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  • Programmer configuring a new network

    - by David Lively
    I'm in the process of expanding my home network from a couple of laptops on a wireless Verizon FiOS router to include: Linksys 24-port switch Cisco Pix 515 Cisco 3640 router One new development desktop and three new machines to act as a db server, web server and a backup system. My company is moving offices and we've decommissioned some older hardware, which I was able to pick up for the cost of the labor to move it home from the office. The benefits to working with dedicated web and db servers are very valuable to me. I know very little about network topology, other than that everything plugs into the switch, which then plugs into the cheap Verizon router. (Verizon provides a coax connection that the router must translate into Ethernet before I can use it with any of this equipment). Questions: What is the recommended topology for this equipment? Verizon router - Pix - 3600 - switch? Is the 3600 even necessary or desirable? The Verizon router has one WAN port and 4 client ports, all 10/100. Is there any performance benefit at all to wiring multiple connections from the verizon router to the switch, assuming I don't use the Pix? Should I use the Pix? Software firewalls are a pain, and seem silly if I have a device like this lying around. Anything else I should know? Am I wasting my time with this? I also obtained a 7 foot rack, shelves, patch panels, UPS, patch panels, etc, which are going into a conveniently air conditioned closet. All constructive advice appreciated.

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  • Setting my NIC to full duplex

    - by David
    I am trying to optimize the network speed of my Solaris X86 server, and have discovered that the Cisco 3548 that it is connected to has issues with the NIC in my server. The NIC appears to have not been configured fully, and is coming up 100 half-duplex. The 3548 ports are all set to 100 full. Ideally I'd like to have the server set for 100 full, and have been attempting to configure it using ndd commands. However I have had no results. The following command: -bash-3.00# dladm show-dev rtls0 link: unknown speed: 100 Mbps duplex: unknown The NIC shows up as: pci bus 0x0001 cardnum 0x06 function 0x00: vendor 0x10ec device 0x8139 Realtek Semiconductor Co., Ltd. RTL-8139/8139C/8139C+ which should be configurable. I have modified the configuration file from auto config (5) to 100 fdx (4) to no avail. If there is no other choice, I could alter the Cisco 3548 to be 100 half-duplex. However, this solution causes huge performance loss. Currently throughput is about 500Kbps, when it should be around 40Mbps.

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  • ntop to analyse bandwidth usage on multiple ASA 5505

    - by dunxd
    I have set up a netflow server at our data centre, which is connected via VPN to ~40 remote offices using Cisco ASA 5505. The aim is to analyse usage data and find out exactly how the remote connections are being used. I followed through http://techowto.files.wordpress.com/2008/09/ntop-guide.pdf to set up ntop and https://supportforums.cisco.com/docs/DOC-6114 to set up the ASAs. I can see from the Plugin Netflow Statistics page that netflow packets from my ASAs are being received - the counter is increasing. However, I am not seeing any breakdown on the Global Traffic Statistic page after switching to the Netflow interface. I'm just seeing a pie chart showing 100% traffic for eth0. The interfaces and documentation are a little hard to follow so I am not sure I have got things configured correctly. When setting up my NetFlow-device.2 I can specify Virtual NetFlow Interface Network Address - the web UI says This value is in the form of a network address and mask on the network where the actual NetFlow probe is located. is this a Network address (e.g. 192.168.0.0/24) or an actual host IP address (192.167.0.1/24)? If that should be a network address, is this the network in which one of my ASAs is or the network in which my ntop server is? If a host IP address, is this the IP address used by eth0 on my ntop server, the IP address of an ASA, or something else? Do I need a separate virtual interface for each ASA I am collecting netflow data from? Any guidance would be greatly welcome.

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  • Vlans and subinterfaces

    - by Adeodatus
    I've inherited a moderate size network that I'm trying to bring some sanity to. Basically, its 8 public class Cs and a slew of private ranges all on one vlan (vlan1, of course). Most of the network is located throughout dark sites. I need to start separating some of the network. I've changed the ports from the main cisco switch (3560) to the cisco router (3825) and the other remote switches to trunking with dot1q encapsulation. I'd like to start moving a few select subnets to different vlans. To get some of the different services provided on our address space (and to separate customers) on to different vlans, do I need to create a subinterface on the router for each vlan and, if so, how do I get the switch port to work on a specific vlan? Keep in mind, these are dark sites and geting console access is difficult if not impossible at the moment. I was planning on creating a subinterface on the router for each vlan then setting the ports with services I want to move to a different vlan to allow only that vlan. Example of vlan3: 3825: interface GigabitEthernet0/1.3 description Vlan-3 encapsulation dot1Q 3 ip address 192.168.0.81 255.255.255.240 the connection between the switch and router: interface GigabitEthernet0/48 description Core-router switchport trunk encapsulation dot1q switchport mode trunk show interfaces gi0/48 switchport Name: Gi0/48 Switchport: Enabled Administrative Mode: trunk Operational Mode: trunk Administrative Trunking Encapsulation: dot1q Operational Trunking Encapsulation: dot1q Negotiation of Trunking: On Access Mode VLAN: 1 (default) Trunking Native Mode VLAN: 1 (default) Administrative Native VLAN tagging: enabled Voice VLAN: none Administrative private-vlan host-association: none Administrative private-vlan mapping: none Administrative private-vlan trunk native VLAN: none Administrative private-vlan trunk Native VLAN tagging: enabled Administrative private-vlan trunk encapsulation: dot1q Administrative private-vlan trunk normal VLANs: none Administrative private-vlan trunk private VLANs: none Operational private-vlan: none Trunking VLANs Enabled: ALL Pruning VLANs Enabled: 2-1001 Capture Mode Disabled Capture VLANs Allowed: ALL Protected: false Unknown unicast blocked: disabled Unknown multicast blocked: disabled Appliance trust: none So, if the boxen hanging off of gi0/18 on the 3560 are on an unmanaged layer2 switch and all within the 192.168.0.82-95 range and are using 192.168.0.81 as their gateway, what is left to do, especially to gi0/18, to get this working on vlan3? Are there any recommendations for a better setup without taking everything offline?

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  • Blocking of certain file downloads

    - by Philip Fourie
    I have a problem where I cannot completely download a certain file from a server. The file is 1.9MB in size but only 68% is downloaded and then it hangs. I tried and these cases, which failed: Downloaded the file with HTTP Downloaded the file with FTP Moved the file to different FTP and web servers behind the ISA firewall Tried with IIS 6.0 & IIS 7.0 Multiple download clients. Which included FireFox, FileZilla (on Windows) and wget (on Linux) This worked: Downloading other files from the same location on the server. Both bigger and smaller and in size than the original. FTP and HTTP worked. Earlier version of this file (.DLL) works. It is as if the content of this file has an influence on this file being served. Network architecture: Client Machine - Internet (ISP) - ISA Server - IIS 7.0 The only constants are the ISP, Cisco router and the ISA server. Is it possible that something is rejecting the download because of the contents of the file? I am hoping ISA is the culprit... I am not a ISA expert is there somewhere I can look to establish if it is indeed ISA causing this? Update: Splitting the file into two parts with a hex editor results in one half of the file being served correctly and the other part not. Zipping the file results in the file being downloaded successfully. However this is not an option for this particular scenario. Renaming the file and its extension also doesn't work. Update 2009/10/22: It does NOT seems to be ISA that is causing this problem. We connected a laptop (running IIS) on an available public IP and still the file download to 68% before it hanged. The two remaining components are the ISP and the Cisco 800 series router. Anyone knows about an issue on the router perhaps?

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  • Should the MAC Tables on a switch Stack be the same between sessions?

    - by Kyle Brandt
    According to Cisco's documentation: "The MAC address tables on all stack members are synchronized. At any given time, each stack member has the same copy of the address tables for each VLAN." However, when logged into the switch I see the following: ny-swstack01#show mac ad | inc Total Total Mac Addresses for this criterion: 222 ny-swstack01#ses 2 ny-swstack01-2#show mac ad | inc Total Total Mac Addresses for this criterion: 229 ny-swstack01-2#exit ny-swstack01#ses 3 ny-swstack01-3#show mac ad | inc Total Total Mac Addresses for this criterion: 229 ny-swstack01-3#exit ny-swstack01#ses 4 ny-swstack01-4#show mac ad | inc Total Total Mac Addresses for this criterion: 235 ny-swstack01-4#exit ny-swstack01#show mac ad | inc Total Total Mac Addresses for this criterion: 222 Going back and forth this isn't just because it is changing over time either, within certain sessions there are entries that I don't seen from the master session. We are currently waiting to hear back on CIsco from this, but has anyone run into this before? I stumbled upon this when looking into Unicast flooding, one of the hosts that is a destination MAC of flooding has a MAC entry that appears in session 3, but nowhere else. Also, I checked an all sessions show the same aging time.

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  • VLAN across a router to give wireless access to remote sites?

    - by Don
    I've been looking online for this answer, but getting conflicting information. I was under the impression that you couldn't use a VLAN across a router, but maybe it's possible (according to some documentation I see online)? I was hoping someone could clear it up for me. Here's what I'm working with: We have a remote site with a handful of users. We recently gave them an access point (Cisco 1142n) for internal wireless. It's plugged into a switch and working fine (getting IPs from the same DHCP scope as the wired users are getting). Private wireless is set on VL50. At the home office we have private wireless for our internal network working and on VL50, with a test VLAN setup for VL60, which points to our DSL line for the time being. Both private and public wireless works fine internally (not crossing a router). VL50 is named the same at both sites for consistency in naming. If we wanted to give the remote site access to the public wireless (VL60), would that be possible across the routers? For more information, currently the site is connected to the home office via a T1 connection, Cisco routers on both ends. I didn't think it was possible due to the nature of VLANS being layer 2. But, I am from from an expert on this and would appreciate any instruction as to the actual truth of the matter. The end result I'm going for is, how to get our remote sites access to a public (outside) connection along with their private connection, without actually having a DSL (or similar type line) dropped at their location? Thanks in advance for your thoughts.

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  • Browser connects to WCF service but not my WCF client. What can be the reason?

    - by Slauma
    On a production server (Windows Server 2003 SP2) I can connect to a remote WCF service with Internet Explorer 8: When I browse to the URL http://www.domain.com/Service.svc (where my service listens) I get the expected info page of the service displayed. Connection settings in Internet Explorer only specify "auto detect", proxy settings are disabled. If I start a console application (built with WCF in .NET 4.0) on the same server which also tries to connect to the same WCF service it fails telling me that no endpoint was available listening on http://www.domain.com/Service.svc. Configuration of the WCF client: <configuration> <system.serviceModel> <bindings> <wsHttpBinding> <binding name="WSHttpBinding_IMyService" closeTimeout="00:01:00" openTimeout="00:01:00" receiveTimeout="00:10:00" sendTimeout="00:01:00" bypassProxyOnLocal="false" transactionFlow="false" hostNameComparisonMode="StrongWildcard" maxBufferPoolSize="524288" maxReceivedMessageSize="65536" messageEncoding="Text" textEncoding="utf-8" useDefaultWebProxy="true" allowCookies="false"> <readerQuotas maxDepth="32" maxStringContentLength="8192" maxArrayLength="16384" maxBytesPerRead="4096" maxNameTableCharCount="16384" /> <reliableSession ordered="true" inactivityTimeout="00:10:00" enabled="false" /> <security mode="None"> <transport clientCredentialType="Windows" proxyCredentialType="None" realm="" /> <message clientCredentialType="Windows" negotiateServiceCredential="true"/> </security> </binding> </wsHttpBinding> </bindings> <client> <endpoint address="http://www.domain.com/Service.scv" binding="wsHttpBinding" bindingConfiguration="WSHttpBinding_IMyService" contract="Service.IMyService" name="WSHttpBinding_IMyService" /> </client> </system.serviceModel> <configuration> With these settings I can communicate successfully with the remote service from my development machine. Looking around for other options I found that I can specify to use the Internet Explorer proxy settings with: <system.net> <defaultProxy> <proxy usesystemdefault="true" /> </defaultProxy> </system.net> It didn't work and I am not sure if I understood this setting really correctly. (My hope was that the WCF client will adopt the "autodetect" setting of Internet Explorer and then connect the same way to the service like the installed IE.) I also had toggled the useDefaultWebProxy setting in the binding configuration between true and false with no success. Now I am asking for help what I can do? Which settings might be wrong or missing? What could I test and how can I get more detailed error messages to better identify the problem? Thank you in advance!

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  • Does each authenticated WCF client connection need a CAL?

    - by Sentax
    Just like the title says. Does each authenticated WCF client connection to a WCF server that you have developed need a windows CAL? http://www.microsoft.com/windowsserver2008/en/us/client-licensing.aspx Microsoft's licensing on that page sure makes it sound like it, but I can't find anything out there that confirms, or even denies this. Anyone know?

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  • Cloud computing over Client-server: differences, cons and pros ?

    - by Vimvq1987
    As far as I know, Cloud computing might be a evolution in software architect, and it will replace some current architectures, such as client-server. These two architecture seem to share similarities for me (I know very little about both), but I don't know the differences between them. What are the cons and pros of cloud computing over client-server architecture? Thank you so much.

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  • What's the best SOAP client library for Python, and where is the documentation for it?

    - by blackrobot
    I've never used SOAP before and I'm sort of new to Python. I'm doing this to get myself acquainted with both technologies. I've installed SOAPlib and I've tried to read their Client documentation, but I don't understand it too well. Is there anything else I can look into which is more suited for being a SOAP Client library for Python? Edit: Just in case it helps, I'm using Python 2.6.

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  • User created Validator wont call Client side validation Javascript on 'complex' user control.

    Hi All, I have created a user control (from System.Web.UI.UserControl), and created my own validator for the user control (from System.Web.UI.WebControls.BaseValidator). Everything works ok until I try to get the user control to do client side validation. While trying to debug this issue I have set 'Control to Validate' to a text box instead of the custom user control, and the client side script works fine! It appears to me that it has an a issue with my composite user control I have created. Has anyone encountered this issue before? Has anyone else seen client side validation fail on custom user controls? Some extra info : The composite control is a drop down list and 'loader image', as it is a ajax enabled drop down list (using ICallbackEventHandler). I know that the client side javascript is being written to the page, and have placed an alert('random message') as the first line in the validator function that only appears if it is validating a text box (i.e. not when it is validating my custom control) Language : C# (ASP.NET 2.0) and jQuery 1.2.6 in aspx file : <rms:UserDDL ID="ddlUserTypes" runat="server" PreLoad="true" /> <rms:DDLValidator ID="userTypesVal" ControlToValidate="ddlUserTypes" ErrorMessage="You have not selected a UserType" runat="server" Text="You have not selected a UserType" Display="Dynamic" EnableClientScript="true" /> in validator code behind protected string ScriptBlock { get { string nl = System.Environment.NewLine; return "<script type=\"text/javascript\">" + nl + " function " + ScriptBlockFunctionName + "(ctrl)" + nl + " {" + nl + " alert('Random message'); " + nl + " var selVal = $('#' + ctrl.controltovalidate).val(); " + nl + " alert(selVal);" + nl + " if (selVal === '-1') return false; " + nl + " return false; " + nl + " }" + nl + "</script>"; } } protected override void OnPreRender(EventArgs e) { if (this.DetermineRenderUplevel() && this.EnableClientScript) { Page.ClientScript.RegisterExpandoAttribute(this.ClientID, "evaluationfunction", this.ScriptBlockFunctionName); Page.ClientScript.RegisterClientScriptBlock(GetType(), this.ScriptBlockKey, this.ScriptBlock); } base.OnPreRender(e); } I know my ControlPropertiesValid() and EvaluateIsValid() work ok. I appreciate any help on this issue. Noel.

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  • How to develop a client-server seat booking program via java socket programming ?

    - by Haxed
    I have a project to develop a client server application in java. This is to be done using socket programming. Our lecturer, used 2 files, the TCPClient.java and TCPServer.java, to make a connection and we typed "Hi" in the client and the server displayed that message. I need to develop a seat booking application. Any suggestions for tutorials or tips or a book perhaps would be nice. Many Thanks

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  • Windows Server 2008 DHCP with RRAS

    - by Guillermo Prandi
    I have a Windows Server 2008 R2 which is a member of a domain, but is placed in a remote location. The server is directly connected to Internet. Clients need to access a particular insecure TCP service in this server (ports 9730 and 9731). Since clients have dynamic IP addresses I cannot know in advance, I thought it would be nice to have them connected through a VPN in order to access the insecure service, but ONLY to access that service, like this: Client ------> VPN TUNNEL ------> (Insecure service at Server) | \----> (Normal internet access) I'd enable the insecure ports in the firewall only from VPN accesses. For this I configured RRAS in the server and gave it a static IP address range (172.19.1.2 through 172.19.1.254) to serve the clients. First I thought I could use DHCP to assign the addresses, but I cannot use DHCP in my LAN connection (not allowed by the hosting service). I tried configuring DHCP binding it to a Microsoft Loopback Adapter, but that's not supported as a DHCP source by RRAS. What I want to accomplish is to send specific DHCP options to the client (network mask, routing table, etc.). In particular: Prevent the client from having the server as default router (without changing the client's "use default gateway in remote network"). Have it as a route for the server's internal RRAS address only (172.19.1.1). Prevent the client from using a 255.255.0.0 mask for the 172.19.x.x network (a 255.255.255.0 mask would be better). Can I do that with RRAS only? How? Currently, the only solution I can think of is to use DHCP in the LAN adapter, but filter DHCP packets so they don't reach the provider's network. However, I'm not sure if that will work. Any suggestions are welcomed! Guille

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  • Win Server 2k and Win 7 client

    - by Ray Kruse
    I have a Win Server 2000 system with AD configured. The network consists of an OKI printer, a network server, a wifi router a Win 2k client and the server. I'm trying to connect a Win 7 client. The purpose of the network, besides sharing equipment is to move files from client to client and scatter backups over more than 1 machine. The Win 7 client is configured for DHCP and does in fact receive it's IP and DNS configuration from the server and it sees the printer, wifi router and network drive, but does not see the Win 2k client nor the Win 2k server. I have tried the LAN Management Authentication Level set to 'Send LM & NTLM responses' with the 128 bit encryption removed. I've also done the registry hack on the key 'LmCompatibilityLevel'. Neither of these have helped. I have two questions: Is there a fix or is Win 2k totally incompatible? Is the best (or quickest/cheapest) fix to upgrade the server to Win 2k3 and not worry about the Win 2k client? Thanks for any help. Ray Kruse Buffalo, KY

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  • OpenVPN Keeps Crashing

    - by Frank Thornton
    Oct 20 21:00:44 sb1 openvpn[2082]: <MY_IP>:28523 [vpntest] Peer Connection Initiated with [AF_INET]<MY_IP>:28523 Oct 20 21:00:44 sb1 openvpn[2082]: vpntest/<MY_IP>:28523 MULTI_sva: pool returned IPv4=10.8.0.6, IPv6=(Not enabled) Oct 20 21:00:44 sb1 openvpn[2082]: <MY_IP>:28522 WARNING: 'link-mtu' is used inconsistently, local='link-mtu 1576', remote='link-mtu 1376' Oct 20 21:00:44 sb1 openvpn[2082]: <MY_IP>:28522 WARNING: 'tun-mtu' is used inconsistently, local='tun-mtu 1532', remote='tun-mtu 1332' Oct 20 21:00:45 sb1 openvpn[2082]: <MY_IP>:28522 [vpntest2] Peer Connection Initiated with [AF_INET]<MY_IP>:28522 Oct 20 21:00:45 sb1 openvpn[2082]: vpntest2/<MY_IP>:28522 MULTI_sva: pool returned IPv4=10.8.0.10, IPv6=(Not enabled) Oct 20 21:00:46 sb1 openvpn[2082]: vpntest/<MY_IP>:28523 send_push_reply(): safe_cap=940 Client File: client dev tun proto tcp remote <IP> 443 resolv-retry infinite nobind tun-mtu 1500 tun-mtu-extra 32 mssfix 1410 persist-key persist-tun auth-user-pass comp-lzo SERVER: port 443 #- port proto tcp #- protocol dev tun tun-mtu 1500 tun-mtu-extra 32 reneg-sec 0 #mtu-disc yes mssfix 1410 ca /etc/openvpn/easy-rsa/2.0/keys/ca.crt cert /etc/openvpn/easy-rsa/2.0/keys/server.crt key /etc/openvpn/easy-rsa/2.0/keys/server.key dh /etc/openvpn/easy-rsa/2.0/keys/dh1024.pem plugin /etc/openvpn/openvpn-auth-pam.so /etc/pam.d/login #plugin /usr/share/openvpn/plugin/lib/openvpn-auth-pam.so /etc/pam.d/login #- Comment this line if you are using FreeRADIUS #plugin /etc/openvpn/radiusplugin.so /etc/openvpn/radiusplugin.cnf #- Uncomment this line if you are using FreeRADIUS client-to-client client-cert-not-required username-as-common-name server 10.8.0.0 255.255.255.0 push "redirect-gateway def1" push "dhcp-option DNS 8.8.8.8" push "dhcp-option DNS 8.8.4.4" keepalive 3 30 comp-lzo persist-key persist-tun What is causing the VPN to keep dropping the connection and then reconnecting?

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  • Possible to have different SSLCACertificateFiles under different Location in Apache (client side ssl certs)

    - by Mikko Ohtamaa
    I am setting up Apache to do smartcard authentication. The smartcard login is based on client-side SSL certificates handled by an OS driver. I have currently just one smartcard provider, but in the future there are potentially several of them. I am not sure how Apache 2.2. handles client-side certifications per Location. I did some quick testing and it somehow seemed that only the last SSLCACertificateFile directive would have been effective and this doesn't sound right. Is it possible to have different SSLCACertificateFile per Location in Apache (2.2, 2.4) as described below or is SSL protocol somehow limiting that you cannot have more than one SSLCACertificateFile per IP? Example potential config below how I wish to handle several SSLCACertificateFile on the same server to allow users to log in with different smartcard provides. <VirtualHost 127.0.0.1:443> # Real men use mod_proxy DocumentRoot "/nowhere" ServerName local-apache ServerAdmin [email protected] SSLEngine on SSLOptions +StdEnvVars +ExportCertData # Server-side HTTPS configuration SSLCertificateFile /etc/apache2/certificate-test/server.crt SSLCertificateKeyFile /etc/apache2/certificate-test/server.key # Normal SSL site traffic does not require verify client SSLVerifyClient none SSLVerifyDepth 999 # Provider 1 <Location /@@smartcard-login> SSLVerifyClient require SSLCACertificateFile /etc/apache2/certificate-test/ca.crt # Apache does not natively pass forward headers # created by SSLOptions +StdEnvVars, # so we pass them forward to Python using RequestHeader # from mod_headers RequestHeader set X-Client-DN %{SSL_CLIENT_S_DN}e RequestHeader set X-Client-Verify %{SSL_CLIENT_VERIFY}e </Location> # Provider 2 <Location /@@smartcard-login-provider-2> # For real SSLVerifyClient require SSLCACertificateFile /etc/apache2/certificate-test/provider2.crt # Apache does not natively pass forward headers # created by SSLOptions +StdEnvVars, # so we pass them forward to Python using RequestHeader # from mod_headers RequestHeader set X-Client-DN %{SSL_CLIENT_S_DN}e RequestHeader set X-Client-Verify %{SSL_CLIENT_VERIFY}e </Location> # Connect to Plone ZEO client1 running on fg ProxyPass / http://localhost:8080/VirtualHostBase/https/local-apache:443/folder_sits/sitsngta/VirtualHostRoot/ ProxyPassReverse / http://localhost:8080/VirtualHostBase/https/local-apache:443/folder_sits/sitsngta/VirtualHostRoot/ </VirtualHost>

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