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• Port Forwarding for Remote Desktop

  - by Vaibhav Bajpai

  I have two Mac notebooks at home, I have assigned them static private IPs. I have also set my router to a DynDNS address, which updates everytime my router gets a new public IP. I have enabled Screen Sharing on both notebooks. I can successfully goto my router webpage using the DynDNS address. I understand I need to port-forward to get Screen Sharing to work from outside. Lets assume, notebooks have private IP 192.168.1.2 and 192.168.1.3 I am kind of lost here, would appreciate some help (I need to be able remote desktop to both notebooks)

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• setting up delegate or smtp forwarding

  - by cotiso

  for work we have a remote dedicated server to run our webservice that also runs our email services, at home(comcast residential internet) i cannot send mail using the dedicated server's SMTP, comcast spits back a error saying i can only use their SMTP server for sending mail at work(comcast business internet) we can use our dedicated server for sending mail with no problem so i set up a box at work to forward smtp traffic, i'm new to all this networking stuff by the way i used delegate to forward smtp traffic, can someone point me in the right direction on how to use this program(delegate) to fix our issue the delegate command i used to test is : delegated -P25 SERVER="smtp://dedicated.server.com:25" PERMIT=":::" -v i also opened up port 25 on the router so it points to my boxes ip are there any other ways to fool comcast into thinking im using my works ip to send mail, my coworkers and i are unable to send mail from home for some time now thanks

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• Web Service gets unavailable after several concurrent calls

  - by Roman

  We are testing GoDaddy Virtual Data Center and came to a very strange issue when our web site gets unavailable. GoDaddy Support keeps saying the issue is in our web server settings, but looking at the result of our tests I doubt it. TEST ENVIRONMENT Virtual DataCenter with Windows hosted at GoDaddy.com. All servers have Windows Server 2008 R2 Datacenter, IIS 7. Server One with IP address 10.1.0.4 Server Two with IP address 10.1.0.3 Both servers are in private network not visible from outside. Port Forward with IP address 50.62.13.174. Port Forward is assigned to Server One TEST DESCRIPTION JMeter is used as a Client App to simulate 30 concurrent users sending 100 SOAP requests each. Interval between requests is 1 second. Http link used for testing: http://50.62.13.174/v2/webservices.asmx TEST ONE Test is run from a computer in our office. After JMeter starts running test, almost immediately, the link above becomes unavailable in a browser. After test completion, the link is not available in a browser for about 5 more minutes. Remote Desktop is working well, so we can connect to Server One remotely. After about 5 minutes since test completion, the link becomes available in a browser again. TEST TWO Test is run from Server Two (that is part of our virtual data center). Test works very well, no visible delays in processing. The link is available in a browser all the time. TEST THREE Test is run from Server One using localhost. The result is the same as in TEST TWO - no issues. TEST FOUR We repeated TEST ONE from other computers that we have located in different countries, all with the same result as TEST ONE. CONCLUSION As the test works well from Server Two, but does not work from outside our virtual data center, we feel there are issues with the network or its capacity. The whole behaviour looks like out requests from outside get stuck somewhere before reaching our virtual data center. Has anybody had similar issues in the past? Are there chances that something is wrong with our server settings?

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• Why might one host be unable to access the Internet, when it can ping the router and when all other hosts can?

  - by user1444233

  I have a Draytek Vigor 2830n. It's kicking out a 192.168.3.0 LAN. It performs load-balancing across dual-WAN ports, although I've turned off the second WAN to simplify testing. There are many hosts on the LAN. All IPs are allocated through DHCP, most freely allocated from the pool, but one or two are bound to NIC MAC addresses. All hosts can access the Internet, save one. That host (192.168.3.100 or 'dot100' for short) gets allocated an IP address (and the right gateway address, DNS server addresses, subnet etc.) dot100 can ping itself. It can ping the gateway, and access the latter's web interface via port 80. It's responsive and loss-free (sustained ping over a couple of minutes reports no data loss). Yet, for some reason that evades me, dot100 can't ping an external IP address or domain name. I suspect it's never been able to, because it was getting some Internet access from a second adaptor (different subnet), but that's now been turned off, which exposed the problem. In dot100, I've tried: two operating systems (Windows 8 and Knoppix), to rule out anti-virus programs etc. two physical adaptors two cables, on each adaptor two IPs (e.g. .100 and .103 assigned by Mac and .26 from the pool) both dynamic and assigned (MAC-bound) DHCP-allocated IPs but none of this experiments yielded any variation in the result. dot100 is a crucial host. It's a file server for the network, so I need it to be reliably allocated a consistent IP. Can anyone offer a potential solution or a way forward with the analysis please? My guess My analysis so far leads me to believe it's a router issue. I've checked the web interface very carefully. There are no filters setup in Firewall - General Setup or Filter Setup. I suspect it's a corrupted internal routing table, but the web UI shows this as the Routing table: Key: C - connected, S - static, R - RIP, * - default, ~ - private * 0.0.0.0/ 0.0.0.0 via 62.XX.XX.X WAN1 * 62.XX.XX.X/ 255.255.255.255 via 62.XX.XX.X WAN1 S 82.YY.YYY.YYY/ 255.255.255.255 via 82.YY.YYY.YYY WAN1 C 192.168.1.0/ 255.255.255.0 directly connected WAN2 C~ 192.168.3.0/ 255.255.255.0 directly connected LAN2

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• Configuring a Unified Communications Certificate for many virtual hosts running in Jetty

  - by rrc7cz

  I have a single IP with Jetty serving up X sites on port 80. Basically you can sign up for our service, then point your domain www.mycompany.com to that IP, and Jetty will serve up your custom site. I would like to add SSL support for all sites. To simplify things, I've looked at getting a single Unified Communications Certificate to plug into Jetty and have it work for all sites. Is this possible? Has anyone done this before? Does Jetty only support traditional, single-domain certs? What issues might I run in to compared to a single-domain cert?

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• cannot connect to MS FTP 7.5 on Windows 2008 on Amazon EC2 instance

  - by minerj

  I have just installed the MS FTP 7.5 upgrade on my Windows 2008 Server (Service Pack 2) running on an Amazon EC2 instance. In the FTP Firewall Support settings for the server in IIS Manager I have set up the passive port range 45001 - 45005 and also set the External Firewall IP address to match the assigned Amazon Elastic IP address. Using the AWS Console I changed the Security Group for the server to allow access to the server through ports 21 and 45001 through 45005. Using an FTP client (either the command line FTP client or Windows Explorer) on the Amazon server I can connect to the FTP server but I cannot connect with an external FTP client. When I checked to see which ports were open on the server using Shields Up it shows that port 21 is open but ports 45001 to 45005 are closed. I assume I'm missing something. Any help greatly appreciated.

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• Can a Windows 2003 Active Directory server act as a NTP server?

  - by Rob Nicholson

  Within our LAN, there are two Windows 2003 servers with the Active Directory role. Both these servers have the time service configured to query NTP servers on the internet for the accurate time. That works fine. I've just installed XenServer v5.6 and it's asked me for the IP address of an NTP server. Without tweaking the firewall, I cannot configure this server to reference an internet based NTP server. But can I configure it to use the IP address of the internal AD servers, i.e. do AD servers also act as NTP servers to other computers? Thanks, Rob.

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• Why is this static routing not working ?

  - by geeko

  Greeting gurus, I'm trying to develop a DHCP enforcement extension like Microsoft NAP. My trick to block dynamic-IP requesting machines (that don't meet certain policy) is to strip the default gateway (no default gateway) stated in the IP lease and set the lease subnet mask to 255.255.255.255. Now I need the blocked machines to be able to reach some specific locations (IPs) on the network. To allow for this, I'm including some static routes in the lease. For example, I'm including 10.10.10.11 via router 10.10.10.254 (the one to which the blocked machine that needs to access 10.10.10.11 is connected). Unfortunately, as soon as I set the default gateway to nothing, blocked machines cannot reach any of the added static routes. I also tried classless static routes. Any ideas ? any one knows how MS NAP actually do it ? Geeko

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• is there any Open Soruce solution for Failover of incoming Traffic?

  - by sahil

  Hi, We have two ISP... and both ISP's Ip Nat with same Webserver IP, i want failover for incoming traffic , is there any open source solution? can i do it by making two name server , one for each ISP? ... I am not sure but as per my knowledge primary and secondary name server will reply in round robin method till they are live , once any name server will be unreachable then only another will be reply...so if i am right then i think i can do incoming failover by making two name server in my office... Waiting for your valuable response... Thanking you, Sahil

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• How do http proxies determine https traffic with a single port?

  - by badunk

  If a proxy receives the tcp packet, then the destination ip address and port are that of the proxy. In that case, I imagine the only way a proxy can still resolve the intended destination is either through routing the source ip address/port or through the host field in the http header. Is this correct? In both Fiddler and Charles http proxies, I noticed that the tool accepts both http and https connections through a single port that you can specify. What do these tools do to tell the difference between the two types of connections?

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• cannot access my own computer through My Network Places

  - by vgv8

  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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• What equipment do real ISP's use?

  - by Allanrbo

  In a dormitory of 550 residents, people often mistakenly set up DHCP servers for the whole network by plugging in their private Wi-Fi routers wrongly. Also recently, someone mistakenly configured their PC to a static IP being the same as that of the default gateway. We use cheap 3Com switches at the moment. I know that Cisco switches support DHCP snooping to solve the DHCP problem, but that still does not solve the default gateway IP takeover problem. What sort of switch equipment do real ISP's use so their customers cannot break the network for the other customers? What we ended up doing In case anyone are courious, we ended up doing seperate VLANs for each user. And as a matter of fact, not just the 550 users, but for 2500 users (11 dorms). Here's a page describing the setup: http://k-net.dk/technicalsetup/ (the section "Transparent firewall using VLANs"). There was no significant load on the router server as I feared in one of the comments below. Even at 800Mpbs.

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• Get source and destination of outbound traffic in pfSense

  - by maxsilver

  I'm looking at the traffic graph in pfSense (Version 1.2.2), which we're using as a router / NAT / ect on our network. Recently, I'm seeing a sudden, constant spike of 15 - 30kbps traffic outbound, that is unusual for our network (normally its below 2kbps, we're mostly all inbound traffic) Is there any way to determine what the source of this traffic is, or where it's going? (Just an internal IP address for source, and external IP address for destination would be all I need) I've already tried switching the traffic graph to 'LAN' and watching the host list on the right side, but it seems ... flakey. The numbers it shows seem to fade in and out at random, and the values never add up to anywhere near the graph values. I'm not allowed to post the image, but a photo is available at - http://imgur.com/QYjKI.png

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• Alternate port numbers for Supermicro IPMI View software

  - by MC9000

  I'm using the IPMI View software to manage a SuperMicro server but would like to use alternate port #s within the program itself. In other words - If I use the web browser, it defaults to port 80 - While I can, say change that port to 12345 (or whatever) and type the IP address into the browser (like http://xxx.xxx.xxx.xxx:12345 ) that works just fine. However, in IPMIView, it will assume port 80 and load the browser with the IP (which, naturally, won't work, so I have to manually type in the alternate port #). I can deal with that. The clincher is if I use a port other than 623 for management - (say 55623 for example), the IPMIView will not find it. Same goes for the iKVM port #. Is there some place to specify this (to tell IPMIView to use the alternate port numbers), like a settings file? I'm running this from a Windows client.

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• PPTP VPN Not Working - Peer failed CHAP authentication, PTY read or GRE write failed

  - by armani

  Brand-new install of CentOS 6.3. Followed this guide: http://www.members.optushome.com.au/~wskwok/poptop_ads_howto_1.htm And I got PPTPd running [v1.3.4]. I got the VPN to authenticate users against our Active Directory using winbind, smb, etc. All my tests to see if I'm still authenticated to the AD server pass ["kinit -V [email protected]", "smbclient", "wbinfo -t"]. VPN users were able to connect for like . . . an hour. I tried connecting from my Android phone using domain credentials and saw that I got an IP allocated for internal VPN users [which I've since changed the range, but even setting it back to the initial doesn't work]. Ever since then, no matter what settings I try, I pretty much consistently get this in my /var/log/messages [and the VPN client fails]: [root@vpn2 ~]# tail /var/log/messages Aug 31 15:57:22 vpn2 pppd[18386]: pppd 2.4.5 started by root, uid 0 Aug 31 15:57:22 vpn2 pppd[18386]: Using interface ppp0 Aug 31 15:57:22 vpn2 pppd[18386]: Connect: ppp0 <--> /dev/pts/1 Aug 31 15:57:22 vpn2 pptpd[18385]: GRE: Bad checksum from pppd. Aug 31 15:57:24 vpn2 pppd[18386]: Peer armaniadm failed CHAP authentication Aug 31 15:57:24 vpn2 pppd[18386]: Connection terminated. Aug 31 15:57:24 vpn2 pppd[18386]: Exit. Aug 31 15:57:24 vpn2 pptpd[18385]: GRE: read(fd=6,buffer=8059660,len=8196) from PTY failed: status = -1 error = Input/output error, usually caused by unexpected termination of pppd, check option syntax and pppd logs Aug 31 15:57:24 vpn2 pptpd[18385]: CTRL: PTY read or GRE write failed (pty,gre)=(6,7) Aug 31 15:57:24 vpn2 pptpd[18385]: CTRL: Client 208.54.86.242 control connection finished Now before you go blaming the firewall [all other forum posts I find seem to go there], this VPN server is on our DMZ network. We're using a Juniper SSG-5 Gateway, and I've assigned a WAN IP to the VPN box itself, zoned into the DMZ zone. Then, I have full "Any IP / Any Protocol" open traffic rules between DMZ<--Untrust Zone, and DMZ<--Trust Zone. I'll limit this later to just the authenticating traffic it needs, but for now I think we can rule out the firewall blocking anything. Here's my /etc/pptpd.conf [omitting comments]: option /etc/ppp/options.pptpd logwtmp localip [EXTERNAL_IP_ADDRESS] remoteip [ANOTHER_EXTERNAL_IP_ADDRESS, AND HAVE TRIED AN ARBITRARY GROUP LIKE 5.5.0.0-100] Here's my /etc/ppp/options.pptpd.conf [omitting comments]: name pptpd refuse-pap refuse-chap refuse-mschap require-mschap-v2 require-mppe-128 ms-dns 192.168.200.42 # This is our internal domain controller ms-wins 192.168.200.42 proxyarp lock nobsdcomp novj novjccomp nologfd auth nodefaultroute plugin winbind.so ntlm_auth-helper "/usr/bin/ntlm_auth --helper-protocol=ntlm-server-1" Any help is GREATLY appreciated. I can give you any more info you need to know, and it's a new test server, so I can perform any tests/reboots required to get it up and going. Thanks a ton.

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• Oracle RAC interconnect in a Dell M1000e Blade Enclosure

  - by Antitribu

  We are looking at a Dell M1000e enclosure and appropriate Blades with 4 NICs each. We are planning on running Linux/Oracle 11g RAC on two blades, storage will be handled on an iSCSI SAN for which two NICs (via passthrough) will be connected leaving us with two NICs (via blade centre switches). We would like to have an interconnect (obviously) , an external IP and an internal IP. Would best practice be to: bond the remaining two interfaces and VLAN as appropriate to provide three virtual interfaces? run the interconnect on one interface and VLAN the external/internal interfaces? purchase a blade with more NICs as the above is a terrible idea? Another option? Please feel free to point out the blindingly obvious or to relevant documentation on support.oracle. I am specifically interested in supported configurations and best practices. Thanks!

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• Setting up DNS in WHM/cPanel

  - by Jon Furmanski

  I don't understand what I'm doing wrong, but I'm sure this is a simple fix. I setup WHM/cPanel for the first time on my VPS and understand how DNS works for the most part (or so I thought). I created under the main domain name 2 nameservers (ns1.maindomain.com & ns2.maindomain.com). I have 2 IP address for my sever so each one points to a unique IP: ns1.maindomain.com => 198.x.x.204 ns2.maindomain.com => 198.x.x.205 I also set up reverse DNS with my hosting provider. When I put in my two nameservers under another domain (secondary domain), GoDaddy states that the nameservers are invalid. Any ideas on why this is or any configurations in cPanel that need to be made?

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• Exchange 2007: relay only from selected servers based on rDNS

  - by Frank

  I'm looking for a way to make Exchange 2007 only accept mail from a certain group of hosts. These hosts all use the same identifying rDNS entry. Exchange 2003 uses a whitelist based on the reverse DNS, there we could add the hostname to the to the "Domain" field. However, in Exchange 2007 this option seems to be removed. Is there a way to do this? IP's however tend to change. These changes can occur at any time, and it is impossible to keep all the servers up-to-date to the new IP's. Running a script that resolves the hostname and whitelists them accordingly is my last-resort option, but this is not fool-proof. Does anyone know whether this is possible and if so, how? Thanks!

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• Why does DNS work the way it does?

  - by sabof

  This is a Canonical Question about DNS (Domain Name Service). If my understanding of the DNS system is correct, the .com registry holds a table that maps domains (www.example.com) to DNS servers. What is the advantage? Why not map directly to an IP address? If the only record that needs to change when I am configuring a DNS server to point to a different IP address, is located at the DNS server, why isn't the process instant? If the only reason for the delay are DNS caches, is it possible to bypass them, so I can see what is happening in real time?

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• AWS ELB as backend for Varnish Accelerator

  - by addisonj

  I am working on a large deployment on AWS that has high uptime requirements and variable loads throughout the day. Obviously, this is the perfect use case for ELB (Elastic Load Balancer) and autoscaling. However, we also rely on varnish for caching of API calls. My initial instinct was to structure the stack so that varnish uses ELB as a backend which in turn hits an appGroup. Varnish -> ELB -> AppServers However, according to a few sources that isn't possible as ELB constantly changes the IP address of its DNS hostname, which varnish caches on start, meaning changes to the IP won't be picked up by varnish. Reading around however, it looks like people are doing this so I am wondering what workarounds exist? Perhaps a script to reload the vcl periodically? In the case of where this is really just not a good idea, any idea of other solutions?

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• Just one client bound to address and port: does it make a difference broadcast versus unicast in terms of overhead?

  - by chrisapotek

  Scenario: I am implementing failed over for a network node, so my idea is to make the master node listens on a broadcast ip address and port. If the master node fails, another failover node will start listening on this broadcast address (and port) and take over. Question: My concern is that I will be using a broadcast IP address just for a single node: the master. The failover node only binds if the master fails, in other words, almost never. In terms of network/traffic overhead, is it bad to talk to a single node through a broadcast address or the network somehow is smart enough to know that nobody else is listening to this broadcast address and kind of treat it as a unicast in terms of overhead? My concern is that I will be flooding my network with packets from this broadcast address even thought I am just really talking to a single node (the master). But I can't use unicast because the failover node has to be able to pick up the master stream quickly and transparently in case it fails.

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• Ubuntu with KVM guest VM and broken bridges

  - by MadPsy

  I have an Ubuntu box with a KVM guest VM running. They use bridging so the guest VM attaches to the physical network of its host. The guest VM has 2 NICs in 2 different bridges. First NIC of the VM is tap5 and is in bridge br0 br0 8000.46720f5c572e no eth0.500 tap5 Second NIC of the VM is tap2 and is in bridge br100 br100 8000.76ad2fc96661 no eth0.100 eth0.101 eth0.103 eth0.104 eth0.105 tap2 On the host, br0 has an IP and br100 does not 21: br0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP link/ether 46:72:0f:5c:57:2e brd ff:ff:ff:ff:ff:ff inet 192.168.100.4/24 brd 192.168.10.255 scope global br0 inet6 fe80::d6ae:52ff:febe:777/64 scope link valid_lft forever preferred_lft forever On the guest, its eth0 and eth1 interfaces both have IP addresses 2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000 link/ether 00:3e:61:fb:7a:da brd ff:ff:ff:ff:ff:ff inet 192.168.100.6/24 brd 192.168.100.255 scope global eth0 inet6 fe80::23e:61ff:fefb:7ada/64 scope link valid_lft forever preferred_lft forever 3: eth1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000 link/ether 00:3e:61:fb:7a:ea brd ff:ff:ff:ff:ff:ff inet 172.16.50.129/25 brd 172.16.50.255 scope global eth1 inet6 fe80::23e:61ff:fefb:7aea/64 scope link valid_lft forever preferred_lft forever On the guest VM, a tcpdump of its eth1 interface (tap2) shows traffic from its eth0 interface (tap5), as if the 2 bridges are themselves bridged. This means any interface on br100 is now bridged across to br0 - which is completely broken. root@chillispot:~# tcpdump -c 1 -n -v -i eth1 net 192.168.100.0/24 tcpdump: listening on eth1, link-type EN10MB (Ethernet), capture size 65535 bytes 16:31:24.175583 IP (tos 0x0, ttl 64, id 48054, offset 0, flags [DF], proto TCP (6), length 148) 192.168.100.6.22 > 192.168.100.4.59505: Flags [P.], cksum 0x6c2b (correct), seq 1056321648:1056321744, ack 398642983, win 1700, options [nop,nop,TS val 197473436 ecr 200655363], length 96 What could be bridging the 2 bridges, except the guest VM (which is a stock Ubuntu install)? I am at a complete loss! Thanks.

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• Failed reverse DNS and SPF only when using Thunderbird!

  - by TruMan1

  I have a reverse DNS and SPF records correctly setup for my mail server. Sending webmail from it works perfect. The problem is when Thunderbird sends out emails, it is using the client's IP address for the hostname. I have SMTP authentication and specified my mail server's as the outgoing SMTP. Mail is being sent, but it is not "signing" the email with the mail server's IP address.. it is using the client's. Is there any way to fix this? This is the spam error I get when sending from Thunderbird: Spam: Reverse DNS Lookup, SPF_SoftFail

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• FTP error 424 failed to establish connection

  - by cKK

  Getting "ftp error 425 failed to establish connection" when trying to connect to ftp server. Tried 2 ftp clients on 3 machines on same network and none work. However FTP works from home / mobile broadband. No ip blocks on ftp sever. Other ftp servers(differrent ip/hosts) work okay. firewall setup correct, no ports blocked. Is it possible to use a proxy for ftp a i think it's something with the ISP but taking too long to fix?

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• How to do networking between virtual machines in VirtualBox?

  - by Sanoj

  I have two virtual machines in VirtualBox. I would like to do networking between them. For the moment I have the default configuration on both, but they seams to have the same IP-address 10.0.2.15. I would also like to be able to use Internet with both, and that is Possible now. By default the network-setting is NAT, but I seams like they cannot network internally since they have the same IP. But If I change to internal networking I guess that I cannot access Internet with the virtual machines. How can I set up networking between virtual guest AND have access to Internet on them?

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