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• Superscope DHCP leases and configuration set up

  - by Vdub

  Hello I wanted to see if someone could help with a network problem I am having. Right now we have a super-scope and scopes of 192.168.50.1 and 192.168.51.1, as of now both are activated but only 192.168.50.1 is handing our leases, 192.168.51 wont. here is a summary of our network Gateway: watchguard firebox x750e for our router/gateway at 192.168.50.1 I set up as a secondary IP address 192.168.51.1 Server: Server 2008 r2 standard, running our DNS @ 192.168.50.242 and 8.8.8.8 as a secondary, AD, and DHCP. On that NIC card i have 192.168.50.242 as the IP address and 192.168.51.242 as a secondary. 192.168.50.1 as the default gateway and 192.168.51.1 as a secondary. Im am not very knowledgeable at this but as far as i have researched after adding a super scope and activating scopes, they should automatically start handing out addresses and I cant figure out why only one does. any help at all would be appreciated.

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• How to block all multicast traffic travelling through a Cisco Catalyst 3750

  - by TrueDuality

  Something changed today. I can't seem to track down what, but one of our 3750s decided that it was going to forward all the multicast traffic it saw from the ghost server across every VLAN it has. I've tried writing a simple access group that consists of the following: access-list 100 deny ip any 224.0.0.10 0.0.0.255 access-list 100 permit ip any any I apparently mistakenly assumed that once applied to an interface that it would block all of the multicast traffic on that interface regardless of VLAN. I do not want any multicast traffic flowing through this particular switch to any VLAN or even to stay on the same VLAN beyond this switch. Does anyone have any ideas?

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• Remotedesktop to windows 2008 server with 2 nics

  - by The_Mo

  Hi I have 2 NICs on a Windows 2008 R2 Server. nic1 with ip address 192.168.2.1 with gatewaty 192.168.2.254 and nic2 with ip address 10.96.6.253 with no gateway. The windows 2008 server is connected to a router which is connnected to another router so if I want to connect to the windows 2008 server I use 192.168.0.31 because it is forwarded. If I use remote desktop to connect to that machine I use 192.168.0.31 and that works well, but the server has a seccond nic and I want to be able to connect with a remotedesktop to nic2. Any help appreciated! [server windows 2008 r2 192.168.2.1] -- [router 192.168.2.254/192.168.0.31] -- [my computer 192.168.0.13 gateway 192.168.0.254]

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• hMailServer Email + MX Records Configuration

  - by asn187

  Trying to make DNS changes to enable email to be sent using hMailServer. My mail server is on a separate machine with a separate IP Address. I have already added MyDomain.com and an email account I have create a MX Record with the mail server being mail.domain.com an a priority on 20. 1) But the question is how do I now link this MX record for the domain to my mail server/ mail server IP Address? 2) What changes are needed in hMailServer to complete the process and be able to send emails for the domain? 3) In Settings SMTP Delivery of email: What should my configuration here look like?

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• Tracking Administrator account for Domain Controller

  - by Param

  Have you ever created a Task Scheduler Event Notification via Email regarding password change or wrong attempt for administrator? Ok Let me Elaborate more.... As we know, that Administrator / domain admin / Enterprise admin is very important. So i want to keep a track of the following event - A) I must received a Email, whenever password is change of the administrator account - with date, time and ip address B) I must received a Email notification, whenever Administrator logs in Successfully or Unsuccessfully with date, time and ip address I am thinking to do the above task with Task Scheduler Event Notification, have you ever done with the same method? Thanks & Regards, Param

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• tcp handshake failed.client send rst (after syn-ack). can any one advice?

  - by user1495181

  architecture: 2 linux computer connected . on the second (192.168.1.1) one run apache server . I have a small program that take tcp packets from nfqueue change the dst ip to 192.168.1.1 in case that the dst ip is 192.168.1.2 (i know that i can do it with iptables , but my program will do more things in the future), fix check sum and return to the queue. if i call to telnet 192.168.1.1 , means that my program dosnt need to do any manipulation, handshake is OK. If i call to telnet 192.168.1.2 , my program change the dest. server get the syn and return syn-ack, but right after getting the syn-ack the client send rst. Can anyone advice? wireshark of the telnet tcpdump of the telenet above

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• Network Services disabled (not starting) on Windows XP

  - by Rickesh John

  I am currently running Windows XP Service Pack 3 on my system. But today, when I failed to connect to the internet, via a LAN cable, I realized that almost all of the vital network services had stopped functioning. Any attempts to start it through services.msc gives me the following message: Could not start the DNS Client Service on Local Computer Error 1068: The dependency service group failed to start All my software or services that are related to networking have stopped functioning, for example, Windows Firewall is turned off permanently, so is my Avast Anti-Virus' service of Real Time Shields and Web Shield. When I insert the LAN wire into my laptop, it registers itself, but this is what I get when I do a ping localhost C:>ping localhost Unable to contact IP driver, error code 2 Moveover, with ipconfig I get this : Windows IP Configuration An internal error occurred: The request is not supported. Please contact Microsoft Product Support Services for further help. Additional Information: Unable to query host name On some further poking around, I saw that none of the "NETWORK SERVICE" process in task manager, except svchost.exe were running. Also, when I first opened the task manager, I saw some 20 processes running with username column empty for most of them. With some search in Google, I found out that these services were important, DHCP DNS Net logon Network connection Network location Awareness TCP/IP Net BIOS Helper none of them, except Network Connections are working, they do not start. The event viewer of my system shows a bunch of 7000 and 7001 event errors. I have tried re installing the network driver, booting in safe mode with networking and tried to enable those services mentioned above. I had disabled System Restore some time back, so I have no restore points for my system. I tried a lot of things from Google searches but none of them worked. Also, with such a long list of issue, I am a little confused as to what should I search on the internet. :( One more thing I would like to mention, previous morning, my anti-virus Avast detected a RootKit buried deep in my system folders. It was removed, but maybe this was a problem caused by the root kit. I did run a boot-time scan but no viruses were found. Please please please advice. Is formatting and re-installation of Windows my only option?

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• NAT and NGINX on the same server

  - by Morten

  I'm setting up a VPC cluster for my collaborative todo list application www.getdoneapp.com. To have my servers on the private network I need a NAT server so my servers on the private network can connect to the internet to receive updates and what not. The NAT server will consume an elastic IP address, so I'm wondering if I can just have that NAT server run nginx to direct traffic to my internal servers for HTTP. So the question is, is it a bad idea to run NGINX and NAT on the same server, or should I go for consuming 2 elastic IP addresses?

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• Fresh Apache install can't be connected to

  - by Wayne M

  I've got to be missing something here. I have a brand new CentOS server with a LAMP install on it. My domain host (GoDaddy) has the server's IP address configured as the "A Record". Since the server will host subdomains I have enabled NameVirtualHost and set up a virtual host pointing to the web app on the server. I haven't touched anything else in Apache, and it's listening on Port 80 like it should be. However, I can't connect to the server either by DNS or by IP address. I've set up several servers exactly like this one and never run into this before. What could be causing this? Did someone on the host set up a firewall or something that blocks port 80? As I said, I can't connect to the server via anything, but it's a barebones box with LAMP installed on it.

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• wifi connection turns off oll the time

  - by er-v

  Hello! I realy need help with one strange problem. I have a wifi network in my appartment with wireless N home router Trendnet tew-652BRP. Everething work fine for three of my laptops, but I have one PC with D-Link DWA-140 adapter. It looses connection 2-3 times in 5 minutes. There is following messages in my system log when it does so: The browser has forced an election on network \Device\NetBT_Tcpip_{9537A5C1-3B43-4C56-B94C-CE69A257C3AD} because a master browser was stopped. The TCP/IP NetBIOS Helper service was successfully sent a stop control. The reason specified was: 0x40030011 [Operating System: Network Connectivity (Planned)] Comment: None The TCP/IP NetBIOS Helper service entered the stopped state. in order of appearence. How can I stop it? I have the latest driver installed.

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• nmap reports host up when it isn't

  - by martianway

  On an Ubuntu VM I ran: sudo nmap -sP 192.168.0.* This returned: Starting Nmap 5.00 ( http://nmap.org ) at 2010-12-28 22:46 PST Host 192.168.0.0 is up (0.00064s latency). Host 192.168.0.1 is up (0.00078s latency). Host 192.168.0.2 is up (0.00011s latency). . . . Host 192.168.0.254 is up (0.00068s latency). Host 192.168.0.255 is up (0.00066s latency). The problem is I only have 4 live machines on 192.168.0.* so why did nmap report every ip in the subnet has a live host? The ip address of the Ubuntu machine is 192.168.28.131 From this VM I can ping the live systems on my internal subnet 192.168.0.* and get the expected response. And if I ping a machine that doesn't exist I can get no response as expected.

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• Setting up the metasploitable in virtualbox

  - by SetSlapShot

  I'm supposed to try and use kali to do exploits on metasploitable, but I'll burn that bridge when I get there. My question right now is: How do I set up a host only network on virtualbox? I heard that it was unsafe to run metasploitable in bridged networking mode, that host only or NAT is better. When I run metasploitable on NAT, the kali box (attacker) has the same ip address as the metasploitable box, and nmap doesn't really return anything except what I can only assume would be a scan of its own ports? I tried to create a host only network in virtual box. I left the adapter settings at the default, and unchecked DHCP server. now when I run ifconfig on the metasploitable box, there is no ip address listed. Am I setting up/connecting to/not configuring the host only network correctly?

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• Iptables REDIRECT + openvpn problem

  - by Emilio

  I want to redirect connection to port 22 to my openvpn binded port, on 60001. Openvpn is running on server on 60001 server:~$ sudo netstat -apn | grep openvpn udp 0 0 67.xx.xx.137:60001 0.0.0.0:* 4301/openvpn I redirect on server port 22 to 60001 server:~$ sudo iptables -F -t nat server:~$ sudo iptables -A PREROUTING -t nat -p udp --dport 22 -j REDIRECT --to-ports 60001 I start openvpn client (openvpn.conf is correct, it works with remote IP 22 replaced with remote IP 60001) client:~$ ./openvpn openvpn.conf Tue Apr 27 00:42:50 2010 OpenVPN 2.1.1 i686-pc-linux-gnu [SSL] [EPOLL] built on Mar 23 2010 Tue Apr 27 00:42:50 2010 UDPv4 link local (bound): [undef]:1194 Tue Apr 27 00:42:50 2010 UDPv4 link remote: 67.xx.xx.137:22 Tue Apr 27 00:42:52 2010 read UDPv4 [ECONNREFUSED]: Connection refused (code=111) Tue Apr 27 00:42:55 2010 read UDPv4 [ECONNREFUSED]: Connection refused (code=111) ... It doesn't connect. iptables shows requests from client to server but no answers. What's wrong with it?

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• How do I route traffic to website using a spcified network connection on Windows 7

  - by rwetzeler

  I want to route all traffic to a website over my wireless connection while the rest of the traffic using my lan. What I tried was first finding out the IP address of the website I want to go to. For example, lets say pandora.com. I found it resolves to 208.85.40.20. I have entered that entry into my hosts file. I then added that route using route add 208.85.40.20 mask 255.255.255.255 WirelessIP. It doesn't seem to work however. Instead of using the IP address, is there a way that I can just say.. this URL to route over that connection? Does anyone know of a program that I can install that will do this.. possibly some sort of proxy or a software load balancer that can do this?

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• Simplest vpn server for linux

  - by Ian R.

  I'm supposed to setup a vpn server on our linux machine for some of our employees who travel a lot. I have 10 ip's on that server so I'm looking into a simple software (not openvpn which is a hell to digest). The software should be able to allow connections from any os type (linux, mac, windows). It should also be able to allow connections via username/password. I would like to assign 1 ip to each client. Any ideas, names?

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• Can I create a virtual network interface to connect to a real network device?

  - by michelemarcon

  I have a networked windows pc with 2 network interfaces. The first connects to a lan with ip address 10.1.. The second connects to another lan with ip address 10.2.. Maybe it's a dumb question, however is it possible to virtualize the second network interface, so that the pc can connect to the 2 lans? If necessary, I may switch to linux or paravirtualization. CLARIFICATION: I want to send DHCP broadcast packets on the second lan, but not on the first lan. I want to do it with one single physical network interface. At the moment, I'm not using any virtualization software.

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• Where to find URLs for sources.list for debian for running apt-get update?

  - by Boda Cydo

  Can anyone tell me where to find URLs to put in /etc/apt/sources.list for debian so that I could run apt-get update? I couldn't find the precise answer by searching Google. When I currently try running apt-get update I get: W: Failed to fetch ftp://ftp.debian.org/debian/dists/lenny/contrib/binary-i386/Packages Unable to fetch file, server said 'Failed to open file. ' [IP: 130.89.148.12 21] W: Failed to fetch ftp://ftp.debian.org/debian/dists/lenny/non-free/binary-i386/Packages Unable to fetch file, server said 'Failed to open file. ' [IP: 130.89.148.12 21] I have no idea how to solve this. Here is how my current sources.list looks like: deb ftp://ftp.debian.org/debian lenny main contrib non-free deb-src ftp://ftp.debian.org/debian lenny main contrib non-free deb ftp://ftp.debian.org/debian lenny/updates main contrib non-free deb-src ftp://ftp.debian.org/debian lenny/updates main contrib non-free I'm running debian_version 5.0.8: # cat /etc/debian_version 5.0.8 Thanks!

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• linux intrusion detection software

  - by Sam Hammamy

  I have an Ubuntu VPS that I use for practice and deploying prototypes as I am a python developer. I recently started teaching my self sys admin tasks, like installing OpenLDAP. I happened to turn off the ufw firewall for just a minute, and when I ran an netstat command, I saw a foreign ip connected to ssh that I traced to china. I'd like to know a few things: 1) Is there any good network intrusion detection software, such that if any IP that's outside a specific range connects to the VPN, I can be notified? -- I am thinking about scripting this, but I'm pretty sure there's something useful out there and I believe in the wisdom of crowds. 2) How did this person gain access to my server? Is it because my firewall was down? Or is it because they browsed my LDAP directory and from there figured out a way to connect (there was a clear text password in the tree but it wasn't one used by the server's sshd)?

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• iptables - drop all HTTP(S) traffic but from CloudFlare

  - by Martin

  I would like to allow only HTTP(S) traffic coming from CloudFlare. In that way attackers cannot attack the server directly. I know CloudFlare is not mainly a DDoS mitigator, but I would like to try it either way. I'm currently only having access to iptables (ipv4 only), but will try to install ip6tables soon. I just need to have this fixed soon. (we're getting (D)DoSed atm.) I was thinking about something like this: iptables -I INPUT -s <CloudFlare IP> --dport 80 -j ACCEPT iptables -I INPUT -s <CloudFlare IP> --dport 443 -j ACCEPT iptables -I INPUT -p tcp --dport 80 -j DROP iptables -I INPUT -p tcp --dport 443 -j DROP I know that CloudFlare has multiple IPs, but just for an example. Would this be the right way?

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• Windows VPN - NO internet access

  - by sharru

  I host a network of servers behind a Fortigate 200a firewall in the DC. I connect to those servers via a VPN connection. The problem is that when i connect to the VPN, I lose my internet connection on the local PC (windows 7). I would like to be connected to the VPN and still surf the web. i guess this means to only forward a range of ip to the VPN connection. I've read other answers on serverfault, talking about "un-check the 'Use default gateway on remote network' option in your Windows 7 PPTP network connection settings". When i do that , i get internet access but no access to the servers in the VPN. Any idea how to get both working? Should i change something on the fortigate 200a config? Do i need two networks cards? Is there a place in windows to define ip range for the vpn connection?

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• cannot access my own computer through My Network Places

  - by WebMAOhist

  My home Windows XP Pro SP3 machine is DHCP client receiving configurations from ISP. Trying to access in WindowsExplorer -My Network Places - Microsoft Windows Network shows Workgroup with a delay of 3 min and then popups messagebox: Microsoft Windows Network Workgroup 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 list of servers for this workgroup is not currently available OK I am logged-in as local machine Administrator. The internet is accessible (I am writing this post through it) The Firewall is disabled The "Computer Bowser" and all networking services, I could find, are running Control Panel -- Network Connections -- Properties (of connection) --- Internet Protocol (TCP/IP), btn Properties --- --- tab General, btn "Advanced..." -- tab WINS-- rbtn "Enable NetBIOS over TCP/IP" checked Why cannot I access my own PC (and shares on it) through My Network Places What is the possible problem? How to daignose the problem?

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• exim4: multiple domains/IPs

  - by ButterdBread

  On my VPS I have 3 IPs which all have their own domain and their own reverse-DNS records. I have a website on each domain, sending emails. The problem is: the emails are rejected by many hosts because the reverse dns doesn't fit the host in the helo. All the emails are sent from the primary IP and therefore only one of the three domains work. I am looking for a way for exim to check which email adress i'm using to send the email and adapt the domain/IP transmitted in the helo. I have already tried many configurations but nothing has worked up to now. Simply changing MX-Records is impossible too, as I recieve (and also send) email via gmail and I don't want to set up my own webmail. Does anyone know a solution?

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• how to setup a public dns server?

  - by Zhenyu Li

  I just installed powerdns, and I added the record example.com A 120 1.2.3.4 and I used dig to see if it works, and it works. dig @localhost example.com and it will show the correct ip address : 1.2.3.4 My question is how to use this dns server in the public, so that my domain example.com to be dig without the @localhost? I will need the ns1.example.com ns2.example.com to be pointed to my 2 powerdns server ip, and I need to use my dns server to set the ns1.example.com, ns2.example.com, so that my other products could also setup ns1.example.com as their dns server, so how to do this?Edit

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• Cisco access list logging. Why is there a difference between IPv4 and IPv6?

  - by growse

  I've got a Cisco 877 router. I've got an IPv4 access list and an IPv6 access list set up and configured similar to this: interface Dialer1 ... ip access-group INTERET-IN ipv6 traffic-filter IPV6-IN Each of these access lists has a final rule of deny ip/ipv6 any any log. However, in my syslog I notice that there's a difference in formatting between the two types of entries. IPv4 will say: %SEC-6-IPACCESSLOGP: list INTERNET-IN denied udp 88.89.209.63(137) -> 1.2.3.4(137), 1 packet Whereas the IPv6 list will say %IPV6_ACL-6-ACCESSLOGNP: list IPV6-IN/240 denied 59 2001:0:5EF5:79FD:14F9:B773:3EBA:3EE3 (Dialer1) -> 2001:800:1000:0::1, 8 packets Both have broadly the same information, but the IPv6 log entry is missing the protocol type and port, both of which are very useful if I'm trying to troubleshoot connectivity. Why is this? How do I get IPv6 deny logs to display the protocol and port used, if any?

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• FTP server questions

  - by Brad

  I'm currently trying to set up a home FTP server using debian and proftpd and I've run into a problem that has me confused. I have most things set up already, I believe, but I cannot access my ftp server using my external ip. I've forwarded the correct port on my router and I've checked http://www.yougetsignal.com/tools/open-ports/ to be sure that it is, in fact, opened. I've used telnet locally on my server to check that the port accepts connections. I am able to use ftp via LAN. But, I still cannot access anything externally. I'm thinking that there's still some router configuration to be done in order to fix this, such as routing all connections on my ftp port to my server via the internal ip, but I can't find any option on my router to do this. Is this a necessary step? There is an option to use DMZ hosting, but I'd rather avoid it if possible. I can provide additional information as requested, please let me know any information that you think could help at all. Thanks. -Brad PS - I have a Telus Actiontec Modem/Router Update - !! Trying my ftp server out at work, worked! I guess I did set it up correctly after all. What is confusing me, though, is why doesn't the server allow me to connect locally anymore? That seems very weird to me. Also, I don't really understand why I am denied outright if I attempt to connect from the same network using the external address. I'll look into it more when I get home, but thank you guys for your help. Update 2 - I found the problem with not being able to connect locally anymore. I was setting the masquerade address to my external IP and for some reason that was causing it to hang on MLSD when I connected using my LAN address. I've removed the masquerade address and I'm going to check if I need it at work tomorrow. I'll update this page if I find anything.

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