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• Intermittent 5.7.1 email bounce to Exchange 2007

  - by Steve Kennaird

  My knowledge of Exchange isn't particularly great, so excuse me if some of the terminology I use isn't quite right. I'm primarily a web developer who's now responsible for a small business's network. We have a server running SBS 2008 and Exchange 2007. Generally, everything works well, emails are able to be sent to both internal and external domains without issue. We've only got ~20 users, Exchange is sitting on a single server. I use SendGrid to send emails generated by our externally hosted website to users in the office. Primarily, order notifications are sent to [email protected]. Without any pattern and less than once per week on average, an email to [email protected] will bounce back, and the logs on SendGrid detail the following error: 550 5.7.1 Unable to relay for [email protected] Either side of that failed delivery attempt, I'm able to send and receive emails to/from [email protected]. Having done some research, incorrect reverse DNS seems like it could be a cause of intermittent bounces like this. Having used nslookup, I have found that the reverse DNS doesn't map like it should, e.g. Office IP: 135.325.351.123 (made up IP, for example only) Domain: office.somedomain.com (made up, for example only) Reverse DNS: somedomain.gotadsl.co.uk (half made up) Could this be a cause? I'm sure that the IP address and the domain should map to each other. Also, it has been suggested to me that as the Exchange server is on a network with an ADSL connection, that could be a potential cause as the connection "goes up and down all day long". I don't have an opinion on this, as I don't have enough knowledge of Exchange/ADSL to form a reliable opinion. Can anyone offer any insight as to whether one or both are actually potential causes, or if there is another possible cause?

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• Isolating a computer in the network

  - by Karma Soone

  I've got a small network and want to isolate one of the computers from the whole network. My Network: <----> Trusted PC 1 ADSL Router --> Netgear dg834g <----> Trusted PC 2 <----> Untrusted PC I want to isolate this untrusted PC in the network. That means the network should be secure against : * ARP Poisoning * Sniffing * Untrusted PC should not see / reach any other computers within the network but can go out the internet. Static DHCP and switch usage solves the problem of sniffing/ARP poisoning. I can enable IPSec between computers but the real problem is sniffing the traffic between the router and one of the trusted computers. Against getting a new IP address (second IP address from the same computer) I need a firewall with port security (I think) or I don't think my ADSL router supports that. To summarise I'm looking for a hardware firewall/router which can isolate one port from the rest of the network. Could you recommend such a hardware or can I easily accomplish that with my current network?

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• Virtualizing an Inline network appliance with VirtualBox (or VMWare)

  - by Tzury Bar Yochay

  My device, which is a Linux based IP in-liner is transparent to the network peripherals, that is, no IP address assigned to any of its interfaces. For the sake of the conversation, let's use ADSL connection as an example, while the device is inspecting the bi-directional traffic, the network is behaving same as if device was not there, attached to the wire (see Physical setup at the attached diagram). I wonder if I can enclosed that "device" within a Windows machine and have it operated virtually so it still seats inline between the ADSL router and the Windows netwroking interface by using virtual NICs, (or whatever their name is in windows), and inspecting the traffic, same as if it was on a separate physical device, the drawing under "Virtual Setup" in the attached diagram show what I am trying to achieve. Reading a bit on the VirtualBox docs, seems like binding the right side is relatively simple, perhaps I should have one network adapter set as Bridge Networking and VirtualBox will connect it to the physical NIC on the host machine, and network packets are exchanged directly, circumventing the host operating system's network stack (WinXP in my case). However, I have no idea how to achieve the left side of my diagram, which requires adding virtual NICs to windows and configure them correctly in a way to make that pipeline possible. I would appreciate any help. by the way, if that is not possible with VirtualBox but with other virtualization solution (e.g. VMWare), I would accept the other as well.

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• pfsense 2.0 traffic priority - set full priority for single host

  - by Waxhead

  I have a network with several computers all on the same network and since I have very limited bandwidth I would like to prioritize traffic almost like a CPU scheduler prioritize processes. Example: Computer A: Used for webstuff: YouTube, downloads, news, emails etc. Computer B: Transferring files over HTTP Computer C: Transferring files over ftp, rsync whatever What I would like to do is to give A up to for example 90% of the available bandwidth IF A requires it. The leftovers (10%) is divided between B and C (5% each if both is busy) If A is not utilizing all bandwidth then of course B and C should share the full bandwidth (50% each as long as both are maxing out their bandwidth). All computers are on the same network (192.168.1.0 - 192.168.1-10 for example). Appreciate if anyone could shed some light on how I should set up my network to achieve this. To be honest I actually need a step by step guide on how I should set this up. Network setup: (ADSL modem configured in bridge mode (1500kbps/300kbps)) [ADSL modem (bridge)]<-[pfsense2.0]<-[switch]<-[Computer A,B,C...etc]

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• Need help diagnosing network performance issues

  - by tokes

  I am currently working in a developing country as a system analyst for a government department. My area of expertise is software projects, but I've come across a few issues with the network setup in my office. (Unfortunately, being a developing country, there's not a lot of professional help available for this sort of thing.) Most recently, I am trying to diagnose a problem with slowness on the network. Our office is connected to the internet via an ADSL wireless modem/router (called Router). The modem is connected via ethernet to a switch (called Switch). The modem also acts as a wireless access point (called Wireless1), though because it is in a room at the end of the floor, it's range is limited. There are ethernet ports installed around the office. The cables of these all lead back to the same switch. In closer vicinity to the bulk of the client computers, there is another wireless router that acts as an access point for those clients (called Wireless2). That router is connected via ethernet to a wall port, and therefore to Switch. There is also a Windows server which acts as a DNS server (called DNSBox) which is located in the same room and is connected directly to Switch. ---Internet----------| Router/Wireless1 192.168.10.1 ---------------| |----|=========| DNSBox | |-------------------- 192.168.10.4 --------------------| Switch |---Other clients---- | |-------------------- |----|=========| Wireless2 ------------------| 192.168.10.198 One final thing to mention about the network setup. All clients are configured with manual IP addresses. Their router/gateway is set to the IP address of Router, and their DNS server is set to the IP address of DNSBox (with a secondary IP set to an external IP - that of our ISP's DNS server). Here are the symptoms we are experiencing: Clients connected to Wireless2 AP experience slow and unstable connections to the internet. (Slow here is defined as speeds of ~1KB/s, though ping response times seem to be as normal.) Clients connected via ethernet to Switch also experience the same slowness. Clients connected to Wireless1 AP (i.e. connecting via wireless directly to the ADSL modem) experience normal connections to the internet. Clients connected via ethernet to Router (i.e. connecting via ethernet directly to the ADSL modem) also experience normal connections to the internet. I also tried to gauge the connection performance between two machines on the network via ethernet: A file transfer between two clients who were both directly connected to Switch was the fastest; A file transfer between one client directly connected to Switch, and one client directly connected to Router (which is directly connected to Switch) performed much slower; A file transfer between two clients directly connected to Router also performed slowly. Things I have attempted to diagnose the problem: Restarted Switch -- no change. We tried unplugging ethernet jacks from Switch 4 at a time and testing the internet connection. The thought here was that perhaps a client on the network has contracted a virus, and is possibly spamming the network with traffic? (Not very technical, I know.) Unfortunately we couldn't get any significant increases in performance using this method. There were a couple of times when it seemed to be better, but then the connection speed quickly dropped back to slow/dead pace. I didn't want to unplug all jacks from Switch because I was concerned that users might be affected or that I would re-plug in the jacks incorrectly (should I even be worried about that? a port is a port on a switch, right?) I tried swapping the ethernet cable used to connect Router to Switch -- no change in performance. I tried swapping the port used on Switch for Router -- no change in performance. Anyone got any ideas on what this could be? Should I be mentioning specific brand names/models of the hardware used? Virii outbreaks are common in this country/office -- what could I be doing to figure out if a virus is at fault? If it is a virus, it doesn't seem to be generating a lot of traffic to/from the internet, because a) I can still get a good speed if I am directly connected to Router / Wireless1 and b) our ISP data usage has not risen suspiciously. Thanks for your help! Update #1 Here are the specs of some of the hardware: Switch is an Edimax ES3132RL 32-Port 10/100 Rackmount Switch Router is a D-Link DSL-G604T Update #2 I just tried unplugging everything except a laptop and Router from Switch. Speeds are still slow. I guess that means that Router / Switch are not being flooded? It seems more and more likely that the cause is something to do with the interaction between Router and Switch. However, I still can't find any useful resources on setting the LAN speed for either (and I'm not well-versed in these advanced networking configurations).

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• Stale connection with Pheanstalk

  - by token47

  I'm using beanstalkd to offload some work to other machines. The setup is a bit unusual, the server is on the internet (public ip) but the consumers are behind adsl lines on some peoples homes. So there is a linux server as client going out through a dynamic ip and connecting to the server to get a job. It's all PHP and I'm using pheanstalk library. Everything runs smoothly for some time, but then the adsl changes the IP (every 24h hours the provider forces a disconnect-reconnect) the client just hangs, never to go out of "reserve". I thought that putting a timeout on the reserve would help it, but it didn't. As it seems, the client issues a command and blocks, it never checks the timeout. It just issues a reserve-with-timeout (instead of a simple reserve) and it is the servers responsibility to return a TIME_OUT as the timeout occurs. The problem is, the connection is broken (but the TCP/IP doesn't know about that yet until any of the sides try to talk to the other side) and if the client blocked reading, it will never return. The library seems to have support for some kind of timeouts locally (for example when trying to connect to server), but it does not seem to contemplate this scenario. How could I detect the stale connection and force a reconnect? Is there some kind of keepalive on the protocol (and on the pheanstalk itself)? Thanks!

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• cisco 2911 router vs 2811 router

  - by NickToyota

  Just wondering if anyone has experience with the cisco 2911 or 2900 series routers. I understand it is newer and similar to the 2811 but more robust. The price difference is not that much more. I am trying to determine if I should go with the 29xx or 28xx series for a small-medium sized company. ISP bandwidth load balancing and fail over is required. T1 and ADSL lines already in place.

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• My Ip Address - Windows Vista - ipconfig : Cant find my ip address

  - by meyosef

  Hi, I type in doc $ ipconfig but not get My Ip Address. I get other values but not my ip address. Please help me, Thanks Yosef My Computer: Windows Vista adsl router (for few computers) My Ip is temp each time that i connect web he change

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• Port forwarding - firewall deactivated?

  - by Suma

  In a Port Forwarding guide I have read I should set port forwarding on my ADSL modem and disable its firewall. Until I did both of this, my torrent client was not visible as a server from outside. However, I am unsure what implications disabling firewall has and why it is needed. Can anyone explain this?

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• Setting up a wireless connection

  - by shadeMe

  I've got a DLINK router connected to my ADSL modem that forms the hub of my home network. I've two clients - A desktop with an onboard wireless adaptor and a laptop that's outfitted with the same. The former runs Windows 7 x64, the latter Windows XP x86. I'd like to setup a wireless connection between the two that would allow me play games over to and to a lesser extent, transfer and stream data. How would I go about doing it ?

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• Setting up a wireless connection b'ween 2 clients

  - by shadeMe

  I've got a DLINK router connected to my ADSL modem that forms the hub of my home network. I've two clients - A desktop with an onboard wireless adaptor and a laptop that's outfitted with the same. The former runs Windows 7 x64, the latter Windows XP x86. I'd like to setup a wireless connection between the two that would allow me play games over to and to a lesser extent, transfer and stream data. How would I go about doing it ?

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• how can I reconnect DSL in cisco router 877w

  - by Sulaiman

  Hi All, I've configured ADSL and added a new public LAN ips for the router. How can I reconnect DSL connection and apply the new configuration without executing the command reload this is the commands I am using for DSL configuration config terminal interface dialer 0 ppp chap hostname User ppp chap password 0 Pass exit exit wr mem and this is the commands I am using for adding IP addresses: configure t interface vlan 1 ip address xx.xx.xx.xx 255.255.255.252 Secondary exit wr mem thank you

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• kerio load balance

  - by Azzam

  I use kerio winroute 6.5 , for week ago, i got a second adsl link (2 mbps), i tried to configue the load balancing in kerio , but always , kerio directs the traffic to one route without the other , i enabled NAT for firewall and change the rate between 2 links but always kerio takes the system route to one link , is there a solution for that ?

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• Can I use sharing for satellite card with Dial UP Conniction

  - by Eias.N

  Hello ,, I want to buy a SkyStar card to view satellite channels in my PC , I'm planning to use Sharing servers to view all JSC Sport Channels , the question is Can I use sharing service with Dial up Connection (40 k.b) , Will the picture gone from time to time ? or it will work perfectly ?Have I use ADSL ? THANK YOU

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• How to prevent wifi router from broadcasting multiple ssids?

  - by user1092288

  I have the following Wi-Fi router: http://www.beetel.in/business-solutions/international-business/adsl/450-four-port-wifi-modem And I am also posting screen shots of ISP settings (from 192.168.1.1). Problem is, my Wi-Fi router is broadcasting multiple SSIDs (even the SSIDs which I used in the past and aren't entered in settings at present). How do I resolve this to broadcast single SSID? I have already tried factory settings restore. SSID1 Settings SSID2 Settings SSID2 Settings- greyed-out, unable to change anything

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• Windows CE Netbook wireless connection problem

  - by VG

  My Windows CE Netbook connects to wireless network at work but can't connect at home. I tried it at work just to test that the WiFi on the Netbook does actually work and it was fine (if a bit slow) It can see the connection, and the signal, tries to "Associate" with my home network but "Fails" it will sometimes retry Encryption is set to TKIP Authentication WPA-PSK EAP Type TLS I have tried all sorts of other settings but there seems to be very little to try?? My Modem is a DLink Wireless ADSL Router G604T Would appreciate some help if possible.

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• Need a temporary but fast internet solution in the UK, does it exist?

  - by Nick Bolton

  I've looked into mobile 3G, but the download limits seem to be very low; the best I've seen is 10GB (from Orange). Ideally, I could go for something like ADSL, but the problem is that I'd need BT land-line, and isn't the minimum contract 12 months? Are there any other options I haven't considered? Please answer specific to the UK (United Kingdom).

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• is access to samba share dependent on internet access

  - by Ravi

  Running Ubuntu 7.04. Samba is installed and running. Ubuntu server is connected to the internet thru an adsl modem. Rest of the network consists of windows-xp machines All xp machines can see the shared samba folders when internet access is on. If however , the internet access is interrupted , then the samba server cannot be viewed and no sharing occurs. Is samba folder sharing dependent on internet access ?

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• Network Manager kicks off abruptly

  - by Vijay Selvaraj

  I have installed Ubuntu 10.10 and trying to connect with my ADSL Wireless broadband internet modem using Linksys WUSB600N receiver. The good news is the OS is able to detect my wifi network and I am able to hook to network over WPA authentication with basic settings. But the network goes off abruptly and never connects again until I reboot the machine. I have Windows 7 as dual boot on my machine. The same adapter works perfectly with Windows 7 but not in Ubuntu. Is there anything in need to tweak to make things working or do I need to try any other better network manager on Ubuntu?

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• My website dns_server_failure when using University Connection

  - by iMohammad

  My website used to open just fine in the past when I use my University connection, but now since I transfered my website to another hosting company this problem started to appear. Some times the website open and sometimes I get this alot!: Network Error (dns_server_failure) Your request could not be processed because an error occurred contacting the DNS server. The DNS server may be temporarily unavailable, or there could be a network problem. For assistance, contact your network support team. Do you have any idea? I checked using websites checking tools and my website was running just fine on any other connection , ADSL, 3g but except my University connection. Thanks in advance :) UPDATE: When I open my website using the Real IP Server it does open just fine. But with my domain nope. Also, even other websites that are hosted on my server cannot be opened too

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• How to prevent ubuntu from connecting to wifi hotspots automatically

  - by calvin tiger

  Note: this question is distinct from "How to disable automatically connecting to WiFi?", as I do not wish to disable automatic WiFi connection in general. Problem: The Ubuntu WiFi module connects automatically in priority with WiFi networks without a password, even if there is a already known password-protected WiFi network nearby. Worse, most of the times these "unprotected" networks are in fact hotspots that require authentification from the browser. Example: I am at home, and most of the times my Ubuntu laptop will connect by itself to a nearby hotspot instead of choosing my local ADSL box (password-protected, with a password that is already known by the computer). I then have to select my own WiFi network manually. Is there a way to disable automatic connection to /all/ hotspots ?

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• Moving My Blog

  - by Hirt

  Oracle has, unfortunately, moved to a new blogging platform. For security reasons, it is no longer possible to use external tools, such as Windows Live Writer. Since this makes it too time consuming for me to blog, I've decided to only use my private blog, even for work related blog entries. This is where you can find my blog entries, from now on:http://hirt.se/blog/ Note that it is hosted on the poor server in my garage, hooked up to an ADSL-modem. It will probably be dog slow. Sorry for that.

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• Ubuntu Desktop on PC as an IPv6 router?

  - by Cliff

  I have a DELL PC with Ubuntu 12.10 and a pandaboard running the latest linaro ubuntu 12.08. The Ethernet on the panda board is reporting 'no ipv6 router present' regardless of what router I connect (they are all probably not ipv6). I can connect via a cross-over Ethernet cable the pandaboard to the DELL PC. Can I setup the DELL PC to act as an IPv6 router. the PC has a wireless connect to our router/ADSL box. I would Really appreciate some help here so if you have an alternative please suggest it.

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• How to establish VPN Connection using Vodafone K3773 HSPA USB Stick?

  - by user1889139

  I am using Ubuntu 12.04 Desktop. I am trying to establish VPN PPTP connection to Ubuntu 12.04 Server. VPN connection available when PC is connected to LAN - ADSL modem - Internet - VPN Server. No VPN connection available when using 3G modem Vodafone K3773 HSPA USB Stick - Internet - VPN Server. Internet is connected. VPN is not. How to establish the VPN Connection? Server side log: GRE: Bad checksum from pppd.

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• Le prix de l'abonnement Internet en fonction de la consommation réelle serait envisagé, vers une fin des offres illimitées ?

  France : Le forfait internet au Go fixe est un scénario envisageable, bientôt la fin des offres illimitées ?Dans les prochains mois, il n'est pas exclu de voir se mettre en place une nouvelle législation autour de la facturation internet comme c'est déjà le cas en Allemagne où les forfaits dans le fixe sont déjà segmentés en fonction des protocoles (P2P, VoIP?) ou de la consommation générale.Depuis le mois d'avril dernier, Deutsche Telekom, l'opérateur principal en Allemagne, a en effet déjà imposé à ses nouveaux clients xDSL et fibre des quotas. Passé un certain seuil (75 Go pour les abonnés ADSL, 200 Go pour le VDSL, 300/400 Go pour les abonnés FTTH), les abonnés voient désormais leur débit sombrer à que...

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