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• How to create a static IP on Windows Server 2008 R2 so I can access the server remotely

  - by Aesir

  I have just purchased a HP Proliant N40L which I am intending to use as a NAS, learning tool and just in general something to mess around with. As a student via the Microsoft dreamspark program I can get a free copy of Windows Server 2008 R2 which I am using as the OS. So that I can remote to the box from outside of my local network and so that I can stream media from it to my PS3, I have read that I need to create a static IP for the server and use port forwarding to forward to this IP so I can remote in. Is this correct? I am not really sure how to do this and if I need to make these changes on my router configuration, on the OS or both. I am a novice when it comes to networking however most resources for Windows server 2008 R2 seem to assume a fair amount of experience already. I realise that using this particular OS may seem like overkill for what I currently wish to do with it (stream content to other devices and backup) but as I can get a copy for free it seems sensible. Edit: From reading answers posted I feel I should give more information. I have now tried to add a static IP address using my router configuration settings. I have used the getmac command to get the mac address of the server. My ISP is Virgin Media and I have gone to the LAN IP section and I have added an IP address to the DHCP Reservation Lease Info. I can now use remote desktop connection internally to remote to the server (so I am assuming assigning this IP has worked). How do I configure this on the OS as well? I am also unsure on how I would remote to this machine outside of my local network?

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• Very Slow DSL (ethernet) speed [New Interesting Update]

  - by Abhijit

  Very IMPORTANT and INTERESTING UPDATE: Due to some reason I just thought to do a complete new setup and this time I decided to again have openSUSE plus ubuntu. So I first reinstall lubuntu and then I installed OpenSUSE 12.2 (64 bit). Now, my DSL speed is working very normal and fine on opensuse. So this is very scary. Is it possible for any operating system to manipulate my NIC so that it will work fine only on that operating system and not on another os? Regarding positive thinking and not being paranoid, what is it that makes ONLY suse to get my NIC to work at normal speed but ubuntu can not do it? Not even fedora? Not even linux mint? What all these OS are lacking that enables suse to work great? == ORIGINAL QUESTION == I 'was' on opensuse 12.2 when my dsl speed was normal. Yesterday I switched from opensuse to ubuntu 12.04 and speed decreased. It came to range of 7-10-13-20-25-kbps. Then I switch to linux mint, and then to fedora. Still slow speed. When I was in ubuntu I disabled ipv6 but still no luck. Now I am in fedora but this time with DIFFERENT ISP. And still I am getting very slow sped. So my guess is this is nothing to do with os. What can be wrong? Is this problem of NIC? Does NIC speed decreases over time? Does NIC life ends over time as with keyboard or mouse? Help please All the os I used are 64 bit and my laptop is Compaq Presario A965Tu Intel Centrino DUal Core. Interesting thing to notice is I get normal speed while downloading torrent inside torrent client softwares. This slow speed issue applied to download from any web browser or installing software using terminal.

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• Different external ip addresses from different sites

  - by user630286

  My router is ClearOS 6(Centos 6). In my router, I have two external (internet) network connections from two ISP's. The primary connection is eth2 connected to a cable modem and the second one is ppp0 connected to a dsl modem. I have assigned eth2 as the primary connection (with a high metric value). In fact this is done through clearos's multiwan web interface. I have a test in my Nagios to monitor whether the primary connection. This connection is done based on the result of curl ifconfig.me But it seems that ifconfig.me is always giving the ip address of my secondary connection. I tested it through a browser. Yes ifconfig.me gives the secondary internet's(ppp0) ip address. But whatismyipaddress.[com|org] give my primary ip address (eth2). I checked the default route on the router through ip route list 0/0 which also shows the primary connection (eth2) as the default route. The traceroute www.google.com and traceroute ifconfig.me both seems to trace through the primary connection (eth2). As our secondary internet connection has only got a limited download, I don't want to end up having to pay a large sum at the end of the month. Has somebody got an idea why the ifconfig.me shows my secondary address? What is the best way to ensure that my router(and thus the lan) use the right internet connection.

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• Trouble connecting to a local SQL server instance from the web

  - by dfarney

  We have a small network behind a firewall (WatchGuard XTM 2 series) and network switch. On our network we have multiple instances of SQL server, but 1 in specific that I would like to be able to access remotely from our website. We have a static IP address from our ISP and then all the machines on the network have a locally assigned dynamic IP address. When trying to connect to the database from outside our network how do I get the request to be directed to the proper machine / SQL instance? Is it a parameter in my connection string or something in my firewall? A few things to rule out: 1) The firewall is allowing access from the website to our network. I added the site's IP and opened up port 1433. Also, when trying to connect and monitoring the firewall no exceptions come up as they did before I added the proper IP address. 2) Remote connections on the SQL server has been setup and enabled. I've done a lot of reading up on remote connections and I am sure it has been setup properly. I am currently getting this error message on my site: A network-related or instance-specific error occurred while establishing a connection to SQL Server. The server was not found or was not accessible. Verify that the instance name is correct and that SQL Server is configured to allow remote connections. (provider: TCP Provider, error: 0 - A connection attempt failed because the connected party did not properly respond after a period of time, or established connection failed because connected host has failed to respond.)

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• Hosting multiple websites from home

  - by dean nolan

  I have just been accepted for Microsofts Wevsite Spark program which I mainly got for the tools, Visual Studio, Blend. I also have a few of my own websites, personal and a couple of business ones. I also work freelance and sometimes I would like a place to just put a demo up of a clients project. The websites I currently have are all on differnet hosting provders and domain registrars. The WebsiteSpark comes with Windows Server 2008 and SQL Server 2008. It would be really advantagous of me to have all these in one place but also so I have complete control over the database and the environment. So I am thinking over the next 4-6 months of migrating all this to my own server that I will host from home, or maybe even setup at home and then store in a proper datacentre. I was wondering what steps I should take and what to be aware of, specifically: 1) having all these different websites on one computer and having the url got to the proper place. 2) Cost effectiveness? Having the server in home as apposed to datacentre. Most solutions I see charge over £1000 a month to have a machine in datacentre. This is mostly for my own ease of management and shared hosting which I currently have is very limited configuration wise. Would getting a server in house be beneficial for then upgrading to the cloud? What measures should I take with my ISP? I know this is a lot I've asked but just even links to good articles would be good. Thanks

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• Can't find PC on network

  - by Simon Verbeke

  I just got myself a new laptop, and set it up. It is connected to the wireless internet in my home. I then wanted to create a homegroup between the laptop and my desktop, but they can't find each other. Probably because the desktop has a wired connection to the router and the laptop is connected to a wireless access point. The router and the AP are connected to a switch in the middle by cable. A sketch of the network: Laptop - - - Wireless Access Point ----- Switch ----- Router ----- Desktop ^ ^ ^ ^ Wireless Wired Wired Wired They both point to the same gateway and DHCP-server (on 192.168.0.1). And I can ping to that address from both PCs. When I try to ping either of the PCs the pings time out. The subnets are also the same (255.255.255.0) and the IPs are in the same range (192.168.0.114 laptop, 192.168.0.205 desktop). So I don't really understand what I need to do to be able to access either computer from the other. The weird thing is that Synergy (to use mouse and keyboard over the network) works, just by using the IPs assigned to both PCs. The acces point is a linksys WAP54g, but I'm unsure of the Router, it has a custom casing from our ISP and hides any clues for identifying the product. I'm going to google a bit so I can add that info later. Both PC's are Windows 7 64 bit. The desktop is Ultimate, the laptop Professional.

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• DHCPD (Slackware) - Disabling auto-generation of gateway as DNS server

  - by Dogbert

  Good day, I am using a Linux workstation on Slackware 13.37. One "problem" I have had to deal with ever since 11.0 is the following: DNS servers are queried and determined at startup by DHCP daemon (DHCPD) This is invoked at startup by a script located at /etc/rc.d/rc.dhcpd My DNS servers for my ISP are resolved correctly, and are stored in a list located at /etc/resolv.conf However, the one annoying problem is that my gateway IP (ie: 192.168.1.1) is always automatically put at the top of the list in resolv.conf, meaning I have to always wait for a timeout before a valid DNS server is used to resolve an address (ie: timeout on 192.168.1.1 because it is not actually a DNS server, then DHCP uses the next server in the list). I could lower my DNS resolution timeout so the gateway query times out quicker, but that's not what I want, as I don't want to degrade the abilities of legitimate DNS servers. What I would like to do is change how DHCPD operates so that it does NOT put my gateway IP address at the beginning of this list. I've searched via "man dhcpd", etc, and haven't found the exact answer yet. Any help on this issue is appreciated. Thank you all in advance for your time and assistance.

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• How to better copy&paste big files over RDP?

  - by WebMAOhist

  Recently I was making a few attempts to copy&paste a big (1.2 GB) file to remote computer over RDP. The remote computer is virtual testing machine with MS Windows Server 2008 Datacenter. First I tried to copy&paste before midnight when the transfer speed was limited by client computer ISP to 100 kB/s. So, it required a few hours and I was forced to cancel transfer since remote desktop became too unresponsive and sluggish (slow). So, I re-started it over midnight when my local transfer speed is over 4 GB/s 4MB/s (sorry for typo). So, my impression is that independently on speed (broadband) of copy&paste transfer the remote computer becomes sluggish while copying over RDP. At the same time downloading from internet doesn't make remote host sluggish. AFAIU, it is because clipboard of remote computer and so its memory becomes overloaded by transfer. How can I control (restrict) the usage of clipboard for specific process (pasting of file)? What are the possible way to control it? Update: After reading that slow speed of transfer is caused by encryption used for copy&pasting over RDP and since I believe I am more interested in overall efficiency: both the time, or rapidness, of getting file as well as possibility to work without waiting, I changed the question title from: How to control the usage of remote desktop clipboard usage for pasting a big file? to How to better copy&paste big files over RDP? For example, is it better to copy&paste one huge (zip) archive or unzip it and copy paste a folder with unzipped files? And more exactly I wanted to ask: What are possible ways to improve overall experience: the speed of transfer (i.e. availability of needed file) responsiveness of remote host (making remote coputer available for work before completion of copy&pasting)?

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• Postfix connects to wrong relay?

  - by Eric

  I am trying to set up postfix on my ubuntu server in order to send emails via my isp's smtp server. I seem to have missed something because the mail.log tells me: Jan 19 11:23:11 mediaserver postfix/smtp[5722]: CD73EA05B7: to=<[email protected]>, relay=new.mailia.net[85.183.240.20]:25, delay=6.2, delays=5.7/0.02/0.5/0, dsn=4.7.0, status=deferred (SASL authentication failed; server new.mailia.net[85.183.240.20] said: 535 5.7.0 Error: authentication failed: ) The relay "new.mailia.net[85.183.240.20]:25" was not set up by me. I use "relayhost = smtp.alice.de". Why is postfix trying to connect to a different server? Here is my main.cf: # See /usr/share/postfix/main.cf.dist for a commented, more complete version # Debian specific: Specifying a file name will cause the first # line of that file to be used as the name. The Debian default # is /etc/mailname. #myorigin = /etc/mailname smtpd_banner = $myhostname ESMTP $mail_name (Ubuntu) biff = no # appending .domain is the MUA's job. append_dot_mydomain = no # Uncomment the next line to generate "delayed mail" warnings #delay_warning_time = 4h readme_directory = no # TLS parameters smtpd_tls_cert_file=/etc/ssl/certs/ssl-cert-snakeoil.pem smtpd_tls_key_file=/etc/ssl/private/ssl-cert-snakeoil.key smtpd_use_tls=yes smtpd_tls_session_cache_database = btree:${data_directory}/smtpd_scache smtp_tls_session_cache_database = btree:${data_directory}/smtp_scache # See /usr/share/doc/postfix/TLS_README.gz in the postfix-doc package for # information on enabling SSL in the smtp client. myhostname = mediaserver alias_maps = hash:/etc/aliases alias_database = hash:/etc/aliases mydestination = mediaserver, localhost.localdomain, , localhost relayhost = smtp.alice.de mynetworks = 127.0.0.0/8 mailbox_size_limit = 0 recipient_delimiter = + inet_interfaces = all myorigin = /etc/mailname inet_protocols = all sender_canonical_maps = hash:/etc/postfix/sender_canonical smtp_sasl_auth_enable = yes smtp_sasl_password_maps = hash:/etc/postfix/sasl_password smtp_sasl_security_options = noanonymous Output of postconf -n: alias_database = hash:/etc/aliases alias_maps = hash:/etc/aliases append_dot_mydomain = no biff = no config_directory = /etc/postfix inet_interfaces = all inet_protocols = ipv4 mailbox_size_limit = 0 mydestination = mediaserver, localhost.localdomain, , localhost myhostname = mediaserver mynetworks = 127.0.0.0/8 myorigin = /etc/mailname readme_directory = no recipient_delimiter = relayhost = smtp.alice.de sender_canonical_maps = hash:/etc/postfix/sender_canonical smtp_generic_maps = hash:/etc/postfix/generic smtp_sasl_auth_enable = yes smtp_sasl_password_maps = hash:/etc/postfix/sasl_password smtp_sasl_security_options = noanonymous smtp_tls_session_cache_database = btree:${data_directory}/smtp_scache smtpd_banner = $myhostname ESMTP $mail_name (Ubuntu) smtpd_tls_cert_file = /etc/ssl/certs/ssl-cert-snakeoil.pem smtpd_tls_key_file = /etc/ssl/private/ssl-cert-snakeoil.key smtpd_tls_session_cache_database = btree:${data_directory}/smtpd_scache smtpd_use_tls = yes

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• Cisco 851 (IOS) router: FastEthernet 4 (WAN) got the shutdown flag.

  - by cjavapro

  At a customer location there was a Cisco 851 router (which uses IOS). The PCs on location were all of a sudden unable to connect. We came on site and found that FastEthernet 4 (the WAN port) was "administratively down". We ran these commands to resolve it config t interface fa4 no shutdown exit exit write Now the mystery is how the shutdown flag got there in the first place? The router was on battery backup... but during the outage it was power cycled by the customer. It is possible that there was a short outage by the ISP and that the power cycle caused the shutdown flag to come up. There may have been a hack or an attack pattern that caused the shutdown flag to come up. There may have been a hack or an attack pattern that the router to become unavailable and then caused the shutdown flag to be added on startup. Question: Does anybody have any clues? or at least remember that they had a shutdown flag come up on their WAN port also?

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• Vyatta masquerade out bridge interface

  - by miquella

  We have set up a Vyatta Core 6.1 gateway on our network with three interfaces: eth0 - 1.1.1.1 - public gateway/router IP (to public upstream router) eth1 - 2.2.2.1/24 - public subnet (connected to a second firewall 2.2.2.2) eth2 - 10.10.0.1/24 - private subnet Our ISP provided the 1.1.1.1 address for us to use as our gateway. The 2.2.2.1 address is so the other firewall (2.2.2.2) can communicate to this gateway which then routes the traffic out through the eth0 interface. Here is our current configuration: interfaces { bridge br100 { address 2.2.2.1/24 } ethernet eth0 { address 1.1.1.1/30 vif 100 { bridge-group { bridge br100 } } } ethernet eth1 { bridge-group { bridge br100 } } ethernet eth2 { address 10.10.0.1/24 } loopback lo { } } service { nat { rule 100 { outbound-interface eth0 source { address 10.10.0.1/24 } type masquerade } } } With this configuration, it routes everything, but the source address after masquerading is 1.1.1.1, which is correct, because that's the interface it's bound to. But because of some of our requirements here, we need it to source from the 2.2.2.1 address instead (what's the point of paying for a class C public subnet if the only address we can send from is our gateway!?). I've tried binding to br100 instead of eth0, but it doesn't seem to route anything if I do that. I imagine I'm just missing something simple. Any thoughts?

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• Discover the public ip of a network without being connected

  - by Martin Trigaux

  Let say, I'm next to a network and can see the traffic (with airodump or similar tool) but can not decipher it (because I am not connected on the network). Is it possible to discover the public ip address of the network ? I know the MAC address of the users connected on the network but do I know the one of the router ? If yes, maybe there is a way to do the matching. I know IP addresses are not forever but some addresses are static and never change. Maybe there is a database of MAC address having recorded that. Google has a database that match MAC address and geographical coordinates so why not with IP addresses ? Other idea, if I know where am I, I can maybe guess the IP range used in the city by the ISP (is it findable ?) and then try to "ping" each IP on the range (if it is a /24, it's possible, even /16 maybe). Will I get some information like the MAC of the box or see some traffic on the network ? These are two ideas I had. I don't know if they are doable, certainly not perfect. Do you think of some others ? By trying several methods, maybe I can get a guess with a bit of luck. Thank you

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• Having two IP Routes/Gateways of last Resort on an HP Switch

  - by SteadH

  We have an HP Layer 3 Switch that is doing IP routing between vlans. The general set up is that the switch has an IP address on each VLAN and IP routing is enabled. On our servers VLAN, we have a firewall that has a connection to the outside world. To set a IP route on the HP router, we use IOS command ip route 0.0.0.0 0.0.0.0 192.168.2.1 where 192.168.2.1 is the address of our firewall, and the zeros essentially mean to route all traffic that the switch doesn't know what to do with out the firewall as a gateway. We're in the middle of an ISP and firewall change. I set up the new firewall and ran the IOS command ip route 0.0.0.0 0.0.0.0 192.168.2.254 (the address of the new firewall). Things started working nicely. When I reviewed the configuration of the switch though, I noticed that it did not replace the previous ip route command, but just added another route. Now, I know how to remove the old firewall route (no ip route 0.0.0.0 0.0.0.0 192.168.2.1), but what is the effect of having these two 0.0.0.0 routes? Is it switch implosion? Will a server just respond back over the route it receives the request from? I've read elsewhere that having two default gateways is an impossibility by definition, but I'm curious about this situation that our switch allowed. Thanks!

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• W2003StdR2 server: DNS dysfunctional!

  - by Tor

  I hate to have to do this, but i feel up that creek with no... well, some of you might know. At the moment my one and only DNS server refuses to do Forwarding. The story is as goes: This site had 2 servers, one W2003SBS and an W2003StdR2. The SBS degraded over a short periode of time, and to not go down with it i decided to move all data over to the other server. This was of course an AD integrated site. Move went ok, the Std server removed from the domain, and the SBS put to rest. For the time being we decided to run the Std as a server only, and no AD. We renamed the internal domain to xxx.local, and set the server up with DNS, DHCP and installed WINS (not activated). Forwarding of DNS is to our ISP through a Netgear Firewall. The same address setup used as before. So - DNS server started and all went ok, clients reconfigured and hooked up and then - after a day's time - internet name resolution stopped working on the server! Nothing had changed, been altered, modified, nothing! What i now get when doing NSLOOKUP is just a 2 sec timeout response! And i have checked and looked, but to no avail. Anybody seen this behaviour before? And yes - ALL servicepacks have been updated on the server. I would be much obliged if anyone in here could lend an ear... and give advice! Thanks.... from Tor in Norway Today is the 14th, and i still have no resolution to this nagging problem. Anybody else got any advice in the matter? Please?

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• BIND having trouble resolving service.graphicly.com

  - by Keith Burgoyne

  Since about two weeks ago, we haven't been able to resolve service.graphicly.com: dig @192.168.0.12 service.graphicly.com ; <<>> DiG 9.3.4-P1 <<>> @192.168.0.12 service.graphicly.com ; (1 server found) ;; global options: printcmd ;; connection timed out; no servers could be reached Digging on the name servers listed for graphicly.com shows that service.graphicly.com is a CNAME to takecomicsadmin.cloudapp.net. Digging on cloudapp.net's name servers seems to fail: dig @NS1.LIVEDNS.MSFT.NET takecomicsadmin.cloudapp.net ; <<>> DiG 9.3.4-P1 <<>> @NS1.LIVEDNS.MSFT.NET takecomicsadmin.cloudapp.net ; (1 server found) ;; global options: printcmd ;; connection timed out; no servers could be reached Somehow, my home ISP's name servers can resolve service.graphicly.com without issue. Has anyone else noticed this problem? Does anyone know what the cause of this problem could be? Thanks!

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• Locked out of our Comcast Business Gateway for seemingly no reason

  - by Tyler

  A little backstory... Last fall we migrated our ISP from AT&T to Comcast at one of our offices. At that time, we received a new modem/router from Comcast and we configured everything to our liking. We've never really had very many issues with the router aside from having to restart it every once in a while. Here's the problem... About three months ago I changed the password on the router from the default. After that, I logged into the router several times to make changes with no issue. During May I logged into the router to add two new static routes, no problems. A week ago, I tried to log into the router and could not. I tried the non-default password that I changed it to, the default, anything and everything I could think of and no luck. I restarted the router on Monday thinking it may just be locked up, but after the restart it would still not let me log in. This router is at our other office about 2 hours from here and I want to avoid having to drive down there and reset to factory defaults, reconfigure, etc. Any ideas?

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• SSH connection times out unless I tunnel in from a different server-

  - by rm-vanda

  OK, so this just started last week - Whenever we try to connect to our server via ssh (we use sftp, as well) - The connection times out. However, when you ssh to any other server and then ssh into the machine - it works flawlessly. Now, the mindblowing thing is that sometimes the ssh connection will succeed. Moments ago, I tried it from another machine, and then my own, and it worked - only to time out the next go around. Last week, simply restarting the ssh daemon worked, but this week, no such luck. I even went in and changed: /etc/hosts.allow ALL : ALL and /etc/hosts.deny is blank. The firewall config hasn't changed - but I even disabled the firewall to see if that would work - It did, for a moment - before cutting off, again. (ufw is set to "ALLOW" not "LIMIT") When I try SSH'ing in from my phone -- it works, fine -- So, it seems the problem is with our ISP/router/gateway - However, I see no log in the router/gateway that says its blocking our connections - And that wouldn't explain why we can SSH into any other server -- except for this one - from our network --- I truly appreciate any insight that anyone may have on this matter -

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• Juniper SSG20 IP settings for email server

  - by codemonkie

  We have 5 usable external static IP addresses leased by our ISP: .49 to .53, where .49 is assigned to the Juniper SSG20 firewall and NATed for 172.16.10.0/24 .50 is assigned to a windows box for web server and domain controller .51 is assigned to another windows box with exchange server (domain: mycompany1.com) mx record is pointing to 20x.xx.xxx.51 Currently there is a policy set for all SMTP incoming traffic addressed to .51 forward to the NATed address of the exchange server box (private IP: 172.16.10.194). We can send and receive emails for both internal and external, but the gmail is saying mails from mycomany1.com is not sent from the same IP as the mx lookup however is from 20x.xx.xxx.49: Received-SPF: neutral (google.com: 20x.xx.xxx.49 is neither permitted nor denied by best guess record for domain of [email protected]) client-ip=20x.xx.xxx.49; Authentication-Results: mx.google.com; spf=neutral (google.com: 20x.xx.xxx.49 is neither permitted nor denied by best guess record for domain of [email protected]) [email protected] and the mx record in global dns space as well as in the domain controller .50 for mail.mycompany1.com is set to 20x.xx.xxx.51 My attempt to resolve the above issue is to Update the mx record from 20x.xx.xxx.51 to 20x.xx.xxx.49 Create a new VIP for SMTP traffic addressed to 20x.xx.xxx.49 to forward to 172.16.10.194 After my changes incoming email stopped working, I believe it has something to do with the Juniper setting that SMTP addressed to .49 is not forwarded to 172.16.10.194 Also, I have been wondering is it mandatory to assign an external static IP address to the Juniper firewall? Any helps appreciated. TIA

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• SSH Connection Error : No route to host

  - by dewbot

  There are three machines in this scenario: Desktop A : [email protected] Laptop A : [email protected] Machine B : [email protected] All the machines have Ubuntu 11.04 (Desktop A is a 64bit one) and have both openssh-server and openssh-client. Now when I try to connect Desktop A to Laptop A or vice-versa by ssh [email protected] I get an error as port 22: No route to host in both the cases. I own both the machines, now if I try same commands from my friend's machine, i.e. via Desktop B, I can access both my Laptop and Desktop. But if I try to access Desktop B from my Laptop or by Desktop I get port 22: Connection timed out I even tried changing ssh port no. in ssh_config file but no success. Note: that 'Laptop A' uses WiFi connection while 'Machine A' uses Ethernet Connection and 'Machine B' is on an entirely different network. Laptop A && Desktop A - Router/Nano_Rcvr provided to me by ISP. So to one Router two Machines are connected and can be accessed at the same time. here is my ifconfig output for both the machines :- Laptop wlan0 Link encap:Ethernet HWaddr X:X:X:X:00:bc inet addr:1.23.73.111 Bcast:1.23.95.255 Mask:255.255.224.0 inet6 addr: fe80::219:e3ff:fe04:bc/64 Scope:Link UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:108409 errors:0 dropped:0 overruns:0 frame:0 TX packets:82523 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:44974080 (44.9 MB) TX bytes:22973031 (22.9 MB) Desktop eth0 Link encap:Ethernet HWaddr X:X:X:X:c5:78 inet addr:1.23.68.209 Bcast:1.23.95.255 Mask:255.255.224.0 inet6 addr: fe80::227:eff:fe04:c578/64 Scope:Link UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:10380 errors:0 dropped:0 overruns:0 frame:0 TX packets:4509 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:1790366 (1.7 MB) TX bytes:852877 (852.8 KB) Interrupt:43 Base address:0x2000

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• Router that allows custom Dynamic DNS server [closed]

  - by Thuy

  I've made my own DDNS service and it works fine using an application running on clients to update the IP. But if for some reason I don't have the choice of using my software and instead I need to use a router to update the IP, it becomes troublesome. For example, I needed to setup IPsec from a customer to me and the customers router/firewall (netgear srx5308) has a dynamic IP which is given from the ISP which can't offer static IPs. So it needs to use dynamic dns for it to work. In this case there really isn't a client to run the software on since it's a router/firewall. Unfortunately it seems that most routers are rather unfriendly towards custom DDNS solutions and most offer only dyndns.com or similar templates. Which was the case with this router too. Leaving me with no way to use my own dynamic dns server IP. I have the option of switching out the customers router and I've been looking around for alternatives and other routers/solutions and I was wondering if anyone on this great site might have been in a similar situation or might just know about some router/firewall that is more friendly towards custom ddns solutions that I might be able to use. Thanks in advance for any help or guidance!

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• Diagnosing Random Network Lag

  - by uesp

  I'm having trouble diagnosing some random lag on a 6 server LAMP cluster serving a MediaWiki site. While we're serving some 100 pages/sec the servers themselves are running fine with less than 0.5 load, no locked processes, no paging, no errors being logged, etc.... Lag is present on all servers and is random: one minute its fine the next it's there. DNS lookups on the servers are randomly slow. For example time nslookup google.com varies randomly from a few milliseconds to several seconds and sometimes times out entirely. While we use IP addresses internally on the cluster this may be a symptom of the root issue. We are not running our own DNS server. The Apache server-status pages randomly lag or time out. Benchmarking using ab between servers shows a few loads sometimes take 3000 ms (almost exactly). Benchmarking server-status on the local server itself usually shows no issue (it showed a lag only once among a few hundred tests). The servers are sitting behind a switch and a firewall which I don't have any access to so I don't know their setup or status. While we are under heavier than normal load a 2 Mbps incoming and 20 Mbps outgoing traffic shouldn't be stressing the switch or firewall should it? My feeling is that it is the switch/firewall or something above them in the ISP like their DNS but can't confirm it. I need some other tests or methods of diagnosing this lag to try and narrow down the ultimate cause.

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• TCP dies on a Linux laptop

  - by Roman Cheplyaka

  Once in several days I have the following problem. My laptop (Debian GNU/Linux testing) suddenly becomes unable to work with TCP connections to the internet. The following things continue to work fine: UDP (DNS), ICMP (ping) — I get instant response TCP connections to other machines in the local network (e.g. I can ssh to a neighbour laptop) everything is ok for other machines in my LAN But when I try TCP connections from my laptop, they time out (no response to SYN packets). Here's a typical curl output: % curl -v google.com * About to connect() to google.com port 80 (#0) * Trying 173.194.39.105... * Connection timed out * Trying 173.194.39.110... * Connection timed out * Trying 173.194.39.97... * Connection timed out * Trying 173.194.39.102... * Timeout * Trying 173.194.39.98... * Timeout * Trying 173.194.39.96... * Timeout * Trying 173.194.39.103... * Timeout * Trying 173.194.39.99... * Timeout * Trying 173.194.39.101... * Timeout * Trying 173.194.39.104... * Timeout * Trying 173.194.39.100... * Timeout * Trying 2a00:1450:400d:803::1009... * Failed to connect to 2a00:1450:400d:803::1009: Network is unreachable * Success * couldn't connect to host * Closing connection #0 curl: (7) Failed to connect to 2a00:1450:400d:803::1009: Network is unreachable Restarting the connection and/or reloading the network card kernel module doesn't help. The only thing that helps is reboot. Clearly something is wrong with my system (everything else works fine), but I have no idea what exactly. I don't know how to reproduce this, but as I said, it happens every several days. My setup is a wireless router that is connected to the ISP via PPPoE. Any advice?

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• Thousands of visits a day from untraceable traffic to website - Serious issue

  - by kel

  At the end of January we noticed a spike in traffic to what JetPack stats says was home/archive page and what Google was classifying as going to /gaming/ which is an archive list in WordPress. This started off as ~3,000 unique visitors and jumped up to 65,000 unique visitors in one day, again all to the "home" page. This happened over a course of a couple of weeks and we thought we were getting attacked. The traffic then dropped off for a few days but then came back but came back as only about ~15,000 uniques a day and has been like that every day since. We came to the conclusion that something wasn't tracking right somewhere and this is legitimate traffic and brushed it off. Now here comes the problem, Google AdSense has just disabled our account for "invalid clicks". We are trying to figure out where this traffic is coming from and stop it if it's not legitimate or figure out a way to track it correctly. Specs for the site: Dedicated server running CentOS 6 with nginx, php-fpm and MySQL. The site is built in WordPress and we use CloudFlare and W3 Total Cache. Analytics being used are Google Analytics, Quantcast, Alexa and Compete. Any kind of help would be awesome. UPDATE: I'm finding more people with the same type of problem and there doesn't seem to be a solution. http://netmeg.com/bot-attack/ http://stkywll.com/2012/03/02/annoying-cyborgs-attach-distort-analytics/ After looking at the access logs I noticed they were all CloudFlare IP's. I looked into that and found out CloudFlare acts as a proxy and there was a way to fix the logs in nginx. They are coming from many different ISP's in the US. They are going to /games/ or /gaming/ (/games/ redirects to /gaming/) and all seem to have the same user agent of Mozilla/5.0 (compatible; MSIE 9.0; Windows NT 6.1; Trident/5.0).

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• How can I monitor network traffic?

  - by WIndy Weather

  I have a home network with about 10 devices including BluRay player [netflix] and both windows and linux machines. I need to collect network traffic statistics so that if questions come up about how much traffic I'm using I have the answer independent of my ISP. I've looked at DD-WRT, but I see that even buying a new router that will be supported is a problem since I might get the wrong version of the hardware. I have a DIR-655 and a DIR-501 - neither of which is supported. I don't mind buying new hardware, but it looks like a crap-shoot to get one that will work. DD-WRT looks like a bad solution unless someone knows of a place to get a router that is guaranteed to work. Does someone know of an arduino or other SBC solution? I have plenty of NAT routers already, so I just need traffic statistics for external traffic. The network is GBit Ethernet inside and Cable / soon to be DSL outside. The DIR-655 only gives me "packets", not bytes transferred oddly enough. Thanks, ww

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• Looking for easiest, most simple solution to run a customised DNS Server for my local network on Windows 7.

  - by Jamie G

  I need to forward some websites, such as http://testing.server/ to an fixed IP address on my local network. I can do this easily on one computer using the hosts file. However, I need this to work for all machines on my network. I think the best way to do this will be to setup my own DNS Servers and add the custom DNS settings there. However, I'm looking for the simplest way possible to do this - I really don't want to spend hours setting up Unix Servers and running tricky terminal based scripts just to do this! My server is a standard Windows 7 machine. My dream would be a nice simple windows program with a GUI where I could input my ISP's DNS server and it would use those records, unless I had specifically set up my own DNS for a domain to use instead. If it had a web based admin system that was accessible from another computer on the network that would be even better. Does anyone know of anything that can do this? Many thanks indeed.

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