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  • ASA DHCP Relay configuration..

    - by Jeff
    I have locations in different cities, connected using 2 Cisco ASA devices. my main location, corporate, use the IP 192.168.1.x The second location, remote store, use the IP 192.168.3.x I have a DHCP server (192.168.1.254) at my corporate location. I have created a scope for the 192.168.1.x which works fine for the corporate location. I created a scope for the remote location (192.168.3.x) on my DHCP server and tried to configure the remote ASA DCHP Relay, on the remote ASA: I disabled the DHCP Server on the inside. I enabled DHCP Relay on the inside, with set route set at yes. I set the Global DHCP Relay Servers, specify up to four servers to which DHCP requests would be relayed. I added my DHCP, 192.168.1.254 I flashed these settings to the ASA and gave it a try, didn't do anything. am i missing something - forgetting something. not really sure what im doing wrong. DHCP Settings on remote ASA: dhcp-client update dns server both dhcpd dns 192.168.1.254 dhcpd ping_timeout 750 dhcpd domain JEWELS.LOCAL dhcpd auto_config outside dhcpd update dns both ! dhcpd address 192.168.3.2-192.168.3.33 inside ! dhcprelay server 192.168.1.254 outside dhcprelay enable inside dhcprelay setroute inside on my local ASA: i have two ACLs for UDP ports 67 and 68 permitting any inbound traffic from the remote locations IP ... dhcprelay timeout 120

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  • 550 Forged HELO with postfix on debian lenny

    - by Martin Ahrer
    I'm running postfix on a debian lenny system. sending mail in general works without any problems. however some recipent mail systems return an error and I can't get a clue what is causing the problem. So far I suspect that this is either postfix setup itself or the reverse dns resolution. The mail server is running on a virtual server from my service provider. running the command hostname is returning my.domain however running host <ip-address> is returning some alias from the virtual server system. now i'm not quite sure if that is causing my problem???? The mail system <recipient-mail>: host mx0.recipient.domain[xxx.xxx.xxx.xxx] refused to talk to me: 550 Forged HELO: you are not my.domain Reporting-MTA: dns; my.domain X-Postfix-Queue-ID: 6A1135B08002 X-Postfix-Sender: rfc822; [email protected] Arrival-Date: Tue, 13 Apr 2010 17:50:36 +0200 (CEST) Final-Recipient: rfc822; recipient-mail Action: failed Status: 5.0.0 Remote-MTA: dns; mx0.recipient.domain Diagnostic-Code: smtp; 550 Forged HELO: you are not my.domain

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  • Windows Server 2008 R2, weird intermittent outgoing connection issues, & Hyper-V Virtual Network

    - by brizz
    My provider says that they run an 'unfiltered' network, so it's not a network issue. Not entirely convinced...but they aren't being very helpful. Basically two days ago started having issues with DNS completely stop working for anywhere between 2-20minutes. This happens roughly every 1-2 hours at least once. I later then found that I am unable to ping ANY external IP address when this is going on. So it's not a DNS issue. Whats even more odd is when this is going on, I STAY connected via RDP, and I can access webpages, etc that are on the server when I access from my home computer. Have tried disabling the firewall--no fix. Have checked Event viewer, the only thing that is there is a warning that DNS has stopped working. I have made no changes/updates to the server. The only thing I have done is add an IP address (don't think it has anything to do with the problem, but wanted to mention everything). Any help/insight/suggestions on how to go about debugging would be much appreciated! update: I am also running Hyper-V, and a virtual network. I just tried pinging (when I have issues), from a Hyper-V machine--and it works, when the main server doesn't.

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  • Debian Linux bridging router intermittently dropping packets [migrated]

    - by nomen
    My old Asus router died a few weeks ago, so I thought I'd set up my Debian box to deal with routing my home network. I have a few complications, but I adapted my configuration from a previously working configuration, and I don't see why I am having intermittent problems. But I am having them! Every so often, my SSH connections to the router (and to the Xen virtual machines hosted by the router) just drop. I am unable to use the router's dns server. I can't ping the router. Etc. (I can provide more details, but I'm not sure what will be helpful) /etc/network/interfaces: # The loopback network interface auto lo iface lo inet loopback # Gigabit ethernet, internal network auto eth0 allow-hotplug eth0 iface eth0 inet manual # USB ethernet, internet auto eth1 allow-hotplug eth1 iface eth1 inet dhcp # Xen Bridge auto xlan0 iface xlan0 inet static bridge_ports eth0 address 10.47.94.1 netmask 255.255.255.0 As I understand it, this is sufficient to create the network interfaces, and even do some switching between Xen hosts and my eth0 interface. I installed and configured Shorewall to manage routing: /etc/shorewall/zones fw firewall net ipv4 lan ipv4 /etc/shorewall/interfaces net eth1 detect dhcp,tcpflags,nosmurfs,routefilter,logmartians lan xlan0 detect dhcp,tcpflags,nosmurfs,routefilter,logmartians,routeback,bridge /etc/shorewall/policy net all DROP info fw net ACCEPT info all all REJECT info /etc/shorewall/rules DNS(ACCEPT) fw net DNS(ACCEPT) lan fw ... and so on, these all work, when the router is accepting traffic at all. /etc/shorewall/masq eth1 10.47.94.0/24 Can anybody help?

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  • Instant connection to wireless network but delayed internet access on Mediacom with Windows 7

    - by David
    I have Mediacom cable internet and their provided modem/wireless router a Cisco DPC3825. Each of the laptops experiencing the trouble have Windows 7 64-bit. When connecting to the wireless network each computer will take a second or two to connect and then toggle from "no internet access" to "internet access" however, no websites are accessible for about five minutes after connecting. After that, there aren't any problems. It happens on all 3 of the laptops I have available and none of them have problems on any other network. It seems like my phone doesn't have the delay issue when it connects. I've power cycled the modem/router along with a DNS flush. I have some of the DNS servers manually set to Google DNS addresses and one just default. I've contacted and had Mediacom support try all its tricks. They changed the SSID and password along with resetting the thing remotely a handful of times. It was installed just this month and seemed to pass the tech's checks upon installation. Nothing in the settings has been changed, but it's been exhibiting this problem from the get go. This guy seems to be having the same problem, but no solution was posted. http://www.dslreports.com/forum/r27372861-IA-Connection-to-Mediacom-wireless-Modem-no-internet- Help greatly appreciated.

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  • vmware vcenter 5.1 installation with FQDN error

    - by CSG
    I'm trying to install vCenter 5.1 on a windows 2012 dedicated (with SQL express standalone) During the installation of the Single Sign On module i've a warning "the fully qualified domain name cannot be resolved with nslookup. if you continue the installation some features might not work correctly. for detailed requiments see the installation and setup guide" The only indication that i've found are about the reverse zone dns resolution.. and this works! i've verified that the dns works properly with nslookup C:\Users\admin>nslookup srv6.mydomain.local Server: srv2.mydomain.local Address: 172.25.4.22 Nome: srv6.mydomain.local Address: 172.25.1.26 C:\Users\admin>nslookup 172.25.1.26 Server: srv2.mydomain.local Address: 172.25.4.22 Nome: srv6.mydomain.local Address: 172.25.1.26 (all ip are right: I've the vCenter=srv6 and DC+DNS=srv2 on different vlan) i've tryed to force the resolution of the ip changing the [..]\drivers\etc\hosts file i've disabled the IPv6 support i've used all combination with domain prefixes (explicit, by dhcp, undefined..) i've disabled all antivirus/firewall (kaspersky end point 10) is this a bug of vcenter 5.1.0-1065152 ? have you got any suggestions for me?

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  • Kerberos & localhost

    - by Alex Leach
    I've got a Kerberos v5 server set up on a Linux machine, and it's working very well when connecting to other hosts (using samba, ldap or ssh), for which there are principals in my kerberos database. Can I use kerberos to authenticate against localhost though? And if I can, are there reasons why I shouldn't? I haven't made a kerberos principal for localhost. I don't think I should; instead I think the principal should resolve to the machine's full hostname. Is that possible? I'd ideally like a way to configure this on just one server (whether kerberos, DNS, or ssh), but if each machine needs some custom configuration, that'd work too. e.g $ ssh -v localhost ... debug1: Unspecified GSS failure. Minor code may provide more information Server host/[email protected] not found in Kerberos database ... EDIT: So I had a bad /etc/hosts file. If I remember correctly, the original version I got with Ubuntu had two 127.0. IP addresses, something like:- 127.0.0.1 localhost 127.0.*1*.1 hostname For no good reason, I'd changed mine a long time ago to: 127.0.0.1 localhost 127.0.*0*.1 hostname.example.com hostname This seemed to work fine with everything until I tried out ssh with kerberos (a recent endeavour). Somehow this configuration led to sshd resolving the machine's kerberos principal to "host/localhost@\n", which I suppose makes sense if it uses /etc/hosts for forward and reverse dns lookups in preference to external dns. So I commented out the latter line, and sshd magically started authenticating with gssapi-with-mic. Awesome. (Then I investigated localhost and asked the question)

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  • Server 2008 NAT Internet Not Working

    - by Jack
    I'm trying to set up Routing and Remote Access on Windows Server 2008 R2, I have a network connection that I want to share the internet from to another private network. The server has two NICs which are configured as follows: External NIC (Dynamically assigned by ISP) IP:10.175.4.150 Subnet:255.255.192.0 Gateway:10.175.0.1 DNS:10.175.0.1 Internal NIC IP:172.16.254.1 Subnet:255.255.255.0 Gateway:None DNS:None I have set the external NIC to be the public interface and enabled NAT on it in the RRAS MMC and set the internal NIC to be a private interface. I have also set up the DNS forwarding or whatever it is in the NAT section. From a client (IP:172.16.254.2) I can ping the server and access files on it, when I try to browse the web with the default gateway set to the internal NIC ip I end up getting a 404 page which is returned from the ISPs default gateway. I'm guessing it's something to do with the double NAT possibly. Trying to ping the ISPs default gateway from a private network client just times out as does accessing it directly. I've disabled and reconfigured RRAS multiple times and that doesn't seem to have made a difference, so can anyone tell me what I'm doing wrong? Thanks.

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  • OpenVPN connected but not internet access on the client

    - by Stefan
    I've setup OpenVPN following this tutorial, and everything works fine except that I don't have an internet connection on the client while connected to VPN. http://www.howtoforge.com/internet-and-lan-over-vpn-using-openvpn-linux-server-windows-linux-clients-works-for-gaming-and-through-firewalls My VPS server config is as follows (Ubuntu): dev tun proto udp port 1194 ca /etc/openvpn/easy-rsa/keys/ca.crt cert /etc/openvpn/easy-rsa/keys/server.crt key /etc/openvpn/easy-rsa/keys/server.key dh /etc/openvpn/easy-rsa/keys/dh1024.pem user nobody group nogroup server 10.8.0.0 255.255.255.0 persist-key persist-tun status /var/log/openvpn-status.log verb 3 client-to-client push "redirect-gateway local def1" #set the dns servers push "dhcp-option DNS 8.8.8.8" push "dhcp-option DNS 8.8.4.4" log-append /var/log/openvpn comp-lzo plugin /usr/lib/openvpn/openvpn-auth-pam.so common-auth My client config is as follows (Windows 7): dev tun client proto udp remote XXX.XXX.XXX.XXX 1194 resolv-retry infinite nobind persist-key persist-tun ca ca.crt cert stefan.crt key stefan.key comp-lzo verb 3 auth-user-pass redirect-gateway local def1 I've turned off the firewall on the server for testing purposes (it doesn't help), and tried both wired and wireless connecting on the client. I've tried many Google results... but nothing seems to help. Can you help me? Thanks so far...

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  • Name resolution not working with ipv6 on centos

    - by jolivier
    I just installed CentOs 6.3 on a server to be installed in a data center, but cannot get name resolution / curl to work. I know this is because of it trying to use ipv6, since ping google.com works, curl -4 google.com works, but not curl google.com. I removed the ipv6 adress from the interface and it does not change anything. This is very problematic since most system tools like yum fail at name resolution currently. Browsers like Firefox work because they might be using another tool for name resolution than the one use by curl. I managed to fix this on workstations by completely disabling ipv6 following tutorials like this one / hardcoding name resolution in /etc/hosts. But since I am here configuring a server which will be later installed in a remote data center, I would like not to mess up, understand what is going on and fix it properly. Besides, I will face the same issue with more servers to come so I would really appreciate your help in understanding this problem and how to solve it. I would be happy to provide more information if needed to help understand what is going on. The current network configuration is a small enterprise network, with a DNS server (let's call it A) configured once a long time ago. dig google.com and dig -4 google.com are both refused by the A DNS. But this is also true for my workstation on which curl is working (and yes they both use the same A DNS server). Indeed this faulty server and my workstation have multiple nameservers in /etc/resolv.conf, and the second one is working fine for both of them, so if I remove A from my resolv.conf everything works fine! Regards, Olivier

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  • Error 550 Mail Relay Message Could Not Be Sent

    - by mraliks
    I'm not sure if this is the right area to ask, but here we go. I have a client who has a couple websites on a Windows server with MailEnable as the mail manager. Any emails being sent from the server work great, except when sending to some domains, the message does not go through due to the following error: 12/13/11 01:15:56 ME-I0026: [86476200E5834227A819E6E63E0EFDA2.MAI] Sending message 12/13/11 01:15:57 ME-IXXXX: [86476200E5834227A819E6E63E0EFDA2.MAI] Remote server returned a response indicating a permanent error. Server Response: (550 Relaying not allowed**) 12/13/11 01:15:57 ME-E0036: [86476200E5834227A819E6E63E0EFDA2.MAI] MAIL FROM command Failed. Can anyone give me some leads on how to correct the settings to allow emails to go through properly? In particular, the emails are not going through to a Network Solutions email account and Network Solutions has not been very helpful thus far. In addition, can a domain's DNS settings affect this error? Currently, the domains are hosted by Network Solutions and use the Network Solutions email service to send/receive email. The server is located with a different company and the Domains' DNS points to it. Which mail related DNS entries are allowed or not allowed in this scenario? Thanks

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  • LYNC / OCS... problems getting edge server working.

    - by TomTom
    New setup Lync 2010 (i.e. OCS 2010). I have serious problems getting my edge system going. Internally things work fine. Externally I am stuck. I have used the tester at https://www.testocsconnectivity.com/ and it also fails. NOTE: I use the domain xample.com / xample.local here just as example. Here is the setup. I have 2 internal hosts (lync.xample.local, edge.xample.local). edge.xample.com is also correctly in dns. and points to the edge.xample.local external assigned ip address (external interface). Externally, I have the following dns entries: edge.xample.com _sip._tcp - edge.xample.com 443 _sipfederationtls._tcp - edge.xample.com 5061 _sipinternaltls._tcp - lync.xample.local 5061 _sip._tls - edge.xample.com 443 My problem is that the ocs connection test always ends up trying to contact lync.xample.local (i.e. the internal address) when connecting to [email protected]. The error is: Attempting to Resolve the host name lync.xample.local in DNS. This shows me it clearly manages to connect to SOMETHING, but it does either fall through to the _sipinternaltls._tcp entry, OR it does get that internal entry wrongly from the edge system. Am I missing some entries or have some wrong?

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  • Dynamic ARP Entries turning into Static ARP entries

    - by Zach
    I recently acquired a client that has a strange ARP caching issue on one of thier servers. I have a server that will eventually start turning it's dynamic ARP entries into static ARP entries. This causes problems because when the machine that has a static ARP entries on this server receives a new IP via DHCP, then the server is not able to communicate with the clients. Clearing the ARP cache resolves the issue and the server is fine for about a week and then it starts slowly turning ARP entries into static ARP entries. I haven't narrowed it down to when or how many it starts to do, but slowly you start seeing 1 static ARP and then 5 and then 10. The server in question is a Windows Server 2003 SP2. It is a DC, DHCP, and DNS server. I've checked the DHCP scope options and there's nothing in there that would indicate anything to do with static ARP entries. The only thing different between this DNS server and our other DNS server is that the 'Dynamically Update DNA A and PTR records for DHCP clients that do not request updates' is checked on the problematic server. I've done a bit of research about this and it seems that this may happen if any PXE type services are running, from what I can tell, there is nothing running a PXE server. I'm a bit lost as I have never seen dynamic ARP entries start to turn into static ARP entries. Right now my solution is a schedule task that runs every 24 hours to clear the ARP cache (arp -d *). I would like to not rely on this schedule task. Has anybody seen this before or have any suggestions on how to troubleshoot this?

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  • Migrateing to Windows Server 2008 R2 Domain Controllers - a few Questions/Issues

    - by Chris
    Ok so here's our setup: We have 2 Windows2k3 Domain Controllers. I am trying to replace them with Windows 2008 R2. The Win2k3 servers are DC01 and DC02. The Windows2k8 servers are DC1 and DC2. I prepared the Windows Server 2003 Forest Schema for a Domain Controller That Runs Windows Server 2008 or Windows Server 2008 R2. Then with both of the new servers up as member servers I dcpromo'd DC1 using the advanced option and added it successfully to my exisiting domain. Roles are GC, DNS and Active Directory Domain Services.I transferred The PDC, RID pool manager and Infrastructure master FSMO to the new DC.(DC1) The Schema master and Domain naming master are still on the old DC (DC01). The first issue I'm encountering is when i dcpromo the second DC (DC2) and select "Replicate data over the network from and existing domain controller" I select the new DC to replicate from (DC1) I get the following error: "Failed to identify the requested replica partner (dc1.xxx.org) as a valid domain controller with a machine account for (DC2$). This is likely due to either the machine account not being replicated to this domain controller because of replication latency or the domain controller not advertising the Active Directory Domain Services. Please consider retrying the operation with \dc01.xxx.org as the replica partner. "The server is unwilling to process the request." Is this because the Schema master and Domain naming master roles are still on the old DC (DC01)? And if so, if I transfer Schema master and Domain naming master roles to DC1 what is the risk or breaking my AD? I'm a little paranoid because this process HAS to be transparent. ANY down time or interruption will result in me getting a verbal ass kicking from my I.T. Director. Both of the new servers DNS point the the old DNS servers (DC01 and DC02) not themselves by the way. Thanks in Advance -Chris

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  • how to define service runlevel order position?

    - by DmitrySemenov
    I setup bind-dlz and need mysql start prior NAMED when system starts here is what I have [root@semenov]# ./test.sh mysql 0:off 1:off 2:on 3:on 4:on 5:on 6:off named 0:off 1:off 2:off 3:on 4:on 5:on 6:off lrwxrwxrwx. 1 root root 15 Apr 15 18:57 /etc/rc3.d/S93mysql -> ../init.d/mysql lrwxrwxrwx. 1 root root 15 Apr 15 18:57 /etc/rc3.d/S90named -> ../init.d/named here is what I have in mysql init script # Comments to support chkconfig on RedHat Linux # chkconfig: 2345 84 16 # description: A very fast and reliable SQL database engine. # Comments to support LSB init script conventions ### BEGIN INIT INFO # Provides: mysql # Required-Start: $local_fs $network $remote_fs # Should-Start: ypbind nscd ldap ntpd xntpd # Required-Stop: $local_fs $network $remote_fs # Default-Start: 2 3 4 5 # Default-Stop: 0 1 6 # Short-Description: start and stop MySQL # Description: MySQL is a very fast and reliable SQL database engine. ### END INIT INFO so when I remove named from chkconfig and have there just mysql, it starts with order number 84: /etc/rc3.d/S84mysql - ../init.d/mysql but when I add named inside chkconfig it's order changes to 93: /etc/rc3.d/S93mysql - ../init.d/mysql as a result mysql will be starting after named and named will fail (no sql available) any ideas what I'm doing wrong? here is what I have in named init script # chkconfig: 345 90 16 # description: named (BIND) is a Domain Name Server (DNS) \ # that is used to resolve host names to IP addresses. # probe: true ### BEGIN INIT INFO # Provides: $named # Required-Start: $local_fs $network $syslog # Required-Stop: $local_fs $network $syslog # Default-Start:2 3 4 # Default-Stop: 0 1 2 3 4 5 6 # Short-Description: start|stop|status|restart|try-restart|reload|force-reload DNS server # Description: control ISC BIND implementation of DNS server ### END INIT INFO thanks, Dmitry

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  • Creating Active Directory on an EC2 box

    - by Chiggins
    So I have Active Directory set up on a Windows Server 2008 Amazon EC2 server. Its set up correctly I think, I never got any errors with it. Just to test that I got it all set up correctly, I have a Windows 7 Professional virtual machine set up on my network to join to AD. I set the VM to use the Active Directory box as its DNS server. I type in my domain to join it, but I get the following error: DNS was successfully queried for the service location (SRV) resource record used to locate a domain controller for domain "ad.win.chigs.me": The query was for the SRV record for _ldap._tcp.dc._msdcs.ad.win.chigs.me The following domain controllers were identified by the query: ip-0af92ac4.ad.win.chigs.me However no domain controllers could be contacted. Common causes of this error include: - Host (A) or (AAAA) records that map the names of the domain controllers to their IP addresses are missing or contain incorrect addresses. - Domain controllers registered in DNS are not connected to the network or are not running. It seems that I can talk to Active Directory, but when I'm trying to contact the Domain Controller, its giving a private IP to connect to, at least thats what I can make out of it. Here are some nslookup results. > win.chigs.me Server: ec2-184-73-35-150.compute-1.amazonaws.com Address: 184.73.35.150 Non-authoritative answer: Name: ec2-184-73-35-150.compute-1.amazonaws.com Address: 10.249.42.196 Aliases: win.chigs.me > ad.win.chigs.me Server: ec2-184-73-35-150.compute-1.amazonaws.com Address: 184.73.35.150 Name: ad.win.chigs.me Address: 10.249.42.196 win.chigs.me and ad.win.chigs.me are CNAME's pointing to my EC2 box. Any idea what I need to do so that I can join my virtual machine to the EC2 Active Directory set up I have? Thanks!

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  • Using proxy.pac to access Apache 2 with a hostname?

    - by leeand00
    Note that I do not have a DNS on my network, and that is why I am resorting to using a proxy.pac file. I would like to be able to access my development Apache 2 server using a name instead of an ip without setting up a full blown DNS. I am aware of setting names in the C:\Windows\System32\drivers\etc\hosts file and the /etc/hosts files, however I cannot edit the hosts file on all of the devices that I am testing the site on. I've added a proxy.pac file to my Apache2 server and pointed my browsers settings to it at: http://192.168.2.221/proxyutils/proxy.pac ...where 192.168.2.221 is thehostname's ip address. I set the above URL in Firefox in the following manner: From the menubar selecting "Edit-Preferences" In the resulting "Firefox Preferences" window clicking the "Advanced" tab. Clicking the "Network" tab Clicking the "Settings" button. Selecting the "Automatic proxy configuration URL:" radio button. Entering http://192.168.2.221/proxyutils/proxy.pac and pressing OK. The contents of the proxy.pac file on the Apache server function FindProxyForURL(url, host) { if( dnsDomainIs(host, "thehostname") ) return "PROXY 192.168.2.221:80"; return "DIRECT"; } In Firefox I then access the following URL: http://thehostname/wp-blog/ And instead of the development version of the Wordpress blog I am trying to access I get a URL of http://thehostnamehttp/thehostname/wp-blog/ in my address bar and a 404 Not Found page in the browser window. Looking over proxy.pac, it seems like calling dnsDomainIs shouldn't work considering I don't have a DNS setup on my network, but I've also tried just comparing the host argument with the string "hostname" and it yielded the same result, even after modifying the proxy.pac file and clicking the reload button near the proxy settings. This could also be a Wordpress problem, since I've noticed that directories without Wordpress seem to function perfectly normally. (see cross post here) Is there any way I can modify my configuration so that I can access the site using http://thehostname/wp-blog/ ?

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  • Need help using a super scope

    - by Vdub
    I have a windows server 2008 r2 standard running our DCHP, DNS, and AD. also I have (3) HP Pro Curve 2510-G switches (J9280A). Right now our LAN is set up 192.168.50.2-192.168.50.254 on our sub-net (A) and another scope with 192.168.51.2-192.168.51.254 sub-net (B) both have sub-net mask of 255.255.255.0. The same server is our DNS which is 192.168.50.242 and our firewall (watchguard) is the gateway at 192.168.50.1. Right now the sub-net (B) does not have DHCP active so only sub-net (A) is giving a pool. My problem is that we are trying to have open WiFi on our network and i am assuming that i can use the sub-net (B) for that if i activate it and use sub-net (A) for our staff only. I have noticed that when i set up a static on a client pc and set it to 192.168.51.x i cannot use the DNS of 192.168.50.242 however i can use 8.8.8.8 and it works fine, i am guessing that because it is on a different sub-net? Forgive me as i am very new at this and dont know a lot. Is there easy way with the equipment i have to a accommodate wifi for hundreds of people without causing problems for our staff? (multiple same IP address assigns) I appreciate any and all info!

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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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  • Migrating to Windows Server 2008 R2 Domain Controllers - a few Questions/Issues

    - by Chris
    Ok so here's our setup: We have 2 Windows 2003 Domain Controllers. I am trying to replace them with Windows 2008 R2. The 2003 servers are named DC01 and DC02. The 2008 R2 servers are DC1 and DC2. I prepared the Windows Server 2003 Forest Schema for a Domain Controller that runs Windows Server 2008 or Windows Server 2008 R2. Then with both of the new servers up as member servers I ran dcpromo on DC1 using the advanced option and added it successfully to my existing domain. It's roles are GC, DNS and Active Directory Domain Services. I transferred The PDC Emulator, RID Pool Manager, and Infrastructure Master roles to DC1. The Schema Master and Domain Naming master are still on DC01. The first issue that I'm encountering is when I dcpromo the DC2 and select "Replicate data over the network from and existing domain controller" I select that I want to replicate from DC1 and I get the following error: Failed to identify the requested replica partner (dc1.xxx.org) as a valid domain controller with a machine account for (DC2$). This is likely due to either the machine account not being replicated to this domain controller because of replication latency or the domain controller not advertising the Active Directory Domain Services. Please consider retrying the operation with \dc01.xxx.org as the replica partner. "The server is unwilling to process the request. Is this because the Schema Master and Domain Naming Master roles are still on the old DC01? And if so, if I transfer Schema Master and Domain Naming Master roles to DC1 what is the risk or breaking my AD? I'm a little paranoid because this process HAS to be transparent. ANY down time or interruption will result in me getting a verbal ass kicking from my I.T. Director. Both of the new servers DNS point the the old DNS servers (DC01 and DC02) not themselves by the way.

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  • w2k3 AD DC Demotion fails with "no other AD DC for that domain can be contacted"

    - by Kstro21
    i've a small office with a single w2k3 sp2 DC(bad idea, but it is real), now, i want to make a clean install of that pc, so, i got another one, install w2k3 sp2, add it to the domain, dcpromo and set it to be a GC, untill now everything is ok, then tried to dcpromo in the primary DC, but it fails with The box indicating that this domain controller is the last controller for the domain mydomain.com is unchecked. However, no other Active Directory domain controllers for that domain can be contacted. Do you wish to proceed anyway? If you click Yes, any Active Directory changes that have been made on this domain controller will be lost. So, i started to move all the roles to the new server as described here, when all was ok with the roles, i tried doing the same, but got the same result. Tried moving the DNS to the new server, but it doesn't make difference. Shutdown to the old server, then tried to log into a workstation, but it fails saying the domain is not available, also coudln't add new workstation to the domain, so i have to power on the old server again. So, if i successfully move all the roles and dns to the new server: why dcpromo give such message in the old server? why if i shutdown the old server the domain is not available?? if i successfully move all the roles and dns to the new server, and i click yes when dcpromo give warning in the old server, will i lose all users, computers, ou, etc.? am i missing some steps to make this work?? hope you can help me thanks

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  • Barriers to IPv6 deployment: addressing

    - by sysadmin1138
    There are several things that are keeping IPv6 deployment from being a topic of active discussion here at my work. There are the usual technical issues, but one non-technical one appears to be a major stumbling block on the path to actually getting a deployment project going. Addresses, memorizing of. Specifically, IPv4 addresses are comprehensible, and IPv6 addresses just look like a big long string of hex. The human mind has real trouble memorizing lists of more than 7-8 items, and an IPv4 address (192.168.231.148) has four items in it which makes it easy for us to memorize. A fully populated IPv6 address has not only 8 sections, but each section has 4 hex digits in it. IPv6 addresses were not designed for memorization. To the technician who knows that the DNS server is at 192.168.42.42 (or more likely "42.42", since the company prefix is likely memorized), the idea of memorizing an IPv6 address fills them with dread. Which in turn makes them much less enthusiastic about participating in an IPv6 deployment project. Because of how our network works we're not fully dynamic in terms of v4 addressing. We have several to many subnets that are entirely statically assigned for a variety of reasons, chief among them being that the overhead of static DHCP assignments is perceived as being too great. Also, some devices still aren't smart enough to pull DNS addresses out of DHCP while also having a static assignment, and therefore require manually configured DNS settings. Therefore, some v6 address memorization will have to be done. We're not under any mandate to get v6 out the door, so we don't have pressure from the top. However, it is time to start prepping our infrastructure to handle IPv6 even if we don't convert wholesale. For those of you who have been in IPv6-land for a while, what short-cut methods do you use to discuss or keep track of subnets and specific/critical IP addresses? If I can help reduce some of the dread surrounding IPv6 we might get the project going.

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  • how to setup a bridge with 2 NICs and few virtual machines

    - by Bond
    Here is my situation. I have a server with 2 NICs. I have installed virtual box and I have created a few Guest Operating Systems on it. I want these Virtual Machines to be using a bridge.NIC2 would be used to setup this bridge and NIC1 would be connected to corporate network.I am not clear with how should I go on doing this. /etc/network/interfaces is the file which I am trying to modify etc. My approach is following 1) Define a configuration file /etc/network/interfaces 2) Create IPTABLES as how NIC1 will forward the packets to Bridge on NIC2 Now comes the problem I do not understand what is the meaning of following lines in the configuration file auto lo iface lo inet loopback # The primary network interface auto eth2 iface eth2 inet manual auto br0 iface br0 inet static address 192.168.1.14 netmask 255.255.255.0 network 192.168.1.0 broadcast 192.168.1.255 gateway 192.168.1.10 # dns-* options are implemented by the resolvconf package, if installed dns-nameservers 192.168.13.2 dns-search myserver.net bridge_ports eth2 bridge_fd 9 bridge_hello 2 bridge_maxage 12 bridge_stp off So any pointers to what should be the entries of /etc/network/interfaces file. So that I understand which parameter is to be used when and where that would help me.

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  • Adding 2nd DC to the domain from a different subnet over VPN.

    - by EagerToLearn
    I'm in the process of adding a second DC to our domain and just want to make sure I have all the steps right before proceeding. Info: DC1 is 2008 R2 Standard. DC2 is 2008 R2 Standard. Network1 is 192.168.39.x/24 Network2 is 10.0.0.x/24 VPN is Sonicwall. The 2 DC's will be at two different sites, but the networks are connected by hardware VPN. (Sonicwall). The main DC server will be on the 192.168.39.0/24 network. The 2nd DC will be on 10.0.0.0/24. Here are the steps I plan to take; please let me know if I'm missing anything. Part 1: AD Sites and Services on DC1, create a new site and subnet for DC2. (Or should I create a new one for both?) (Can I use the default IPSiteLink and not change anything in there other than refresh timer?) Part 2: Point the DNS of DC2 to DC1. Run /forestprep and /domainprep (on both, or just DC1?). Dcpromo and select "Additional Domain Controller for Existing Domain". Then continue with normal steps with default locations for databases. EDIT: Didn't realize this was like reddit and required two skipped lines to skip one :P EDIT 2: When DCPromo-ing DC2, do I need to have "Append primary and connection specific DNS" and "Append parent suffixes of the primary DNS suffix" checked?

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  • RTNETLINK answers: File exists... maybe because assigned a new mac adress

    - by steven
    I got a "RTNETLINK answers: File exists Failed to bring up eth0:1" on "ifup eth0:1". I suspect it happens because i assigned a new mac adress in my VM's network adapter. Can you tell me how to fix the issue? My configuration looks like this: # The loopback network interface auto lo iface lo inet loopback # The primary network interface auto eth0 allow-hotplug eth0 iface eth0 inet static address 192.168.1.80 netmask 255.255.255.0 gateway 192.168.1.1 dns-nameservers 192.168.1.1 # Alias being connected to 192.168.10.x Network auto eth0:1 allow-hotplug eth0:1 iface eth0:1 inet static address 192.168.10.83 netmask 255.255.255.0 gateway 192.168.10.10 dns-nameservers 192.168.10.1 Why do I get "RTNETLINK answer: File exists.." suddenly? I worked with this configuration before without problems. All i did in the past is to renew the adapters mac adress. At the moment I am connected to the 192.168.10.x Network and if I do /etc/init.d/networking stop /etc/init.d/networking start then i got "RTNETLINK [...] falied to bring up eth0:1" but the strage thing is that i am able to connect to 192.168.10.83 via ssh from my host machine. But I cannot reach the internet from the debian client. I hope it is clear what my problem is, now. update if i change my /etc/network/interfaces like this then "ifup eth0" fails, too with the same error! # The loopback network interface auto lo iface lo inet loopback # The primary network interface auto eth0 allow-hotplug eth0 iface eth0 inet static address 192.168.10.83 netmask 255.255.255.0 gateway 192.168.10.10 dns-nameservers 192.168.10.1 with verbose option enabled i got: Configuring interfache eth0=eth0 (inet) run-parts --verbose /etc/network/if-pre-up.d ip addr add 192.168.10.83/255.255.255.0 broadcast 192.168.10.255 dev eth0 label eth0 RTNETLINK answers: File exists Failed to bring up eth0. same if i type this manually: ip addr add 192.168.10.83/255.255.255.0 broadcast 192.168.10.255 dev eth0 label eth0

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