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• XenServer: Editing clone configuration before boot

  - by Jeff Ferland

  Upon cloning a base image, I need to reconfigure basic settings. Regenerating the ssh host key, changing static IP assignments, setting the host name, etc. Because of the network setup, DHCP is not an option. That more or less rules out SSHing in with a predefined key or running a startup script since I can't provide the IP externally. I'd most like to mount the filesystem of the new machine on Dom0, but the lvm volumes are exported and it appears to be Bad Form to import them so the Dom0 machine can see them. What's your best suggestion for altering files in a cloned VM before boot? Must be non-interactive, and I'm going to guess out the gate that scripting access via xe console is not going to work well.

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• Web Server Scripting Hack to Maintain State and Keep a Domain Cookieless

  - by jasonspalace

  Hello, I am looking for a solution on a LAMP server to keep a site cookieless such as "example.com", where static content is served from "static.example.com", and with rules in place to rewrite requests for "www.example.com" to "example.com". I am really hoping to avoid setting up a cookieless domain for the static content due to an unanswered SEO concern with regards to CNAMEing to a CDN. Is there a way, (or safe hack), that can be implemented where a second domain such as "www.example2.com" is CNAMEd, aliased, or otherwise used with "example.com" to somehow trick a php application into maintaining state with a cookie dropped on "www.example2.com" therefore keeping all of "example.com" cookieless? If such a solution is feasible, what implications would exists with regards to SSL and cross-browser compatibility other than requiring users to accept cookies from 3rd party domains and possibly needing an additional SSL to keep the cookie secure? Thanks in advance to all.

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• Apache disable DNS lookups

  - by odeceixe

  I'm using Debian 4.3.2-1 and Apache 2 on my production server. Watching the logs, I noticed Apache is resolving client's hostnames even with HostnameLookups Off in apache2.conf. I want to avoid these lookups so I'm guessing Apache is making this DNS query because I have mod_authz_host enabled. When I try to unlink this module, I get several modules complaining because they use the Order directive. How is the clean way to go? Should I comment all Order directives like Order allow,deny Deny from all Is this the only way to stop Apache from making DNS requests? I would like to deny access to .htaccess files and some rules like that.

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• Block P2P traffic on a Linksys router WRT54G with tomato firmware

  - by Kami

  Hi, I'm running a small wireless network (6 to 10 users) on a Lynksys WRT54G with tomato firmware sharing an internet connection. I don't want the users to download files with bittorrent (mainly used) and other p2p apps. I've also found some solutions about lowering p2p traffic priority using QoS. I really need to BAN p2p traffic. Does anyone know how to setup some rules to deny that kind of traffic ? I've tried to setup an Access Restriction Rule: But it's not working at all ...

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• allow SSH to bypass VPN on OSX mavericks, openvpn, pf

  - by zycho42

  My home computer connects to the internet through an OpenVPN connection. However, I would like to be able to connect to my home computer from outside over ssh. Ssh is set up and working, but when I connect to the vpn ssh is only accessible from inside my home network. I figure what's going wrong is my router forwards incoming ssh connections to my mac, but then my mac replies over the vpn, so the connection from outside times out. I've got pf set up for a couple of other things, but I can't figure out how to let the ssh replies bypass the vpn using pf. I've come across other solutions that use ip tables, routing tables and rules, but I can't figure out how to set that up on mavericks. I've been searching for this for a while now but I haven't found a working solution. Any help would be greatly appreciated!

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• Forward the Wan IP to another Wan IP without change the Source address

  - by user195410

  I have tried this case by using the NAT function in iptables but fail example. PC A IP is 1.1.1.1 (Win7) My Server IP is 2.2.2.2 (CentOS 6.2) target Server B is 3.3.3.3 (Windows server 2003) Flow: PC A WanIP -- My Server A -- Server B (WanIP) ----My iptables rules--------- iptables -t nat -A PREROUTING -d 2.2.2.2 -p tcp --dport 80 -j DNAT --to-destination 3.3.3.3:80 iptables -t nat -A POSTROUTING -d 2.2.2.2 -j MASQUERADE finally, i can access server B website by enter 2.2.2.2:80 but when i checked the access log at Server B i found it's source address had been changed to src:2.2.2.2 dst:3.3.3.3 please help me to do how to get the real address is src:1.1.1.1 dst:3.3.3.3

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• Gradually migrate from one SMTP server to another

  - by Bart van Wissen

  I maintain an application that sends out a ton of e-mail on a daily basis. Soon, we will have to migrate to another SMTP-server for that, which has an ip address that has no reputation with respect to email delivery. So instead of just flipping the switch, I would like to start by sending a small percentage of all mail through the new server, and then gradually increase that percentage until we reach 100%. It wouldn't be very hard to implement something in the application itself, but I would like to know if there is an easier, more reliable out-of-the-box-type solution for this. My first thought was to use round-robin DNS for this, but the servers require different credentials, use different protocols (one uses SASL, the other doesn't) and even different port numbers, so I think that rules out the DNS based solution. Is there any way, for example, to configure Postfix to send 1 out of x e-mails to relay host A and the rest to relay host B? Or perhaps a different MTA?

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• When to increase AWS RDS MySQL Server instance to larger CPU/RAM?

  - by rksprst

  I'm wondering at what stage do I need to increase the image for the RDS MySQL server to a larger CPU/RAM instance. The CPU utilization graph is near 0. The Avg Free Memory is around 150MB. The Avg Swap Usage is 420MB. Read Latency is 0-20ms/op it spikes up randomly. Avg write latency is on average 5ms/op but spikes up to 10-20ms/op. Are there some common rules here that I should follow? Thanks!

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• Why is port 444 open on this router?

  - by TJ Thind

  I have a Cisco RV110W. I ran nmap at it from the outside and nmap reports that the router has tcp port 444 open. Yet there are no port forwarding rules specifying this port. It should as far as I can tell, be closed. There's even a service listening to that port which I can connect to through telnet. I threw some SNPP commands at it but the service doesn't respond to any of them so I don't believe it's SNPP. Does anyone have any idea why this particular router has tcp port 444 open? I haven't been able to find anything in the manual or on Cisco's website.

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• Can I use MX records to deliver some addresses to Google Apps and some to my server?

  - by Josh

  I have whm installed on my VPS, which my domain MX records are pointing to: 0:mail.mydomain.com and whm/cpanel has mail forwarding rules which pipes certain @mydomain email addresses into my CRM software. But for certain email addresses I want to forward into Google Apps. For example, [email protected], [email protected] pipes into cPanel -- CRM (mail.mydomain.com) but [email protected] should be going to Google MX records. Is that possible? The reason why is I want to register for Google Apps such as analytics and other Google services under [email protected]. My initial thoughts were to add a subdomain such as [email protected] and point that subdomain's MX records to Google.. but I want to avoid this if possible.

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• openldap search acl

  - by Patrick

  I'm trying to write an access control for OpenLDAP to allow a user to search with a certain base dn, but only get results back from certain sub dn's. I've played with lots of different rules but cant get it to work. I'm not sure its even possible. For example: I have the user with the dn uid=testuser,ou=people,dc=example,dc=com. I want this user to be able to search with a base of dc=example,dc=com and get back entries in ou=people,dc=example,dc=com. There are lots of other sub OUs under dc=example,dc=com, but only entries in ou=people should be returned (for bonus, I'd only like certain attributes to be returned as well). Can this be done?

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• Unable to log into Ubuntu

  - by Rodnower

  I have Ubuntu 12.04.1. Last time I did nothing especial, but suddenly some problem appear: I have a login screen (using lightdm), when I attempt a login, I get a console session and returned to the login screen. I see that it is a known issue, so I tried everything from following steps: To removed .XAuthority Configure to use gdm Reinstall lightdm To include my user to nopasswdlogin group But nothing help... So, these are errors from /var/log/auth.log: Oct 3 01:11:48 alphabet-2 lightdm: pam_unix(lightdm:session): session opened for user lightdm by (uid=0) Oct 3 01:11:48 alphabet-2 lightdm: pam_ck_connector(lightdm:session): nox11 mode, ignoring PAM_TTY :0 Oct 3 01:11:48 alphabet-2 lightdm: pam_succeed_if(lightdm:auth): requirement "user ingroup nopasswdlogin" not met by user "andrey" Oct 3 01:11:48 alphabet-2 dbus[704]: [system] Rejected send message, 2 matched rules; type="method_call", sender=":1.35" (uid=104 pid=1709 comm="/usr/lib/indicator-datetime/indicator-datetime-ser") interface="org.freedesktop.DBus.Properties" member="GetAll" error name="(unset)" requested_reply="0" destination=":1.14" (uid=0 pid=1169 comm="/usr/sbin/console-kit-daemon --no-daemon ") Any ideas?

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• Managing Active Directory Group Membership with a Non-Administrator Account In Server 2008

  - by Laranostz

  I am running Server 2008 R2 in an Active Directory Domain Environment. I have created a group in Active Directory and I have delegated management authority to that group to a user. I want this user to be able to add and remove accounts as needed from that group so that they are exercising some measurement of control without giving them other authority. When I have the user attempt to access the Active Directory Users & Computers Console it prompts them for Administrator credentials. They are using Remote Desktop to access the server, because they do not have Windows 7, and firewall rules prevent using the Remote Management Kit. I do not want to provide them with any level of Administrative rights except the minimum required for them to add/remove users from this group. There are two servers that 'talk' to each other in this isolated environment, a domain controller and a member server, both are only reachable through RDP. Any suggestions?

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• Cron stopped working, partially working.

  - by Robi

  Our cron script stopped working in different dates in August. What can be the possible reasons? We did not change anything. Our hosting showed us a log where we can see that cron is executing our scripts. But, nothing is happening in our scripts. If we manually execute the scripts, we're getting correct results like before. I showed the commands to hosting and they showed me that the commands are working. What should I tell my hosting? what should I do? They are php scripts which are executed by CRON and they just post to facebook and twitter. They don't execute any hard or huge things. I even asked my hosting if we broke any rules.

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• Linux box acting as wireless access point to share the internet connection

  - by Suresh

  A linux machine is connected to internet over two interfaces ppp0 and ppp1 using two modems. Also this machine acts as wireless access point through an interface say, eth0 with ip address 192.168.1.1 and acts as gateway for the connected devices through this network with subnet mask 255.255.255.0 Now is it possible to achieve the following: When any of the connected devices through wireless AP needs internet connection linux machine has to use ppp1 interface for internet. If any of the applications on the linux machine needs internet connection linux machine should use ppp0 interface for the internet. Can this be achieved by adding rules to chains in filter/nat tables? If the kernel routing table has a default rule to route the default traffic through interface ppp0, wil kernel completely ignore ppp1 for internet? PS: new to networking and routing concepts, If the question is not clear leave a comment, will try to give more information.

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• Fedora 9 not reconizing hard drive

  - by Andrew Jones

  I am installing Fedora 9 to a PC (specifications at the bottom) and have had a lot of trouble with it recognising the hard drive. To get the Fedora installer to recognize it in the first place I had to pass "ata_generic.all_generic_ide=1 pci=nomsi" to the kernel, after which it installed OK. However, now when I boot the installed OS, I get a "could not find filesystem '/dev/root'" error. I tried passing the same arguments to the kernel at boot as I did when installing but to no avail. I have tried using the default LVM layout and defining manual ones but it made no difference. There is no option in the BIOS to enable AHCI or anything like that, in fact the BIOS is very limited in most respects. I can get into the system by using the installation CD in rescue mode (with those extra kernal parameters) but I'm not sure what to do once in there... Unfortunately using a more recent version of Fedora or even another Linux distribution altogether isn't an option becuase of outside constraints - which is annoying since I know for a fact Ubuntu works fine on this setup. I have not been using Linux that long, so treat me like an idiot - I am one. Any help would be greatly appreciated, thanks! System spec: Intel Atom Z530 CPU @ 1.6 GHz Intel US15W chipset 1 GB DDR2 160 GB SATA harddisk (Samsung HM16HI) 1000 Mbit/s Ethernet port Phoenix BIOS

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• Proxification rulte for System process

  - by kseen

  I'm trying to configure Microsoft Visual Studio 2010 remote debugging and ran into issue: while connecting to remote computer running MSVSMON, client computer sends SYN request for connection. It makes it under the System process (as I see it in TCPView). As every network apps should be configured to use proxy in our network, I'm trying to add devenv.exe to proxification rules to make its traffic goes thru LAN's proxy server. It doesn't help. So my question is how can I make that low-level-system traffic will go through local area network proxy server?

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• Cant logon to domain over site-to-site vpn

  - by 3molo

  Tied together branch office with main office over two Cisco ASAs. The (internal) networks on either side can communicate with the other. I can ping, use the DC's DNS service and even join a domain on a new client. I can't however logon, I get the "domain controller is not available" error message on client. I find nothing peculiar in DC's event logs. Sicne it's site-to-site (with ping), it's always up so it should work. No firewall rules (except allow any any) between the two networks (of either side). Main site internal net: 10.10.10.0/24 Branch office net: 10.180.3.0/24 Am I overlooking something here? Where should I start investigating this?d

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• How to test if SYN and FIN are both dropped at the same time in hping3?

  - by snow

  One of the rules to prevent unexpected attack is to prevent SYN & FIN being used together. SYN and FIN are both set $IPT -A INPUT -p tcp --tcp-flags SYN,FIN SYN,FIN -j DROP How do I use hping to test if this iptable rule works? hping3 192.168.7.0 --keep -S -F??? Is this complete? When just type iptables -L, it shows: Chain INPUT (policy DROP) target prot opt source destination ACCEPT all -- anywhere anywhere DROP tcp -- anywhere anywhere tcp flags:FIN,SYN/FIN,SYN WHY do I need to put the "SYN,FIN" twice before drop? Is it because one for source and one for destination?

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• Gre tunnel Linux Cisco

  - by mezgani

  I've created a GRE tunnel between LAN A and LAN B. LAN A is behind a router, and LAN B is behind a Linux box and this box has a pppoe interface. When i do tcpdump on Linux box i see that the traffic is routerd to Linux box (tunnel end), so my need is routing the tunnel traffic to internet. I've added these rules to my iptables script, and i stay unable to connect to internet from LAN A Permitting Linux to act as router (necessary to forward packets) echo "1" /proc/sys/net/ipv4/ip_forward iptables -A INPUT -p 47 -j ACCEPT iptables -A FORWARD -i ppp0 -j ACCEPT iptables -A FORWARD -m state --state ESTABLISHED,RELATED -j ACCEPT iptables -t nat -A POSTROUTING -o gre0 -j MASEQUARADE What i've forgot to set in this case?

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• Why is my firewall preventing me from accessing some websites

  - by nosx

  I have an old Belkin router and when I enable the firewall I cannot access certain websites. For example: http://www.avisynth.org With Firewall Enabled: Main page loads and begins to do a meta refresh which never finishes. With Firewall Disabled: Main page loads and the meta refresh completes as normal and I am taken to the wiki page. I have not setup any rules in my firewall that would prevent this site from loading, yet it refuses to load unless I have the firewall disabled completely. My router has a hidden page with advanced settings on it for the firewall which I was able to acccess and take a screenshot of, but I did not want to mess with these values unless I absolutely have to do so: What might be causing this problem and how would I go about fixing it?

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• freebsd ipfw tablearg.

  - by Shamanu4

  Hello. I'm configuring freebsd firewall and have such situation: 51000 pipe tablearg ip from not table(17) to table(20) out xmit ng* 51010 pipe tablearg ip from table(21) to not table(17) in recv ng* 51020 pipe tablearg ip from any to table(18) out xmit ng* 51030 pipe tablearg ip from table(19) to any in recv ng* tables 18,19,20,21 have client ip addresses and pipe numbers table 17 list of networks. rules 51020 and 51030 work fine but what is going at 51000 and 51010 ? How to determine firewall to take pipe number from tables 20 and 21 - not from 17 ?

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• What advantages does mod_evasive have over mod_security2 in terms of DDOS protection?

  - by Martynas Sušinskas

  Good day, I'm running an Apache2 server in front of a Tomcat and I need to implement a DDOS protection mechanism on the Apache2 layer. I have two candidates: mod_evasive and mod_security2 with the OWASP core rule set. Mod_security is already installed for overall protection, but the question is: is it worth adding mod_evasive besides mod_security just for the DDOS (does it have any major advantages) or the OWASP crs rules in the /experimental_rules/ directory (modsecurity_crs_11_dos_protection.conf) provide the same protection? Or it's just a matter of preference? The sites are not very high traffic normally. Thank you for your answers, Martynas

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• Is it possible to disable the retry mechanism in Exim

  - by Tony Meyer

  I have a very simple Exim configuration that's just forwarding all mail to a set of destination addresses. When immediate delivery to an address fails, the message is added to the queue (and then processed by the retry rules). I want to change this so that if immediately delivery fails, the message is :blackhole:d. (It's ok if a bounce is generated instead, as I'll just redirect the bounce to the :blackhole:). This needs to occur for temporary failures (i.e. 4xx) as well as permanent (i.e. 5xx) ones. I understand that this means that if delivery can't be done immediately the message will be permanently and irretrievably lost. In this particular context, that isn't a problem. Reading over this, it sounds suspiciously like "how can I improve my spamming Exim server". That really isn't what this is for, and if you can figure out a way I can prove that, I'm happy to do so!

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• Routing only some local IPs through VPN on dd-wrt

  - by bo-inge-ostberg

  Much similar to this entry: http://serverfault.com/questions/94283/using-dd-wrt-to-connect-to-vpn-and-forward-all-traffic-of-certain-devices-through , I have set up my router with dd-wrt + OpenVPN to connect to a VPN. This works fine, and all traffic from behind the router goes through the VPN. How do I route(?) traffic in the router so that only certain IPs from the LAN will go through the VPN, while the others take the "normal" route? Is it also possible to allow traffic from certain local IPs to go ONLY through the VPN, making it impossible for them to use the regular internet connection if the VPN is down? I know this question was answered in the post I linked to, but that just doesn't seem to work for me. The routing table and rules change, but traffic still just goes through the VPN.

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