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• Add static route through DHCP

  - by MathieuK

  I'm trying to get an OSX Lion Server to provide a static route to its clients (all OSX Lion) over DHCP. I can't get the client to actually apply the static route. So far, I've managed to get the DHCP server (BOOTPD) to actually serve the DHCP OPTION 33 (static_route) on the DHCP offers by editing /etc/bootpd.plist and adding something like: <key>dhcp_option_33</key> <data>[some base64 goes here]</data> .. and restarting the DHCP service. On the client I've managed to get the client to actually request the dhcp option by modifying and adding option 33 to the DHCPRequestedParameterList key: <key>DHCPRequestedParameterList</key> <array> ... keys snipped for brevity ... <integer>33</integer> </array> .. and rebooting the client. This makes the client request the static_route option from the DHCP server ( i can see the proper output in ipconfig getpacket en0 ) but it doesn't actually apply the rule. Has anyone ever succeeded in applying static_route options on OSX clients through DHCP?

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• Is it possible to setup a DHCP server only for local virtual machines?

  - by thiesdiggity

  I have a quick question. I have a bunch of virtual machines (VMWare Workstation) running on an Ubuntu server and have found that VMWare NAT (DHCP) service is unreliable and slow. I have to use NAT instead of bridging because the server is in a data-center that does not have DHCP and I don't have enough static IP's for all the VMs. Is it possible to setup the host (Ubuntu) to be a DHCP server but only for the local virtual machines? The server has 2 network interfaces, so I'd set eth0 to be a static IP, which connects to the outside world, and eth1 to listen for DHCP. Now, I am thinking if I don't want DHCP to broadcast I would just not connect a cable to eth1 and setup the VM's to use bridging on eth1. That way DHCP would not broadcast through my network but be listening on that interface. Would that setup work?

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• Setting up a VPN server on Windows XP from the console

  - by dax

  I want to set up a VPN server in Windows XP. I know how to do this using the GUI dialogs but I'm wondering if it's possible to do it from console.

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• Advice on Auditing VPN Connections

  - by WhiteAdam

  I've inherited a network that is truly a mess and the VPN config is amazingly long with confusing group names and very little documentation. I am curious to see how others have gone about auditing these types of connections. Are there any forms out there? What information should I collect? I assume things like Customer, Department, Technical Lead, and etc. Thanks in advance for any advice on this nightmare.

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• What's the correct MAAS DHCP configuration?

  - by k to the z

  I've set up a MAAS controller by following this documentation: http://maas.ubuntu.com/docs1.4/cluster-configuration.html However, when I got to the DHCP configurations I was a little puzzled. The controller I created is at 172.16.142.61. It looks like that's the address for the "IP" text field. Going down the rest of the list I'm unsure of though. Should I just put in the subnet/broadcast/router (is that the gateway?) that the MAAS server resides in or am I suppost to just list the static address of the MAAS server and then define my own "virtual" subnet in the fields below?

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• dhcp configuration not working ubuntu 11.10

  - by Vivek Pradhan

  I am usually behind a proxy server in college so I connect to the ethernet or wifi using manual IPv4 addresses only inside college. I have been trying really hard to get the internet work at home, there is no proxy and I have set the network to use automatic dhcp. It seems like it is not able to connect to the port, It gets disconnected after some time automatically and then tries to reconnect. The same thing is happening with wifi networks also, after some time i see a pop up asking for authentication and ultimately its not able to connect. What might be the problem here. I looked up some similar questions and checked the /etc/network/interfaces file and looks like this: auto lo iface lo inet loopback I have no idea what those lines mean but there is no configuration for eth0 or wlan0. Any help is deeply appreciated. Ubuntu loses it charms due to these small glitches.

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• DHCP Fails To Start

  - by user209138

  I just installed Ubuntu 12.0.4 on an HP 8560 laptop. I installed Fog version 29 and everything worked just fine except the DHCP3 package failed to start. When I run the install command it says DHCP3 is installed, but when I type in the following command to start DHCP (sudo /etc/init.d/DHCP3-server start it says the command is not found. Is there a different command for Ubuntu 12? I have been using Ubuntu 10 on my other fog servers and that command works fine.Thank you for your help.

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• Creating a new DHCP lease databse

  - by Stee1bear

  I have Ubuntu Server set up as my DCHP server. We have had it install for a few year and our dchp.lease file contain over 4000 entries. I am wanting to clean it up and basically start a new lease file to get current list (@1500 entries). I have read the walk through on how to make a new lease file and get it started, which leads me to this question. Will the dhcp server try to give each unit new IP address or will it build the new database with the IP addresses that the the units report to it?

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• MAC filtering after DHCP

  - by user1655161

  How to manage filtering by MAC in Ubuntu? Scenario: Ubuntu DHCP is configured and working (network 192.168.1.0) a) Laptop 1 is set in configuration on Ubuntu as static IP Laptop 1 is configured for automatic IP and when is connected to server everything works. I'm taking laptop 2 which is configured as static IP 192.168.1.10 and his configuration is not set in Ubuntu dhcpd.conf After laptop 2 is connected internet working. It is possible to do MAC filtering which disallow to connect PCs with address IP set as static but MAC address is not configured in Ubuntu (something like: intruder in network)?

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• dnsmasq acts as the DHCP server for selected nodes overriding the existing DHCP server on the same LAN?

  - by user183394

  I am trying to set up a small "lab" at home. Like many modern homes, I have a regular DSL service which comes with a 2Wire 3600HGV router, which acts also as a DHCP server. Since I would like to PXE boot a few computers in my "lab" The 2Wire is inflexible to adjustments that I want to do I have used dnsmasq at work so I would like to use dnsmasq as the DHCP server for the few nodes in my "lab" if feasible. In the dnsmasq man page, there is the following: [...] -K, --dhcp-authoritative (IPv4 only) Should be set when dnsmasq is definitely the only DHCP server on a network. It changes the behaviour from strict RFC compliance so that DHCP requests on unknown leases from unknown hosts are not ignored. This allows new hosts to get a lease without a tedious timeout under all circumstances. It also allows dnsmasq to rebuild its lease database without each client needing to reacquire a lease, if the database is lost. [...] As far as I know, the ISC DHCP server can use the following to do what I would like to accomplish: authoritative; [...] subnet 192.168.1.0 netmask 255.255.255.0 { host nb0 { # only give DHCP information to this computer: hardware ethernet e8:9a:8f:17:70:42; fixed-address 192.168.1.10; option subnet-mask 255.255.255.0; option routers 192.168.1.254; option domain-name-servers 192.168.1.254; # Non-essential DHCP options filename "/pxelinux.0"; } [...] But I much prefer dnsmasq's "all-in-one-ness". My question: do I have to couple the -K option with something else? As shown in the example above, the ISC DHCP server requires the mac addresses of managed nodes to be explicitly specified. Does dnsmasq have something similar? FYI, the machine on which I plan to run dnsmasq runs CentOS 6.3 64bit. It has a statically assigned IP address: 192.168.1.3.

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• 2 routers, both DHCP, no IP assigned

  - by piobyz

  I can't get DHCP to assign IP to my wireless devices. My network config is as follows: Nanostation5 Linksys WRT350N, which is connected with Nanostation via its INTERNET port. Nanostation: LAN IP Address: 192.168.1.20 WLAN IP Address: 192.168.0.79 Network Mode: Router and is getting its IP via DHCP from my ISP Netmask: 255.255.255.0 Gateway IP: 192.168.1.1 LAN Network settings: IP Address: 192.168.1.20 Netmask: 255.255.255.0 Enable NAT: YES ENABLE DHCP Server: YES Range 192.168.1.100 ~ 250 Netmask: 255.255.255.0 Enable DNS Proxy: YES Linksys: Internet Connection Type: DHCP Router IP: 192.168.2.1 Subnet Mask: 255.255.255.0 DHCP: Enabled Start IP: 192.168.2.100 ~ 120 Advanced Routing: NAT: Enabled What I can do is connecting manually with this config: IP: 192.168.2.101 Subnet Mask: 255.255.255.0 Router: 192.168.2.1 DNS: 192.168.1.20 Search domains: WRT350N I want to be able to connect to both routers independently(now its 192.168.1.20 for Nanostation, and 192.168.2.1 for Linksys) and connect any wireless device using DHCP. What should be IP ranges, masks, etc. on both devices?

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• l2tp / ipsec debian Openswan U2.6.38 does not connect

  - by locojay

  i am trying to get ipsec/l2tp running on a debian server with an iphone as a client but always get: Dec 2 21:00:04 vpn pluto[22711]: packet from <clientip>:43598: received Vendor ID payload [RFC 3947] method set to=115 Dec 2 21:00:04 vpn pluto[22711]: packet from <clientip>:43598: received Vendor ID payload [draft-ietf-ipsec-nat-t-ike] meth=114, but already using method 115 Dec 2 21:00:04 vpn pluto[22711]: packet from <clientip>:43598: received Vendor ID payload [draft-ietf-ipsec-nat-t-ike-08] meth=113, but already using method 115 Dec 2 21:00:04 vpn pluto[22711]: packet from <clientip>:43598: received Vendor ID payload [draft-ietf-ipsec-nat-t-ike-07] meth=112, but already using method 115 Dec 2 21:00:04 vpn pluto[22711]: packet from <clientip>:43598: received Vendor ID payload [draft-ietf-ipsec-nat-t-ike-06] meth=111, but already using method 115 Dec 2 21:00:04 vpn pluto[22711]: packet from <clientip>:43598: received Vendor ID payload [draft-ietf-ipsec-nat-t-ike-05] meth=110, but already using method 115 Dec 2 21:00:04 vpn pluto[22711]: packet from <clientip>:43598: received Vendor ID payload [draft-ietf-ipsec-nat-t-ike-04] meth=109, but already using method 115 Dec 2 21:00:04 vpn pluto[22711]: packet from <clientip>:43598: received Vendor ID payload [draft-ietf-ipsec-nat-t-ike-03] meth=108, but already using method 115 Dec 2 21:00:04 vpn pluto[22711]: packet from <clientip>:43598: received Vendor ID payload [draft-ietf-ipsec-nat-t-ike-02] meth=107, but already using method 115 Dec 2 21:00:04 vpn pluto[22711]: packet from <clientip>:43598: received Vendor ID payload [draft-ietf-ipsec-nat-t-ike-02_n] meth=106, but already using method 115 Dec 2 21:00:04 vpn pluto[22711]: packet from <clientip>:43598: ignoring Vendor ID payload [FRAGMENTATION 80000000] Dec 2 21:00:04 vpn pluto[22711]: packet from <clientip>:43598: received Vendor ID payload [Dead Peer Detection] Dec 2 21:00:04 vpn pluto[22711]: "L2TP-PSK-noNAT"[4] <clientip> #20: responding to Main Mode from unknown peer <clientip> Dec 2 21:00:04 vpn pluto[22711]: "L2TP-PSK-noNAT"[4] <clientip> #20: transition from state STATE_MAIN_R0 to state STATE_MAIN_R1 Dec 2 21:00:04 vpn pluto[22711]: "L2TP-PSK-noNAT"[4] <clientip> #20: STATE_MAIN_R1: sent MR1, expecting MI2 Dec 2 21:00:04 vpn pluto[22711]: "L2TP-PSK-noNAT"[4] <clientip> #20: NAT-Traversal: Result using draft-ietf-ipsec-nat-t-ike (MacOS X): both are NATed Dec 2 21:00:04 vpn pluto[22711]: "L2TP-PSK-noNAT"[4] <clientip> #20: transition from state STATE_MAIN_R1 to state STATE_MAIN_R2 Dec 2 21:00:04 vpn pluto[22711]: "L2TP-PSK-noNAT"[4] <clientip> #20: STATE_MAIN_R2: sent MR2, expecting MI3 Dec 2 21:00:04 vpn pluto[22711]: "L2TP-PSK-noNAT"[4] <clientip> #20: ignoring informational payload, type IPSEC_INITIAL_CONTACT msgid=00000000 Dec 2 21:00:04 vpn pluto[22711]: "L2TP-PSK-noNAT"[4] <clientip> #20: Main mode peer ID is ID_IPV4_ADDR: '10.2.210.176' Dec 2 21:00:04 vpn pluto[22711]: "L2TP-PSK-noNAT"[4] <clientip> #20: switched from "L2TP-PSK-noNAT" to "L2TP-PSK-noNAT" Dec 2 21:00:04 vpn pluto[22711]: "L2TP-PSK-noNAT"[5] <clientip> #20: deleting connection "L2TP-PSK-noNAT" instance with peer <clientip> {isakmp=#0/ipsec=#0} Dec 2 21:00:04 vpn pluto[22711]: "L2TP-PSK-noNAT"[5] <clientip> #20: transition from state STATE_MAIN_R2 to state STATE_MAIN_R3 Dec 2 21:00:04 vpn pluto[22711]: "L2TP-PSK-noNAT"[5] <clientip> #20: new NAT mapping for #20, was <clientip>:43598, now <clientip>:49826 Dec 2 21:00:04 vpn pluto[22711]: "L2TP-PSK-noNAT"[5] <clientip> #20: STATE_MAIN_R3: sent MR3, ISAKMP SA established {auth=OAKLEY_PRESHARED_KEY cipher=aes_256 prf=oakley_sha group=modp1024} Dec 2 21:00:04 vpn pluto[22711]: "L2TP-PSK-noNAT"[5] <clientip> #20: Dead Peer Detection (RFC 3706): enabled Dec 2 21:00:05 vpn pluto[22711]: "L2TP-PSK-noNAT"[5] <clientip> #20: the peer proposed: <public ip>/32:17/1701 -> 10.2.210.176/32:17/0 Dec 2 21:00:05 vpn pluto[22711]: "L2TP-PSK-noNAT"[5] <clientip> #20: NAT-Traversal: received 2 NAT-OA. using first, ignoring others Dec 2 21:00:05 vpn pluto[22711]: "L2TP-PSK-noNAT"[5] <clientip> #21: responding to Quick Mode proposal {msgid:311d3282} Dec 2 21:00:05 vpn pluto[22711]: "L2TP-PSK-noNAT"[5] <clientip> #21: us: 171.138.2.13<171.138.2.13>:17/1701 Dec 2 21:00:05 vpn pluto[22711]: "L2TP-PSK-noNAT"[5] <clientip> #21: them: <clientip>[10.2.210.176]:17/61719 Dec 2 21:00:05 vpn pluto[22711]: "L2TP-PSK-noNAT"[5] <clientip> #21: transition from state STATE_QUICK_R0 to state STATE_QUICK_R1 Dec 2 21:00:05 vpn pluto[22711]: "L2TP-PSK-noNAT"[5] <clientip> #21: STATE_QUICK_R1: sent QR1, inbound IPsec SA installed, expecting QI2 Dec 2 21:00:05 vpn pluto[22711]: "L2TP-PSK-noNAT"[5] <clientip> #21: Dead Peer Detection (RFC 3706): enabled Dec 2 21:00:05 vpn pluto[22711]: "L2TP-PSK-noNAT"[5] <clientip> #21: transition from state STATE_QUICK_R1 to state STATE_QUICK_R2 Dec 2 21:00:05 vpn pluto[22711]: "L2TP-PSK-noNAT"[5] <clientip> #21: STATE_QUICK_R2: IPsec SA established transport mode {ESP=>0x05e23c9a <0x216077a9 xfrm=AES_256-HMAC_SHA1 NATOA=10.2.210.176 NATD=<clientip>:49826 DPD=enabled} Dec 2 21:00:26 vpn pluto[22711]: "L2TP-PSK-noNAT"[5] <clientip> #20: received Delete SA(0x05e23c9a) payload: deleting IPSEC State #21 Dec 2 21:00:26 vpn pluto[22711]: "L2TP-PSK-noNAT"[5] <clientip> #20: received and ignored informational message Dec 2 21:00:27 vpn pluto[22711]: "L2TP-PSK-noNAT"[5] <clientip> #20: received Delete SA payload: deleting ISAKMP State #20 Dec 2 21:00:27 vpn pluto[22711]: "L2TP-PSK-noNAT"[5] <clientip>: deleting connection "L2TP-PSK-noNAT" instance with peer <clientip> {isakmp=#0/ipsec=#0} Dec 2 21:00:27 vpn pluto[22711]: packet from <clientip>:49826: received and ignored informational message Dec 2 21:00:27 vpn pluto[22711]: ERROR: asynchronous network error report on eth0 (sport=4500) for message to <clientip> port 49826, complainant <clientip>: Connection refused [errno 111, origin ICMP type 3 code 3 (not authenticated)] my setup looks like this verizon fios actiontec -- DMZ-- ddwrt router -- debian xen instance actiontec : 192.168.1.1 ddwrt: 171.138.2.1 debian xen server: 171.138.2.13 forwarded udp 500, 4500, 1701 on ddwrt to debian xen instance. vpn passthrough is enabled /etc/ipsec.conf config setup dumpdir=/var/run/pluto/ nat_traversal=yes virtual_private=%v4:10.0.0.0/8,%v4:192.168.0.0/16,%v4:172.16.0.0/12,%v4:25.0.0.0/8,%v6:fd00::/8,%v6:fe80::/10,%v4:!171.138.2.0/24,%v4:!192.168.1.0/24 protostack=netkey # Add connections here conn L2TP-PSK-NAT rightsubnet=vhost:%priv also=L2TP-PSK-noNAT conn L2TP-PSK-noNAT authby=secret pfs=no auto=add keyingtries=3 # we cannot rekey for %any, let client rekey rekey=no # Apple iOS doesn't send delete notify so we need dead peer detection # to detect vanishing clients dpddelay=30 dpdtimeout=120 dpdaction=clear # Set ikelifetime and keylife to same defaults windows has ikelifetime=8h keylife=1h # l2tp-over-ipsec is transport mode type=transport # left=171.138.2.13 # # For updated Windows 2000/XP clients, # to support old clients as well, use leftprotoport=17/%any leftprotoport=17/1701 # # The remote user. # right=%any # Using the magic port of "%any" means "any one single port". This is # a work around required for Apple OSX clients that use a randomly # high port. rightprotoport=17/%any #force all to be nat'ed. because of ios conn passthrough-for-non-l2tp type=passthrough left=171.138.2.13 leftnexthop=171.138.2.1 right=0.0.0.0 rightsubnet=0.0.0.0/0 auto=route /etc/xl2tp/xl2tp.conf [global] ipsec saref = no listen-addr = 171.138.2.13 ;port = 1701 ;debug network = yes ;debug tunnel = yes ;debug network = yes ;debug packet = yes [lns default] ip range = 171.138.2.231-171.138.2.239 local ip = 171.138.2.13 assign ip = yes require chap = no refuse pap = no require authentication = no ;name = OpenswanVPN ppp debug = yes pppoptfile = /etc/ppp/options.xlt2tpd lenght bit = yes /etc/ppp/options.xl2tpd ;require-mschap-v2 pcp-accept-local ipcp-accept-local ipcp-accept-remote ;ms-dns 171.138.2.1 ms-dns 192.168.1.1 ms-dns 8.8.8.8 name l2tpd noccp auth crtscts idle 1800 mtu 1410 mru 1410 lock proxyarp connect-delay 5000 debug dump logfd 2 logfile /var/log/xl2tpd.log ipsec verify Checking your system to see if IPsec got installed and started correctly: Version check and ipsec on-path [OK] Linux Openswan U2.6.38/K3.0.0-1-amd64 (netkey) Checking for IPsec support in kernel [OK] SAref kernel support [N/A] NETKEY: Testing XFRM related proc values [OK] [OK] [OK] Checking that pluto is running [OK] Pluto listening for IKE on udp 500 [OK] Pluto listening for NAT-T on udp 4500 [OK] Two or more interfaces found, checking IP forwarding [FAILED] Checking NAT and MASQUERADEing [OK] Checking for 'ip' command [OK] Checking /bin/sh is not /bin/dash [WARNING] Checking for 'iptables' command [OK] Opportunistic Encryption Support [DISABLED] The failed can be ignored i guess since cat /proc/sys/net/ipv4/ip_forward returns 1 any help would be much appreciated as i don't have any idea why this is not working

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• Cisco VPN Connection - No internet no nothing

  - by Kevin

  Hi all, Sorry if this has been posted, I tried searching but I am not exactly sure what I am looking for, I am a developer not a networking guy. We have a client whom we need to use Cisco VPN client to connect to their servers. I have installed the software, dropped in the provided .pcf file, and I can connect. However, when I do, I lose all local and internet capabilities, no hosts resolve, and I still can't connect to their internal FTP and development sites. This leads me to believe either a setting is wrong in my Cisco software, and/or their network is not correctly configured. Does anyone know anything about Cisco VPN'ing that can give me a hand? My colleague seems to indicate that they need to enable split tunneling on their end (or a similar setting).

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• Cisco VPN and .pcf file

  - by yael

  I have few of profiles .pcf files , and I used them in order to automate the vpmclient connection VIA CLI command I have WIN XP server for example vpmclient connect "customor_alpha" until now everything is ok but I have problem with the last of my profiles - area1.pcf the problem is when I type in CMD window the following ( to create VPN connection ) vpmclient connect "area1" after 2 second CISCO window will pop up and ask for password , ( username already defined in window ) please advice what could be the problem , why I get the "CISCO PVN window" ? or maybe I have some in correct syntax in my .pcf file , I checked the .pcf file again and again and I couldn't find the problem ? example of area1.pcf ( only example - not my real pcf ) [main] Description=connection to TechPubs server Host=10.10.99.30 AuthType=1 GroupName=docusers GroupPwd= enc_GroupPwd=158E47893BDCD398BF863675204775622C49<SNIPPED> EnableISPConnect=0 ISPConnectType=0 ISPConnect= ISPCommand= Username=alice SaveUserPassword=0 UserPassword= enc_UserPassword= NTDomain= EnableBackup=1 BackupServer=Engineering1, Engineering2, Engineering 3, Engineering4 EnableMSLogon=0 MSLogonType=0 EnableNat=1 EnableLocalLAN=0 TunnelingMode=0 TCPTunnelingPort=10000 CertStore=0 CertName= CertPath= CertSubjectName SendCertChain=0 VerifyCertDN=CN=”ID Cert”,OU*”Cisco”,ISSUER-CN!=”Entrust”,ISSURE-OU!*”wonderland” DHGroup=2 PeerTimeOut=90 ForceNetLogin=

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• Dynamic Bind9 + DHCP

  - by AcidRod75

  i have been working on setup a server for my internal network, so far i have a working isc-dhcp-server that can upgrade a chrooted BIND9 (on the same machine), i need to add some static entries on the DNS, so users can resolve the websites that resides in our DMZ. What i had tryed all ready was to modify the /etc/bind/named.conf.local with this info: // // Do any local configuration here // // Consider adding the 1918 zones here, if they are not used in your // organization //include "/etc/bind/zones.rfc1918"; key DHCP_UPDATER { algorithm HMAC-MD5.SIG-ALG.REG.INT; secret "MySuperSecretHash"; (this is not the real value BTW) }; zone "quality.internal" IN { type master; file "/var/lib/bind/quality.internal.db"; allow-update { key DHCP_UPDATER; }; }; zone "0.10.10.in-addr.arpa" { type master; file "/var/lib/bind/rev.10.10.0.in-addr.arpa"; allow-update { key DHCP_UPDATER; }; }; logging { channel query.log { file "/var/log/named/query.log"; severity debug 3; }; category queries { query.log; }; }; --- EOF ---- then i added this 2 entries: zone "ourserver.internal" IN { type master; file "/var/lib/bind/ourserver.internal.db"; }; zone "0.16.172.in-addr.arpa" { type master; file "/var/lib/bind/rev.172.16.0.in-addr.arpa"; }; ---- EOF ---- So.. i created the files ourserver.internal.db and rev.172.16.0.in-addr.arpa placed them BOTH in /var/lib/bind/ and changed the permisions so the bind user can access them, restated the service... when i do a NSLOOKUP www.ourserver.internal i get: Server: 127.0.0.1 Address: 127.0.0.1#53 ** server can't find www.ourserver.internal: NXDOMAIN BUT when i do a reverse lookup.... Server: 127.0.0.1 Address: 127.0.0.1#53 5.0.16.172.in-addr.arpa name = www.ourserver.internal I do not understand what's wrong. Some help with this will save me from installing a new DNS server at the DMZ JUST to host internal site names- TY in advance BTW: the server i'm using has Ubuntu Server 11.10 fully patched.

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• Windows or Linux for VPN-VPN Bridge

  - by James

  I have the following network layout: Network1 ----VPN1-----Network2----VPN2----Network3 I can administer everything in Network1 only and my goal is to get to a box on Network3. I've been told by the admins of Network2 that it's not possible for them to route traffic from Network1 to Network3. I've finally been authorised to host a box in Network2 and I'm hoping with this I can set something up to resolve the issue. My question is should I set this up as a Windows or a Linux box. My initial thought was to use iptables to reroute requests but with my lack of experience with Windows Server (used for something or other in Network2) I'm not sure if this will work. My head's full of questions like: - can I get an ip without logging in to a windows domain? - if I do get an ip, do Windows Servers manage routing through the VPN? - can I make a linux box authenticate with Windows Server to log on to the domain? - would it just be easier to set up a windows box? - is it possible to configure a windows box to do routing from Network1 to Network3? Has anyone done anything like this before? Had experience managing Windows Server? Authenticated (or not as the case may be) to a Windows domain? I'd really appreciate your advice. It might be worth mentioning that the overall objective is to establish a telnet connection from a box on Network1 to a box on Network3.

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• PXE boot and DHCP server configuration Failing Auto Installation

  - by Harihara Vinayakaram

  I have a ISC DHCP Server installed on Ubuntu 9.10 . I have managed to successfully boot a PXE client , obtain a DHCP address and load the initrd.gz file. But I am facing a vague problem when the debian installer starts up and tries to get a DHCP server The client send a DHCP request and I verified that is the same MAC Address. But I get a DHCP DECLINE (The client declines the address ). It offers all the address in the pool and then there is a DHCP NAK (no more free leases ) I tried using the Option no-ping, and also option one-client-one-lease but it does not help . If I set the client to use a fixed-address then the above problem is not there and the installation proceeds smoothly Can you give me any clues on what should be the DHCP server configuration My dhcpd.conf looks like this { ddns-update-style none; option domain-name "hadoop-myorg.org"; option domain-name-servers 192.168.3.5; default-lease-time 600; max-lease-time 7200; group { filename "pxelinux.0"; next-server 192.168.13.184; host hadoop1 { hardware ethernet 90:e6:ba:d5:53:f8; } } subnet 192.168.13.0 netmask 255.255.255.0 { option routers 10.0.0.254; pool { option domain-name-servers 192.168.3.5; max-lease-time 3000; range 192.168.13.55 192.168.13.65; deny unknown-clients; } } }

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• DHCP Server on local machine

  - by EralpB

  Hello I am trying to setup a dhcp3-server on Ubuntu. But my question is more generic, if dhcp server is in a blockbox and all clients are connected to it I think I get what is going on but when dhcp server is installed on one of the "clients" that confuses me. When I send a dhcp packet from that client to the dhcp server, will my ethernet card read and write at the same time? Or will it handle it internally without writing any data to ethernet cable. It's the first time I am encountering these network things so I am a little bit confused. Also I wonder If I am in a big network with lan IP let's say 192.168.0.100 and I install a dhcp server to my computer, can any other computers accidentally get IP from my dhcp server? Every computer has one ethernet card (if that matters?). And every computer is connected to one router. I guess the answer is no because the broadcast message won't reach to my computer since when router receives a dhcp search packet it will answer and it won't let other computers know about it because they don't need to. And without router sending that packet one by one, it cannot travel further. I'd be glad if someone enlightens me. Thank you very much.

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• On Windows 2008 R2, how do I back up DHCP if the DHCP .mdb database is always busy?

  - by johnny

  I get this from my backup software. C:\WINDOWS\system32\dhcp\dhcp.mdb : The process cannot access the file because it is being used by another process. C:\WINDOWS\system32\dhcp\j50.log : The process cannot access the file because it is being used by another process. C:\WINDOWS\system32\dhcp\j50tmp.log : The process cannot access the file because it is being used by another process. C:\WINDOWS\system32\dhcp\tmp.edb : The process cannot access the file because it is being used by another process. My questions: Should I be doing a manual backup of DHCP via command line tools or maybe with MMC, Action, Backup before I run my backup? Is the %SystemRoot%\System32\DHCP\Backup directory always kept up to date? (which does get backed up by backup software) I'm answering my own question but the registry key is set up for 3c, 60 minutes, I believe. HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\DHCPServer\Parameters\BackupInterva This is not the included backup software for Windows. It is another product, but I have seen this with every backup software I've ever used.

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• Setup a vpn server on Ubuntu server, but client can't setup a connection

  - by Jing

  I setup a vpn server using pptpd on the ubuntu server which is installed in a virtual box machine on a windows 7 desktop. I configure the vpn server and port forwarding in the windows. However, I cannot setup a connection to the server. Here's the ubuntu log I got when I tried to connect to this vpn server Anyone can help me solve this problem? Also, is there any alternative way to setup a vpn server on windows or virtual machine installed on windows? Thanks!

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• Some DHCP clients end up with wrong DNS server

  - by Nic Waller

  The scenario: DC running Windows Server 2008 R2 providing DNS + DHCP Cisco 1811 Router as the gateway 30 Windows XP DHCP clients on the LAN The problem: Some workstations are spontaneously switching to an incorrect DNS server. Specifically, ipconfig /all shows that they start using the gateway as a DNS server. This happens about 5-10 times a day to various computers, sometimes more than once per day. The workaround: Repairing the connection on the XP client always fixes the problem, and the correct DNS server address is obtained. We lost our main DNS/DHCP machine a week ago, and had to bring this one online as a spare. We've been having this issue since then. DHCP leases on the old and new servers are configured for "wired" (8 day) duration. There are definitely no other DHCP servers active on the LAN. So far there is no discernible pattern about which clients will show this problem, or when. When I ran DCDIAG /test:DNS it came back clean. Manual inspection of the DNS zone shows that all the records are appearing as expected, with no traces of the previous machine in there. Update Feb 27: Added screenshots. Here is a screenshot of the DHCP scope options on the 2008 R2 server. And here is a screenshot of ipconfig /all running on a healthy host. I don't have any ailing hosts at the moment, but will grab a screencap next time it happens. Update Feb 28: More screenshots. Here's a screenshot of DHCP and DNS traffic from a healthy client when repairing the local area connection. There's definitely only one server responding, but it does seem strange that the negotiation takes place twice. I'll try to get a similar capture from a sick machine this coming week. Update Mar 01: Caught a bad ipconfig. Here's a screenshot of ipconfig /all from a client that had this issue. It says the lease was issued this morning, but it doesn't even have an entry for the secondary DNS I set up yesterday. Both DNS servers were discovered properly when repairing the connection. Update Mar 01: It even got the sysadmin! This issue finally affected my personal workstation this morning. Unfortunately I had just rebooted and wasn't running a packet dump at the time. I set up a secondary server yesterday, and was logging all DNS traffic to it. My machine had not contacted the secondary DNS in over half an hour, so that says to me that it's just spontaneously reverting to the gateway without even failing over to secondary DNS first. Today I swapped the order of the DNS servers in DHCP, so the secondary is primary and vice versa. I will update again once I know how that goes.

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• Exempt programs from using active VPN connection

  - by Oxwivi

  When I connect to a VPN, all my network traffic is automatically routed through it. Is there a way to add exemptions to that? I don't know if adding exceptions has anything to do with the VPN protocol, but the VPN I'm using is of the OpenVPN protocol. Speaking of OpenVPN, why is it not installed by default on Ubuntu installs unlike PPTP? I could not get the list of IRCHighWay's servers, and this is the result I get trying to connect on XChat with running the bash script running: * Looking up irc.irchighway.net * Connecting to irc.irchighway.net (65.23.153.98) port 6667... * Connected. Now logging in... * You have been K-Lined. * *** You are not welcome on this network. * *** K-Lined for Open proxies are not allowed. (2011/02/26 01.21) * *** Your IP is 173.0.14.9 * *** For assistance, please email [email protected] and include everything shown here. * Closing Link: 0.0.0.0 (Open proxies are not allowed. (2011/02/26 01.21)) * Disconnected (Remote host closed socket). The IP 173.0.14.9 is the one due to my VPN. I had forgotten to check ip route list before running the script, and this is the one after running it: ~$ ip route list 99.192.193.241 dev ppp0 proto kernel scope link src 173.0.14.9 173.0.14.2 via 192.168.1.1 dev eth1 proto static 173.0.14.2 via 192.168.1.1 dev eth1 src 192.168.1.3 192.168.1.0/24 dev eth1 proto kernel scope link src 192.168.1.3 metric 2 169.254.0.0/16 dev eth1 scope link metric 1000 default dev ppp0 proto static Oh and running the script returned this output: ~$ sudo bash irc_route.sh Usage: inet_route [-vF] del {-host|-net} Target[/prefix] [gw Gw] [metric M] [[dev] If] inet_route [-vF] add {-host|-net} Target[/prefix] [gw Gw] [metric M] [netmask N] [mss Mss] [window W] [irtt I] [mod] [dyn] [reinstate] [[dev] If] inet_route [-vF] add {-host|-net} Target[/prefix] [metric M] reject inet_route [-FC] flush NOT supported I ran the script after connecting to the VPN.

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• Enforce VPN connection to access the Internet

  - by ch0wn

  I'm using a VPN when I'm online at an unencrypted wifi. Unfortunately, at my university the connection is quite unstable and at every reconnect the VPN connection is terminated and I manually need to reconnect to it using the NetworkManager, which obviously only works if I notice the reconnect. I enabled the option to automatically connect to the VPN in the NM options, but it seems to have no effect. Is there a way to enforce an active VPN connection before any other application can access the network connection so I can be sure not to send private data over unencrypted connections? Cheers, Pascal

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• Cisco VPN connection using CertStore as in Windows

  - by hsz

  Hello ! In Windows I was using Cisco VPN client to connect with VPN. In connection properties I set only hostname and choose certificate which are stored in C:\Program Files\Cisco Systems\VPN Client\Certificates. I moved yesterday to Ubuntu and I need to be able to connect with that host using those certificates too. I know that there is vpnc and network-manager-vpnc but it not allows (or I do not know about it) to set cerificates dir. Can someone tell me how to connect with VPN using certificates ?

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• VPN says "successfully connected" and I'm internet-connected, but I can't access network resources

  - by Al S.

  To explain, I'm a university student who uses the VPN to access sites like Nature, PhysicsToday, etc. I have this VPN working on Windows 7 and I've got access to nearly every journal. However on my Ubuntu 12.04 partition I'm able to connect to the internet (in fact I'm typing this while connected through the VPN presumably) but journals have locked me out. Is there a problem on my end that I can fix?

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