipp._tcp and _print._tcp, but I don't know what the question section needs to look like. For example, in SSDP I sent out a query that looks like the following: "M-SEARCH * HTTP/1.1\r\n" "HOST: 239.255.255.250:1900\r\n" + "MAN: \"ssdp:discover\"\r\n" "ST: urn:schemas-upnp-org:device:Printer:1\r\n" "MX: 5000\r\n\r\n" From what I know about a DNS query I need to send something like: "_ipp.tcp,all,all" but I know there needs to be more. Any pointers to documentation, etc would be greatly appreciated! update rfc1035 appears to contain promising information re the message structure.

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• Wicd not playing well with networks that utilize network access control

  - by Sion

  Starting a couple months ago (might be able to find exact date if necessary) my installation of Wicd stopped being able to see wireless networks that use NAC (Network Access Control) such as Aruba networks. But if I shut down Wicd and start NetworkManager I can connect to said networks and log in to them depending on what the NAC requires. This is the current wicd package installed: net-misc/wicd-1.7.1_pre20111210-r1 This is how I manipulate the network manager running: su -c'/etc/init.d/wicd stop; /etc/init.d/NetworkManager start' What would cause this specific of a problem to occur?

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• Juniper Networks SRX240 as a office router?

  - by Jordan Mendelson

  We're a small (7 person) fast growing startup who just got our new office and we're having a 100 Mbps line installed from Cogent. I'm not familiar with Juniper devices, however the equivalent Cisco appears to be rather expensive. Features we'd like: Offsite VPN access (PPTP or L2TP IPsec) - something Mac compatible IPv6 support NAT - ideally supporting multiple outside addresses mapped to VLANs DHCP DNS forwarding would be nice QoS to keep our SIP phones happy (managed through RingCentral) VLANs for guest/internal The device is going to be connected to a set of SIP phones as well as two Ruckus 7962s for wireless access. Eventually I'd like to connect it to a Juniper ESX switch as we grow. Would a Juniper SRX240 handle this ok?

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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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• IP alias lost when changing main IP

  - by rmflow

  my /etc/network/interfaces: auto eth0 iface eth0 inet static address 192.168.3.75 netmask 255.255.255.0 gateway 192.168.3.0 Situation 1: After linux booted I set an IP alias: ifconfig eth0:0 192.168.3.111 Now ifconfig reports two IP addresses 192.168.3.75 at eth0 and 192.168.3.111 at eth0:0 When I change main IP to another network: ifconfig eth0 192.168.1.111 the alias eth0:0 is lost! Situation 2: After linux booted I set an IP alias: ifconfig eth0:0 192.168.4.111 Now ifconfig reports two IP addresses 192.168.3.75 at eth0 and 192.168.4.111 at eth0:0 When I change main IP to another network: ifconfig eth0 192.168.1.111 the alias eth0:0 stays! How do I properly change main IP, so all my aliases are not lost?

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• Slow transfer speed between two servers

  - by Linux Guy

  I have two servers both network cards speed is 10Gbps The inbound bandwidth between two servers is 10Gbps , the outbound bandwidth internet bandwidth is 500Mpbs Both servers using public ip addresses in public and private network Both servers transfer and connection on nginx port , and the server B used for streaming media , like youtube stream videos I check the transfer speed using iperf utility From Server A to Server B # iperf -c 0.0.0.1 -p 8777 ------------------------------------------------------------ Client connecting to 0.0.0.1, TCP port 8777 TCP window size: 85.3 KByte (default) ------------------------------------------------------------ [ 3] local 0.0.0.0 port 38895 connected with 0.0.0.1 port 8777 [ ID] Interval Transfer Bandwidth [ 3] 0.0-10.8 sec 528 KBytes 399 Kbits/sec My Current Connections in Server B # netstat -an|grep ":8777"|awk '/tcp/ {print $6}'|sort -nr| uniq -c 2072 TIME_WAIT 28 SYN_RECV 1 LISTEN 189 LAST_ACK 139 FIN_WAIT2 373 FIN_WAIT1 3381 ESTABLISHED 34 CLOSING Server A Network Card Information Settings for eth0: Supported ports: [ TP ] Supported link modes: 100baseT/Full 1000baseT/Full 10000baseT/Full Supported pause frame use: No Supports auto-negotiation: Yes Advertised link modes: 10000baseT/Full Advertised pause frame use: No Advertised auto-negotiation: Yes Speed: 10000Mb/s Duplex: Full Port: Twisted Pair PHYAD: 0 Transceiver: external Auto-negotiation: on MDI-X: Unknown Supports Wake-on: d Wake-on: d Current message level: 0x00000007 (7) drv probe link Link detected: yes Server B Network Card Information Settings for eth2: Supported ports: [ FIBRE ] Supported link modes: 10000baseT/Full Supported pause frame use: No Supports auto-negotiation: No Advertised link modes: 10000baseT/Full Advertised pause frame use: No Advertised auto-negotiation: No Speed: 10000Mb/s Duplex: Full Port: Direct Attach Copper PHYAD: 0 Transceiver: external Auto-negotiation: off Supports Wake-on: d Wake-on: d Current message level: 0x00000007 (7) drv probe link Link detected: yes The problem is : as you can see from iperf utility, the transfer speed from server A to server B slow when i restart network service the connection will be ok , after 2 minutes , it's getting slow How could i troubleshoot slow speed issue and fix it in server B ? Notice : if there any other commands i should execute in servers for more information, so it might help resolve the problem , let me know in comments

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