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• Why Mac cannot connect to Iphone?

  - by martin08

  I couldn't always ssh to my iPhone from my Mac. They're both on the same wifi network but sometimes the connection is established, sometimes it failed. From my Mac: $ ssh [email protected] ssh: connect to host 192.168.0.102 port 22: Operation timed out $ ping 192.168.0.102 PING 192.168.0.102 (192.168.0.102): 56 data bytes ping: sendto: No route to host ping: sendto: Host is down ping: sendto: Host is down I enabled SSH on the phone and am sure it can load webpages. So what might be a reason why they cannot connect? Thanks

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• How do the routers communicate with each other ?

  - by Berkay

  Let's say that i want make a request a to a web page which is hosted in Europe (i live in USA).My packets only consist the IP address of the web page, first the domain name to ip address transformation is done, then my packets start their journey through to europe. i assume that MAC addresses never used in this situation? are they? First, my packets deal with many routers on way how these routers communicate with each other?, are router addresses added to my packet headers ? Second, is there a specific path router to router comminication or which conditions affect this route? Third to cross the Atlantic Ocean, are cables used or... ?

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• Can't connect to wireless-n in dual mode.

  - by Tyllyn

  I recently purchased a Acer Aspire Revo AR3610-U9022. This little nettop uses a Atheros AR5B91 Wireless Network Adapter. I also have a Netgear RangeMax NEXT Wireless Route (model WNDR3300). I have been using this router in dual mode (11G and 11N) on my normal desktop without a problem (Mode: Up to 270Mbps at 5GHz & 54Mbps at 2.4 GHz), but doing this, my Revo won't detect the 11N network as being around... my desktop still does, but the Revo, nope... just the 11G. However, when I switch my router over to just "Up to 270Mbps at 2.4GHz", it kills the 11G entirely, but the Revo recognizes the 11N network. I'm a programmer by trade, and this hardware-y stuff confuses me more than it should. Is there any way that I could set this stuff up so my Revo can connect to the 11N part of my router, but keep the 11G around? :) Thanks!

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• Distributing entropy to virtual machines.

  - by Louis

  Dear All, I'm interested in generating secret keys for SSL on virtual machines using true randomness. By true randomness I mean the same level of entropy that can be generated by UNIX's dev/random and entropy gathering daemon (EGD). Is there a "general knowledge" recipe to route entropy from the physical layer to the virtual machines via the hypervisor regardless of the Hypervisor/Guest OS combination? Example: suppose one "hypervises" with VMware VSphere and instantiates Windows Guest OS. Can this hypervisor collect entropy from its peripherals (like dev/random/ would) and distribute it to these guest Windows OS? When considering the big vendors (VMware, Hyper-V, Citrix, etc), do they have entropy pools that gather entropy that can easily be pushed to their respective virtual machines? Louis

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• How do you implement NAT-T passthrough on a Juniper SRX series Firewall?

  - by Chris

  We have 3 juniper SRX-100 firewalls, they are configured like so: FW1 - FW2 - INTERNET - FW3 We would like to create an IPSEC tunnel between FW3 and FW1 passing through FW2 preferably using NAT-T. Is this possible? FW1 and FW2 have some strict access rules only allowing 1 port connected (it's a DMZ with a server in) so we can't just create a route based vpn between FW1 and FW2 to forward the traffic (otherwise all traffic will be forwarded) We know the tunnel is fine because we have managed to test it between FW1 and FW3 (without FW2 in the middle) so we know that the issue is to do with the 'passthrough' on FW2. Essentially, the question is - What options do we need to select on FW2 to enable it to pass through the IPSEC traffic straight to FW1? Many thanks in advance

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• Setting up SVN+SSH for multiple users through one local user.

  - by Warlax

  Hi, I need to make our SVN repository accessible through the firewall - but without creating a local user for each potential external user. Instead, I would like to set-up SVN+SSH to route all external users through a single local user name. We would like each external user to authenticate with SSH the regular way but then treat their instance of svnserve as if they're all that single local user and possibly, control what parts of the repository each external user can access. I know that I will need to set my svnserve config according to the official guide. I tried, but the instructions are fuzzy and I am relatively a Linux n00b. What exactly are the steps to proceed? and how would you go about testing this? Thanks for your help.

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• How do I host multiple SSL websites on a single EC2 instance using Amazon Elastic Load Balancers?

  - by Developr

  If I have 3 separate websites which all require SSL (separate certificates) that I want to host on the same EC2 instance(s) across multiple availability zones so that we have the ability to scale and be highly available, how do I achieve this using ELBs in my Amazon VPC? Each site requires a separate IP address, so I have added multiple private IPs to the EC2 instance, but I am unsure how to bind the ELB to a certain IP on the instance. I was also able to setup multiple ELB pointing to the same instance, but again, I am not seeing any way to bind each ELB to a separate IP on the instance. If this is not possible, what is the best option? Run each site on a separate EC2 instance / ELB combo (expensive and harder to maintain) Give each site a separate public IP and use Route 53 to do the load balancing (seems like a hack) Use a different load balancer option such as HAProxy that should be able to work like a normal load balancer appliance. Please help!

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• SSH tunnel RDP through gateway server outside the network?

  - by Mike

  I need to access a PC via RDP that is behind a firewall. There's no way to connect to it directly that I know of. What I'd like to do is SSH from that remote PC to my home Ubuntu server, then connect to the remote PC using my home PC with the Ubuntu server as a gateway. I've tried SSH from remote PC to Ubuntu server, tunneling remote port 3389 to 127.0.0.1:3389, then SSH from home PC to Ubuntu server, tunneling local port 13389 to remote port 3389. At that point I try to RDP into: 127.0.0.1:13389, 127.0.0.2:13389, :3389 - no dice. I suppose I could simply set up an SSH server on my home PC and SSH from remote PC into home PC and then establish the tunnel that way, but I'd rather not go through the hassle of installing and configuring an ssh server on my home PC. I know LogMeIn would work here, but I don't want to go that route for various reasons. Any ideas? Thanks!

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• firehol (firewall) with bridge: how to filter

  - by Leon

  I have two interfaces: eth0 (public address) and lxcbr0 with 10.0.3.1. I have a LXC guest running with ip 10.0.3.10 This is my firehol config: version 5 trusted_ips=`/usr/local/bin/strip_comments /etc/firehol/trusted_ips` trusted_servers=`/usr/local/bin/strip_comments /etc/firehol/trusted_servers` blacklist full `/usr/local/bin/strip_comments /etc/firehol/blacklist` interface lxcbr0 virtual policy return server "dhcp dns" accept router virtual2internet inface lxcbr0 outface eth0 masquerade route all accept interface any world protection strong #Outgoing these protocols are allowed to everywhere client "smtp pop3 dns ntp mysql icmp" accept #These (incoming) services are available to everyone server "http https smtp ftp imap imaps pop3 pop3s passiveftp" accept #Outgoing, these protocols are only allowed to known servers client "http https webcache ftp ssh pyzor razor" accept dst "${trusted_servers}" On my host I can connect only to "trusted servers" on port 80. In my guest I can connect to port 80 on every host. I assumed that firehol would block that. Is there something I can add/change so that my guest(s) inherit the rules of the eth0 interface?

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• Certain users cannot get to my server

  - by Zeno

  I am finding more and more users that report they cannot reach my server (website or services). Their tracert from that user looks like this: Tracing route to domain.com [*.*.*.255] over a maximum of 30 hops: 1 * * * Request timed out. The server is up and functional and every else reports it is fine. But there are various users who cannot get to it. I have no firewall or anything that would block anyone. Yes, the last part of the server IP is 255. Could this be causing it? http://www.dslreports.com/forum/r18539206-Last-octet-255-bug-on-Windows Or would a certain ISP be denying traffic to my server? Or something on their router level?

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• BT socket Device over Structured Cabling

  - by TheD

  Not sure if this is the right stack* site to post on but I believe cabling is a just subject. Essentially I have a Credit Card machine which is connected to a phone line via standard BT Socket. So basically, the port of the wall has a balun plugged in which takes the RJ45 outlet on the wall to BT, so I can plug the device in. This works fine, however I need the machine to be on the other side of the room so want to route it through my patch panel (strucutered cabling). How can this be done? So Device -- ? -- RJ45 port -- Patch Panel -- ? -- Balun out wall outlet Where ? is to be filled in ! :)

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• Setting up routing for MS DirectAccess to a VMWare EsXi Host

  - by Paul D'Ambra

  I'm trying to set up DirectAccess on a virtual machine so I can demonstrate it's value and then if need be add a physical machine to host it. I'm hitting a problem because the Direct Access machine (DA01) needs to have 2 public addresses actually configured on the external adapter but there is a Zyxel Zywall USG300 between the VMware ESXi host and the outside world. I've summarised my setup in this diagram If I ping from the LAN to 212.x.y.89 I get a response but if I ping from the VM I get destination host unreachable. I used "route add 212.x.y.89 192.c.d.1" and get request timed out. At that point I see outbound traffic allowed on the Zyxel firewall but nothing coming back. I'm past my understanding of routing and VMWare so am not sure how to tie down where my problem lies (or even if this setup is possible). So any help massively appreciated. Paul

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• Swapping 3Ware Raid Card - Best Procedure

  - by Brian Lee Jackson

  We have a server running an old firmware version and driver (just took this position) on the 3Ware 9650SE Raid Controller... We have been having issues with the server and seemed to have narrowed it down to the Raid Card... I will be replacing the Raid card with the same model of 3Ware 9650SE, however, the card ordered most likely will have newer firmware on it. I managed to backup all the data to a very large drive. My plan is to update the firmware/driver on the current setup (which is still booting) and verify that everything works.. Then throw in the new Raid Card, check the firmware version (not letting it post). And update to newest firmware if needed via Java management utility on the card? Is this the best route? Thanks!

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• Internal+external interfaces with multiple default gateways on win2003

  - by fileitup

  Im trying to set up several web servers for a load balanced cluster and need to have each server connected to the internal network (for load balancing) as well as to an external network (internet - for administration). I have two NICs but since I cant set two default gateways I have the external gateway as default and the internal as a route rule. This setup only works half way - the internal network is fine but I cant log in from outside or see the web from the box. If I switch the gateways remote login/web will work, but the internal wont. Im sure someone encountered this before but wasnt able to find anything online. Any help will be appreciated.

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• Proxmox 31 + KVM routing + IP subnet + csf

  - by KeyJey

  We have proxmox 3.1 server in netzner with routuing network and IP subnet block. We want to implement csf firewall without interfering the traffic of the KVM VMs, what would be the easiest way? We readed that we should add this lines to /etc/csf/csfpost.sh: iptables -A FORWARD -d 144.76.223.155 -j ACCEPT iptables -A FORWARD -d 144.76.223.156 -j ACCEPT iptables -A FORWARD -d 144.76.223.157 -j ACCEPT iptables -A FORWARD -d 144.76.223.158 -j ACCEPT iptables -A FORWARD -d 144.76.223.159 -j ACCEPT iptables -A FORWARD -d 144.99.183.323 -j ACCEPT But when we enable csf the ping breaks, this is the network config (IPs are modified): auto lo iface lo inet loopback # device: eth0 auto eth0 iface eth0 inet static address 144.76.166.100 netmask 255.255.255.255 pointopoint 144.76.183.97 gateway 144.76.183.97 # for single IPs auto vmbr0 iface vmbr0 inet static address 144.76.166.100 netmask 255.255.255.255 bridge_ports none bridge_stp off bridge_fd 0 up ip route add 144.99.183.323/32 dev vmbr0 # for a subnet auto vmbr1 iface vmbr1 inet static address 144.76.166.100 netmask 255.255.255.248 bridge_ports none bridge_stp off bridge_fd 0 Thanks in advanced ! :)

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• CISCO 2911 Router configuration

  - by bala

  Device cisco 2911 router configuration support is required please. I have exchange server 2010 configured and working without any errors the problem is in cisco router configuration when exchange server sends emails out the receives WAN IP not the public ip. I have configured RDNS lookups with our MX record IP addesses that match the FQDN but all our emails are rejected because it does not match with the public ip. Receiving mails problem is not an problem all mails are coming through. i am sure i am missing something on the router configuration that does not sends the public ip, can any one help me to solve this issue. Note; I've got 1 WAN IP & 8 Public IP from ISP . Find below the running configuration. Building configuration... Current configuration : 2734 bytes ! ! Last configuration change at 06:32:13 UTC Tue Apr 3 2012 ! NVRAM config last updated at 06:32:14 UTC Tue Apr 3 2012 ! NVRAM config last updated at 06:32:14 UTC Tue Apr 3 2012 version 15.1 service timestamps debug datetime msec service timestamps log datetime msec service password-encryption ! hostname BSBG-LL ! boot-start-marker boot-end-marker ! ! enable secret 5 $x$xHrxxxxx5ox0 enable password 7 xx23xx5FxxE1xx044 ! no aaa new-model ! no ipv6 cef ip source-route ip cef ! ! ! ! ! ip flow-cache timeout active 1 ip domain name yourdomain.com ip name-server 213.42.20.20 ip name-server 195.229.241.222 multilink bundle-name authenticated ! ! crypto pki token default removal timeout 0 ! ! license udi pid CISCO2911/K9 ! ! username bsbg ! ! ! ! ! ! interface Embedded-Service-Engine0/0 no ip address shutdown ! interface GigabitEthernet0/0 ip address 192.168.0.9 255.255.255.0 ip flow ingress ip nat inside ip virtual-reassembly in duplex auto speed 100 no cdp enable ! interface GigabitEthernet0/1 ip address 213.42.xx.x2 255.255.255.252 ip nat outside ip virtual-reassembly in duplex auto speed auto no cdp enable ! interface GigabitEthernet0/2 no ip address shutdown duplex auto speed auto ! ip forward-protocol nd ! no ip http server no ip http secure-server ! ip nat inside source list 120 interface GigabitEthernet0/1 overload ip nat inside source static tcp 192.168.0.4 25 94.56.89.100 25 extendable ip nat inside source static tcp 192.168.0.4 53 94.56.89.100 53 extendable ip nat inside source static udp 192.168.0.4 53 94.56.89.100 53 extendable ip nat inside source static tcp 192.168.0.4 110 94.56.89.100 110 extendable ip nat inside source static tcp 192.168.0.4 443 94.56.89.100 443 extendable ip nat inside source static tcp 192.168.0.4 587 94.56.89.100 587 extendable ip nat inside source static tcp 192.168.0.4 995 94.56.89.100 995 extendable ip nat inside source static tcp 192.168.0.4 3389 94.56.89.100 3389 extendable ip nat inside source static tcp 192.168.0.4 443 94.56.89.101 443 extendable ip nat inside source static tcp 192.168.0.12 80 94.56.89.102 80 extendable ip nat inside source static tcp 192.168.0.12 443 94.56.89.102 443 extendable ip nat inside source static tcp 192.168.0.12 3389 94.56.89.102 3389 extendable ip route 0.0.0.0 0.0.0.0 213.42.69.41 ! access-list 120 permit ip 192.168.0.0 0.0.0.255 any ! ! ! control-plane ! ! ! line con 0 exec-timeout 5 0 line aux 0 line 2 no activation-character no exec transport preferred none transport input all transport output pad telnet rlogin lapb-ta mop udptn v120 ssh stopbits 1 line vty 0 4 password 7 xx64xxD530D26086Dxx login transport input all ! scheduler allocate 20000 1000 end

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• External routing for local interfaces in a virtualized network

  - by Arkaitz Jimenez

  Current setup: br0| |-- tun10 -pipe-tun0(192.240.240.1) |-- tun11 -pipe-tun1(192.240.240.2) |-- tun12 -pipe-tun2(192.240.240.3) The pipe program is a custom program that forwards data back2back between two tun interfaces. The idea is puting 2 programs in .2 and .3 while keeping .1 as the local interface in the current machine. The main problem is that I want to route packets to .2 and to .3 through .1 and br0, but as they are local interfaces, the kernel ignores any routing instruction, it just delivers the packet to the proper interface. Tried iptables, but the nat table doesn't even see ping packets to those ifaces. A "ping 192.240.240.2" delivers a icmp packet with source and dest .2 to tun1, ideally it should deliver a source .1 dest .2 at tun1 through tun0-br0-tun1 Any hint? Here the output of some commands: Output

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• Trying to set up OpenVPN server on a vps

  - by Austin

  I'm trying to set up an OpenVPN server on my VPS for myself when I'm in public places, using this tutorial, http://tipupdate.com/how-to-install-openvpn-on-ubuntu-vps/ However whenever I try to start the server, it gives me this, root@vps:~# /etc/init.d/openvpn start * Starting virtual private network daemon(s)... * Autostarting VPN 'server' [fail] The log contains this Tue Dec 11 10:53:32 2012 Diffie-Hellman initialized with 1024 bit key Tue Dec 11 10:53:32 2012 /usr/bin/openssl-vulnkey -q -b 1024 -m <modulus omitted> Tue Dec 11 10:53:33 2012 TLS-Auth MTU parms [ L:1542 D:138 EF:38 EB:0 ET:0 EL:0 ] Tue Dec 11 10:53:33 2012 ROUTE: default_gateway=UNDEF Tue Dec 11 10:53:33 2012 Note: Cannot open TUN/TAP dev /dev/net/tun: No such file or directory (errno=2) Tue Dec 11 10:53:33 2012 Note: Attempting fallback to kernel 2.2 TUN/TAP interface Tue Dec 11 10:53:33 2012 Cannot allocate TUN/TAP dev dynamically Tue Dec 11 10:53:33 2012 Exiting So obviously it's something to do with the tun, but I don't understand how to fix it. Thanks!

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• OpenBSD in a virtual box as a firewall

  - by Ali

  Is there any merit in installing a virtual machine with OpenBSD and pf (or any other simple and secure OS + iptable) on a mac laptop and routing all the traffic through that machine? I read a similar set up for corporate laptops running windows (I thing I read this in BSD magazine). They claim that Windows machines are too hard to secure and if you are taking them to the wild (public wireless, hotels, ...) you'd better but a secure OS in between! If you think this is a good idea, how you route all the traffic on a mac through the virtual machine and prevent any application or service to go directly? I am not sure if just setting the gateway will do that, what about DNS? you don't want anybody to fool you with DNS cache poisoning or similar attacks either.

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• W2k8 RC1: Windows Media Servers (WMS) as proxy

  - by da_didi

  (fullquote from stackoverflow.com/questions/2690788/w2k8-rc1-windows-media-servers-wms-as-proxy/2690791#2690791) I will have one streaming-server (W2k8, unknown streaming protocol [rtsp, mss, http]) and half dozen streaming-servers as proxies to save bandwidth. I have read the documentation and installed the modules, but I am unsure how I have to configure the proxy's according to http://technet.microsoft.com/de-de/library/ee126142(en-us,WS.10).aspx - as a proxy or reverse proxy and how I minimize the bandwidth needs between origin server and proxy's. What is the best way to realize my setup? Any short how-tos? How can I announce all players to use the proxy? Route all rtsp/mms/http-requests through my proxy? Announce the proxy with DHCP-releases? Thanks!

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• GNS3 Cannot ping/resolve DNS record

  - by Eldad Cohen

  I set up an internet lab with GNS3, which has 3 routers, in each node there is a computer directly connected. One of the hosts is a DNS server, Windows 2003 Server. The other one is a Windows XP machine. Ping is good between routers and machines but no ability to ping domain.com record on DNS server 2003. I set a static nat on the router to route all traffic from gateway to the DNS server internal ip address, still no answer for the dns request. Any ideas or thoughts will be most welcome.

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• Bridge virtual machines out WLAN interface

  - by Thomas

  It seems that my wlan card (intel 5100 AGN) firmware doesn't allow "spoofing" MAC addresses. This has the side effect of destroying the capability to bridge out my virtual machines on that interface. Apparently this is a common thing on wlan cards. I can see the incoming traffic just fine in my virtual machines, but their DHCP queries don't get bridged out of the WLAN card. It works perfectly well when using the wired ethernet port. Is there a workaround for this? MAC-NAT or something? I don't want to route my virtual machines out to the Internet because I don't want my host OS to even have an IP address. I'm using Linux and KVM for virtualization.

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• How to tell Windows 7 to ignore a default gateway

  - by zildjohn01

  I currently have 2 network cards in my PC -- one connected to an internal network on a router with a disconnected WAN port (10.x.x.x), and one connected to the internet through a consumer router (192.168.0.x). Windows seems to recognize them correctly (my "Network and Sharing Center" lists them as "No Internet" and "Internet" respectively), however when I try browsing the internet it always tries the internal network's default gateway, rather than the one with internet access. Trying to ping a website results in "Reply from 10.0.0.1: Destination net unreachable.". A simple "route delete 0.0.0.0 mask 0.0.0.0 10.0.0.1" fixes the problems, but they return upon reboot, or upon renewing my IP. Is there any way to tell Windows to ignore one NIC's default gateway, or to at least give them priorities?

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• How to send local mail via postfix to another server

  - by scotts

  I have postfix set up for use as an STMP server to send mail for my domain, but I receive email for the domain via gmail/google apps. The reason I use my own postfix is because I send out a lot of transactional emails to my customers using a web app, and the volume would exceed what google allows with its SMTP servers. Everything works fine, except cron & system mail gets routed to local users on the server, not to the appropriate accounts at google mail. How can I route this system mail to the respective google mail accounts instead?

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• SLA Violations - Compensation expectations and vague contracts

  - by llllxllll

  Tagging this as cautionary tale. I took over for an admin a year and a half ago, and reviewed the 3 year contract with our ISP. There were no specific SLA promises in the contract that I found, and have been meaning to review the contract with our rep. Of course, we had an outage this past week that resulted in almost four days of downtime !!!!! This involves eff-ups of epic proportions on our ISP's part and a telco they colocate with. Details can be provided. I am the network / systems / purchasing / and helpdesk at my company...and am willing to fight with the ISP. I also have more management that can get involved, including the name on the contract. First, if there are not concrete guarantees about compensation and downtime, we are screwed right? Two, if we want out of our contract, does anyone have experience going the legal route, and if so, who knows a lawyer? =)

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