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• setup mtu automatically after system reboot

  - by Gopalakrishnan Subramani

  I have issues with slow internet and by changing mtu works fine for me. I use Ubuntu 9.10 64bit system. I have dynamic ip address setup All the time after system bootup, I need to do the following command to make mtu setting take effect. sudo ifconfig eth0 mtu 1492 Are there any way I can set it up using startup program. As you know, sudo prompt me root password.

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• sendmail redhat

  - by lepricon123

  For some reason even after providing the sender's from adress my mails are not being delivered as from is missing as below maillog. Any suggestions? May 8 20:08:43 tawq02 sendmail[13443]: o4938hJD013443: ruleset=check_mail, arg1=<{}, relay=localhost.localdomain [127.0.0.1], reject=553 5.5.4 <{}... Domain name required for sender address {} May 8 20:08:43 tawq02 sendmail[13443]: o4938hJD013443: from=<{}, size=0, class=0, nrcpts=0, proto=ESMTP, daemon=MTA, relay=localhost.localdomain [127.0.0.1]

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• Windows Server Firewall report

  - by Yves

  Hi, I am trying to get a list of all sites (ips) visited by a computer on the network. Is there a way to ask the Windows firewall to return me a report of all the sites for a specific IP address on the network (domain)? Thanks p.s: Am using Windows Server 2008

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• How do I send traffic to specific IP addresses through VPN and others directly to the internet?

  - by keithwarren7

  I am running Windows 7 and using the Cisco VPN adapter to connect to a private network where I access resources starting with the IP address 172.. My problem is that when connected to the VPN all external traffic is routed through the VPN. I want to set things up so only certain IP addresses go through the VPN and everything else goes out over the local adapter and out to the internet as normal. How?

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• VMWare ESXi virtual machine can contact the gateway but not the DNS server

  - by Nathan Palmer

  I am having a bit of a strange issue. I have a VMWare ESXi server with two virtual machines running on it. They are running just fine and can communicate on the network without a problem. I am now trying to add a third. I am installing Ubuntu 8.04 Server. I assign it a static IP address and it's a fresh installation. Once installed I can ping the gateway but I cannot ping the DNS server. It's on the same network with the other two VMs which are communicating just fine. I have tried to reinstall the operating system but it still fails to connect. Here is /etc/network/interfaces auto eth0 iface eth0 inet static address 192.168.1.23 netmask 255.255.255.0 network 192.168.1.0 broadcast 192.168.1.255 gateway 192.168.1.1 dns-nameservers 208.67.222.222 #opendns dns-search mydomain.com Here is route Destination | Gateway | Genmask | Flags | Metric | Ref | Use | Iface localnet | * | 255.255.255.0 | U | 0 | 0 | 0 | eth0 default | 192.168.1.1 | 0.0.0.0 | UG | 100 | 0 | 0 | eth0 Since I'm running this behind a FortiGate this is what the sniff command gives me when I try to ping 208.67.222.222 arp who-has 192.168.1.1 tell 192.168.1.23 arp reply 192.168.1.1 is-at MAC 192.168.1.23 -> 208.67.222.222: icmp: echo request 192.168.1.23 -> 208.67.222.222: icmp: echo request 192.168.1.23 -> 208.67.222.222: icmp: echo request 192.168.1.23 -> 208.67.222.222: icmp: echo request 192.168.1.23 -> 208.67.222.222: icmp: echo request As you can see it looks like I never get a response. One interesting thing I notice is the arp reply's MAC doesn't look right. I have cleared the FortiGate's ARP cache though and checked the entry and it seems correct. The MAC it lists is the one for the router. However if I ping from a different virtual machine that is also Ubuntu 8.04 with a nearly identical configuration I get this. 192.168.1.22 -> 208.67.222.222: icmp: echo request 208.67.222.222 -> 192.168.1.22: icmp: echo reply 192.168.1.22 -> 208.67.222.222: icmp: echo request 208.67.222.222 -> 192.168.1.22: icmp: echo reply 192.168.1.22 -> 208.67.222.222: icmp: echo request 208.67.222.222 -> 192.168.1.22: icmp: echo reply So, what could I be missing? Thanks.

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• Gmail sends bulk messages sent by postfix to spam - spf, rDNS are set up (headers inside)

  - by snitko

  here are the headers of the blocked messages (actual domain replaced with domain.com, ip address with n.n.n.n and gmail account name with person.account): Delivered-To: [email protected] Received: by 10.216.89.137 with SMTP id c9cs247685wef; Tue, 6 Dec 2011 16:06:37 -0800 (PST) Received: by 10.224.199.134 with SMTP id es6mr14447757qab.2.1323216395590; Tue, 06 Dec 2011 16:06:35 -0800 (PST) Return-Path: <[email protected]> Received: from mail.domain.com (domain.com. [n.n.n.n]) by mx.google.com with ESMTP id b16si7471407qcv.131.2011.12.06.16.06.35; Tue, 06 Dec 2011 16:06:35 -0800 (PST) Received-SPF: pass (google.com: domain of [email protected] designates n.n.n.n as permitted sender) client-ip=n.n.n.n; Authentication-Results: mx.google.com; spf=pass (google.com: domain of [email protected] designates n.n.n.n as permitted sender) [email protected] Received: by mail.domain.com (Postfix, from userid 5001) id 26ADE381E3; Tue, 6 Dec 2011 19:06:35 -0500 (EST) Received: from domain.com (domain.com [127.0.0.1]) by mail.domain.com (Postfix) with ESMTP id 0148638030 for <[email protected]>; Tue, 6 Dec 2011 19:06:31 -0500 (EST) Date: Tue, 06 Dec 2011 19:06:31 -0500 From: DomainApp <[email protected]> Reply-To: [email protected] To: [email protected] Message-ID: <[email protected]> Subject: Roman Snitko says hi Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-No-Spam: True Precedence: bulk List-Unsubscribe: [email protected] Messages go to Spam folder on various gmail accounts, so it's not a coincidence. I followed all gmail guides on sending bulk emails from here https://mail.google.com/support/bin/answer.py?hl=en&answer=81126. I also checked my ip-address here http://www.dnsblcheck.co.uk/ and it's NOT on the blacklists. Thus I have two questions: What may be the possible reason for the messages to go to Spam folder? Is there any way to contact Google and ask them what causes this? Update: I have set up openDKIM on my server, everything works, gmail message headers say that dkim=pass, which means everything is set up correctly. Messages still end up in Spam folder.

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• When does ISC dhcpd expire leases

  - by Joachim Breitner

  When exactly does ISC dhcpd forget a lease that is not explicitly freed by the client? Context: I am running an installation with many small pools (3 address) and it does not seem to cope well when all three leases are taken. Nevertheless I see entries in dhcpd.leases-file whose end date has passed. Also, these entries are counted towards the number of used leases for the adaptive lease time feature. Shouldn’t these be considered unused?

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• Possible to direct naked domain to external IP

  - by Luke

  So I found this post: configure Bind to have a custom domain on tumblr and I was trying to ask a related question: Would it be possible to set up an A record pointing traffic to domain.com to Tumblr and feed.domain.com to the IP address of my choice? In other words, by setting up a naked domain A record to Tumblr's IP, will I inherently lose traffic to feed.domain.com? Can I write another A record for the specific subdomains I want to point to my server? I hope this makes sense.

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• Free FTP Virtual Drive Software for Windows (if not on Linux)

  - by asksuperuser

  Is there something equivalent to WebDrive but free or open source ? Update: I want on Windows if possible and be able to save a file on a virtual ftp drive from any software. I know already I can type "ftp://[email protected]" into an Explorer address as suggested below but that doesn't transform it into a true virtual drive as i cannot save file from notepad for example.

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• Cannot browse network shares in Windows Explorer, but paths are still accessible

  - by Jeff Lockhart

  Windows Explorer has somehow corrupted itself and I'm not sure how to fix this problem. My Windows installation has been in use for a few years with network shares setup and working. Recently, I noticed that a program that I use to save network share paths to a database was no longer opening the explorer window to browse the path. It usually opens to the last path saved, but now it was just not opening at all. When I go to Windows Explorer to browse the network share directly, I get the error \\SERVER is not accessible. You might not have permission to use this network resource. Contact the administrator of this server to find out if you have access permissions. The specified network provider name is invalid. The network shares are just shares on the server itself (once saved to the database, they're used on the server as well as clients to reach files). The strange thing is, the files are still accessible from the program that uses them if I type the network share path in manually. So it is only a problem with Windows Explorer browsing the path. The reason I think there is some sort of configuration or setting, possibly in the registry, corrupted is that when the problem first manifest itself, I was somehow able to open an explorer window to a network share path, but the breadcrumb in the address bar did not function properly. It duplicated the share name folder at the top of the breadcrumb stack and when I clicked the second of the duplicated share folder, it crashed explorer.exe. I haven't been able to browse any network share path since this happened. I have tried using the IP address directly \\192.168.1.# as well as \\localhost and neither of those work either. I have tried running sfc /scannow and it did not find any errors. I tried ipconfig /flushdns and this made no difference. Attempting to map the network share to a drive fails using either the explorer GUI or net use command. Is there some way to reset Windows Explorer somehow to resolve this? I'd really like to avoid reinstalling Windows entirely if I can.

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• “X_FORWARDED_FOR” Header Doesn't Present In The Request

  - by Radi

  In my web application I need to extract the real ip address for clients behind proxy, after searching I found that the possible method to do that is to read the content of "X_FORWARDED_FOR" header , I am using java servlet and the headers of the incoming request doesn't contain "X_FORWARDED_FOR" header , So why the header doesn't included in the request? I am using java 1.7 , tomcat v7 , proxy server :TMG and configured to use "X_FORWARDED_FOR" header . Please advice. Thanks in advance.

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• sendmail on ubuntu (9.10) machine "stopped" sending mail

  - by Doron

  I'm developing on my ubuntu 9.10 machine for the web (php). I'm using it sendmail for sending mails, and while developing on my local machine, I send local mails (to my user 'doron'). Up until a few days ago, I was able to send mails both from php's mail() function, and from the command line using the mail command. I'm using sendmail with mailutils. Since the last few days, it seems like it stopped working. When I try to send mail from the command line, I get the following in my syslog (and mail.info, and mail.log): Mar 3 13:27:58 doron-desktop sendmail[4693]: o23BRwlA004693: from=doron, size=84, class=0, nrcpts=1, msgid=<201003031127.o23BRwlA004693@doron-desktop.>, relay=doron@localhost Mar 3 13:27:58 doron-desktop sm-mta[4694]: o23BRwtQ004694: ruleset=check_rcpt, arg1=<doron@doron-desktop>, relay=localhost [127.0.0.1], reject=553 5.1.8 <doron@doron-desktop>... Domain of sender address doron@doron-desktop does not exist Mar 3 13:27:58 doron-desktop sendmail[4693]: o23BRwlA004693: to=<doron@doron-desktop>, ctladdr=doron (1000/1000), delay=00:00:00, xdelay=00:00:00, mailer=relay, pri=30084, relay=[127.0.0.1] [127.0.0.1], dsn=5.1.8, stat=User unknown Mar 3 13:27:58 doron-desktop sm-mta[4694]: o23BRwtQ004694: from=<doron@doron-desktop>, size=84, class=0, nrcpts=0, proto=ESMTP, daemon=MTA-v4, relay=localhost [127.0.0.1] Trying to telnet locally to port 25 results in the following (same output for doron@doron-desktop): doron@doron-desktop:/var/mail$ telnet localhost 25 Trying ::1... Trying 127.0.0.1... Connected to localhost. Escape character is '^]'. 220 doron-desktop. ESMTP Sendmail 8.14.3/8.14.3/Debian-9ubuntu1; Wed, 3 Mar 2010 13:26:06 +0200; (No UCE/UBE) logging access from: localhost(OK)-localhost [127.0.0.1] helo localhost 250 doron-desktop. Hello localhost [127.0.0.1], pleased to meet you mail from: doron@localhost 250 2.1.0 doron@localhost... Sender ok rcpt to: root@localhost 553 5.1.8 root@localhost... Domain of sender address doron@doron-desktop does not exist However - if I do the same, but use [email protected] in the mail from field, I get: 250 2.1.5 root... Recipient ok My /etc/hosts file: 127.0.0.1 localhost 127.0.1.1 doron-desktop doron-desktop. (If I don't have the "doron-desktop." (with the ending dot), the mail command takes a lot of time (around 30 seconds) until it responds, but the results are the same.)

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• Error Trying To Use Microsoft LifeCam VX-3000

  - by Brian

  Hello, I bought a Microsoft LifeCam VX-3000 web camera for may parent's Dell Dimension 3000 computer running XP SP 3, and I cannot get it to run. THe installation ran successfully, but when I try to run it, I get the error: Faulting application lifecam.exe, version 3.21.263.0, faulting module kernel32.dll, version 5.1.2600.5781, fault address 0x00012afb. The microsoft help link really didn't help... how do I even resolve this type of error? Thanks.

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• Snapback in Firefox

  - by Casebash

  In my address bar, on the left of the star, there is an option Snapback: [Empty] for every site. I haven't seen this before and I don't have the Snapback plugin. Doesn't anyone know where it may have come from and what it does? I recently upgraded to 3.5.6 on Ubuntu, and may have had some plugins upgraded, but not sure which. I have a ridiculous number of plugins on this comp otherwise I could just try disabling them one at a time.

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• How do I connect to MySQL when it's setting behind 2 layers of ssh?

  - by David Corley

  I have a MySQL server sitting behind a bastion server that I wish to connect to from my local machine. Ideally I want to port-forward the MySQL port (3316 in this case) to a local port on my machine. I've tried plink -ssh -L 3306:my.sql.ip.address:3316 my.bastion.server ,but this is not working. I've got one ssh login for the bastion server and another login for the machine mysql server is running on.

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• Protecting DNS entries from duplicate hostnames entering network

  - by Aszurom

  Given a Windows domain, with DNS provided by a server on that domain, I am curious about what happens if a guest joins the network attempting to use the same hostname as an existing server, and then tries to register that hostname in DNS with its DHCP address. Can this potentially be disruptive to the server, or is Windows DNS smart enough to spot a duplicate hostname and deny an auto-register request from that host? What actions can be taken to ensure that DNS for a hostname cannot be altered?

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• DNS Change replication time

  - by Lukes123

  We have just changed our DNS record to point to a new server running IIS. How long will it take until the address is changed to the new server? Some people can still see the old server and some can see the new. I have flushed the dns on my pc and it seems to be fine although it doesn't with another of my pcs. Thanks

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• WSS and CAG , _layout pages break

  - by Mike

  Alright, I've searched everywhere and I cannot find the answer, due to the rarity of our setup. WSS 3.0/IIS 6.0/WinServer 2003 We have a sharepoint site that is in good shape, almost. Its TCP and SSL port are uncommon and need to be rerouted to work properly. This is where the Citrix Access Gateway (CAG) comes in play. It will redirect any request from URL (something.something.com) to the correct SSL port on the correct server. My AAM is configured to Default something.something.com and nothing else, since the CAG will provide the port. We use FBA, and require SSL. This works perfectly for everything that is safe or that is anything that an end user can see, but if I try to add a webpart, it errors out. Whereas if I add it internally, or bypass the CAG the webpart adds fine. The same goes for most of the _layouts pages, like _layouts/new.aspx. If I add a Link List/Doc library on the something.something.com, it errors out (Page cannot be displayed) and the page won't display, but if I try it with an internal address it will work fine. I found that if I am trying to add something or doing anything administrative, the site will navigate to the pages that I need to go to fine, but when i actually ADD something the URL will change from something.something.com to something.something.com:SSLport, thus erroring out the site. The URL with the SSL port shows on the Site URL when navigating to Site Settings. However, if I bypass the CAG, using the internal address the _layouts page works like a charm and i can add anything. All the CAG does is reroute a DNS request to the provided server and port. I've tried reextending the application, no luck same thing. I've tried changing the AAM to hide the port and the CAG rejects it. I've tried to recreate a new webapp/site collection with the same rules on the CAG, same thing occurs. Correct me if I'm wrong, and please provide me with some feedback and answers. Any suggestions would be very appreciated. Is it the CAG or the Alternate Access Mappings (AAM)?

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• networking tunnel adapter connections?

  - by Karthik Balaguru

  I understand that Tunnel Adapter LAN is for encapsulating IPv6 packets with an IPv4 header so that they can be sent across an IPv4 network. Few queries popped up in my mind based on this :- If i do 'ipconfig', Apart from ethernet adapter LAN details, I get a series of statments as below - Tunnel adapter Local Area Connection* 6 Tunnel adapter Local Area Connection* 7 Tunnel adapter Local Area Connection* 12 Tunnel adapter Local Area Connection* 13 Tunnel adapter Local Area Connection* 14 Tunnel adapter Local Area Connection* 15 Tunnel adapter Local Area Connection* 16 Except for the *16, all the other Tunnel Adapter Local Area Connections show Media Disconnected. Why is the numbering for the Tunnel adapter LAN not sequential? It is like 6, 7, 12, 13, 14, 15, 16. A strange numbering scheme! I tried to figure it out by thinking of some arithmetic series. But, it does not seem to fit in. There is a huge gap between 7 and 12. Any ideas? What is the need for so many Tunnel Adapter LAN connections? Can you tell me a scenario that requires all of those ? I did ipconfig /all to get more information. From the listing, I understand that: 16, 15, 14, 12 are Microsoft 6to4 Adapters 13, 6 are isatap Adapters 7 is Teredo Tunneling Pseudo-interface I understand that the above are for automatic tunneling so that the tunnel endpoints are determined automatically by the routing infrastructure. 6to4 is recommended by RFC3056 for automatic tunneling that uses protocol 41 for encapsulation. It is typically used when an end-user wants to connect to the IPv6 Internet using their existing IPv4 connection. Teredo is an automatic tunneling technique that uses UDP encapsulation across multiple NATs. That is, It is to grant IPv6 connectivity to nodes that are located behind IPv6-unaware NAT devices ISATAP treats the IPv4 network as a virtual IPv6 local link, with mappings from each IPv4 address to a link-local IPv6 address. That is to transmit IPv6 packets between dual-stack nodes on top of an IPv4 network. That is, to put in simple words, ISATAP is an intra-site mechanism, while the 6to4 and Teredo are for inter-site tunnelling mechanisms. It seems that Teredo should alone enabled by default in Vista, But my system does not show it to be enabled by default. Interestingly, it shows a 6to4 tunnel adapter (Tunnel adapter LAN connection 16) to be enabled by default? Any specific reasons for it? If i do ipconfig /all, why is only one Teredo present while four 6to4 are present ? I searched the internet for answers to the above queries, but I am unable to find clear answers.

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• Dynamically set current domain in nginx with perl module

  - by Simone Margaritelli

  i know how to set variables and use subroutines with the nginx builtin perl module INSIDE a "server" directive but, what i need to do is to set/rewrite the current domain before ... let's say, we have a domain like admin.foobar.website.com i want that a request to foobar.othersite.com points to the first address ( obviously website.com and othersite.com are hosted on the same webserver running nginx :) ). For reasons i can't explain here, i can not use multiple server_name directive expressions, i have to do this before the server {} block, with perl or anyway possible. Thanks

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• How do I restart MySQL in monit when page contains specific text?

  - by Tyler

  How do I check if a web page contains the text "Error connecting to database" and if the text exists in the page restart the database? Here's what I have so far but it isn't working: check host website.com with address website.com group database start program = "/usr/bin/service mysql start" stop program = "/usr/bin/service mysql stop" if url http://website.com content == "Error connecting to database" then restart

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• Tomcat 6 going down after reaching its maximum number of threads

  - by user73628

  Our Tomcat 6.0.29 goes down after reaching its maximum number of Threads. I would really appreciate any help with it because it is a production server. Here is part of the catalina.log file: INFO: Maximum number of threads (600) created for connector with address null and port 80 Mar 8, 2011 11:19:37 AM org.apache.coyote.http11.Http11Protocol pause INFO: Pausing Coyote HTTP/1.1 on http-80 Mar 8, 2011 11:19:38 AM org.apache.catalina.core.StandardService stop INFO: Stopping service Catalina Mar 8, 2011 11:19:38 AM org.apache.catalina.core.StandardWrapper unload INFO: Waiting for 8 instance(s) to be deallocated

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• How to ping virtualbox guest machine by hostname? [migrated]

  - by Punit Soni

  Here is the summary. VirtualBox 4.2.18 Host OS: Windows 7 Guest OS: Ubuntu 12.04 Networking: Bridged Adaptor I can ping Host and other machines in host's network from ubuntu guest using hostnames. But, I can only ping the guest machine using IP address from host and network machines. I have avahi-daemon running on Guest OS. I want to be able to ping/ssh the guest machine from host and other machines on network using hostname of the guest machine. Please help.

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• What are the limitations of Upgrade Advisor when upgrading from sql2000 to 2005

  - by kareemsaad

  How well does upgrade advisor work for doing SQL Server 2000-2005 upgrades - what are the significant gaps that I might have to address through other means?

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• Configuring Windows 2003 As A Router

  - by Sean M

  I am trying to configure a Windows 2003 server to act as a router, so that the two subnetworks that I'm dealing with can communicate with one another without NAT. I am mostly sure that I have configured Windows 2003 incorrectly, and I'm finding it very difficult to drill down through Google results to something helpful. I have a 192.168.1.0/24 network that is my "production" network (in the sense that I'm in trouble if I screw it up) and a 10.0.0.0/8 network that is my test network. The 192.168.1.0 network is ruled by a gateway whose routing table looks like this (my address redacted): The Windows 2003 server, "prime," is multihomed. Its network adapters are at 192.168.1.122, (as seen above), 10.0.0.1, and 10.0.0.2. I added the Routing and Remote Access role to it, and enabled LAN routing. I do not have it using RIP or other routing protocols. Its current routing table is shown below. To me, it looks like all of the right routes are there for traffic to pass between the 192.168.1.0 network and the 10.0.0.0 network. However, traffic does not pass. The 10.0.0.11 and .12 clients cannot be contacted from the 192.168.1.0 network. When I use traceroute to try to get to them, the trace gets to the Windows 2003 server's 192.168.1.122 address, then produces nothing but "* * *" timeouts. When I try to traceroute to 192.168.1.1 from a 10.0.0.0-network client, I get "destination host unreachable." However, I know that the routing is working at least a little, because from the 192.168.1.0 network, I can connect to the Windows server just fine by referring to it as 10.0.0.1. What static routes would allow me to contact 10.0.0.11 and .12 from the 192.168.1.0 network? Is it possible to tell the Windows server "since you are a DHCP/DNS server, you already know routes to get to machines that are getting IP addresses from you, please add those to your routing table" ? Will using RIP or OSPF on the Windows server actually be helpful in this situation?

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