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• Email flow problem in Exchange 2003

  - by Hugo Garcia

  Hello colleagues, I have a problem whit some emails that are not being delivered to the user inbox. The SMTP server on the DMZ that receives email from the internet is a Symantec Brigthmail Gateway, this server reports that the message was delivered normally to the exchange server: The DMZ server forwars the incoming mail to the exchange server that is on the LAN segment, and the message tracking on the exchange server reports the email being submited to the advanced queue: I have done severals searches on google, without any luck. have any one of you guys experienced similar problems? Any help or pointers would be very appreciated. as requested, here is a transcript of a smtp session: helo 250 mail2.XXXXXXXXXXXXXXXX.XXX.XX Hello [192.168.9.6] MAIL FROM: [email protected] RCPT TO: [email protected] DATA Subject: Mensaje de Prueba Test . 250 2.1.0 [email protected] OK 250 2.1.5 [email protected] 354 Start mail input; end with <CRLF>.<CRLF> 250 2.6.0 <'[email protected]> Queued mail for delivery

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• Setting Up My Home Network

  - by Skizz

  I currently have five PCs at home, three running WinXP and two running Ubuntu. They are set up like this: ISP ----- Modem ---- Switch ---- Ubuntu1 -- B&W Printer | |--WinXP1 | |--WinXP2 Wireless |--Colour Printer | |---------Ubuntu2 |---------WinXP3 (laptop) The Ubuntu1 machine is set up as a PDC using Samba and runs fetchmail, procmail, dovecot to get my e-mail and allow me to access the e-mail via imap so I can read the e-mail on any PC. I'd like to set up the network like this: ISP ----- Modem ---- Ubuntu1 ---- Switch ------WinXP1 | | |--WinXP2 B&W Printer Wireless |--Colour Printer | |---------Ubuntu2 |---------WinXP3 (laptop) My questions are: How to configure Ubuntu1 to act as a firewall. How to configure Ubuntu1 to provide a consistant user authentication across the network, at the moment Samba provides roaming profiles for the XP machines but the Ubuntu2 machine has it's own user lists. I'd like to have a single authentication for both XP machines and linux machines so that users added to the server list will propagate to all PCs (i.e. new users can log on using any PC without modifying any of the client PCs). How to configure a linux client (Ubuntu2 above) to access files on the server (Ubuntu1), some of which are in user specific folders, effectively sharing /home/{user} per user (read and write access) and stuff like /home/media/photos with read access for everyone and limited write access. How to configure the XP machines (if it is different from a the Samba method). How to set up e-mail filtering. I'd like to have a whitelist/blacklist system for incoming e-mails for some of the e-mail accounts (mainly, my kids' accounts) with filtered e-mails being put into quaranteen until a sysadmin either adds the sender to a blacklist or whitelist. OK, that's a lot of stuff. For now, I don't want config files*, rather, what services / applications to use and how they interact. For example, LDAP could be used for authentication but what else would be useful to make the administration of the LDAP easier. Once I have a general idea for the overall configuration, I can ask other questions about the specifics. Skizz I have looked around for information, but most answers are usually in the form of abstract config files and lists of packages to install.

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• Cisco IOS BVI ACL: Only allow established UDP

  - by George Bailey

  Related: Cisco IOS ACL: Don't permit incoming connections just because they are from port 80 I know we can use the established keyword for TCP.. but what can we do for UDP (short of replacing a Bridge or BVI with a NAT)? Answer I found out what "UDP has no connection" means. DNS uses UDP for example.. named (DNS server) is lisenting on port 53 nslookup (DNS client) starts listening on some random port and sends a packet to port 53 of the server and notes the source port in that packet. nslookup will retry 3 times if necessary. Also the packets are so small that it does not have to worry about them coming in the wrong order. If nslookup receives a response on that port that comes from the servers IP and port then it stops listening. If the server tried to send two responses (for example a response and a response to the retry) then the server would not care if either of them made it because the client has the job to retry. In fact.. unless ICMP 3/3 packet gets through the server would not know about a failure. This is different from TCP where you get connection closed or timed out errors. DNS allows for an easy retry from the client as well as small packets.. so UDP is an excellent choice because it is more efficient. In UDP you would see nslookup sends request named sends answer In TCP you would see nslookup's machine sends SYN named's machine sends SYN-ACK nslookup's machine sends ACK and the request named's machine sends the response That is much more than is necessary for a tiny DNS packet

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• cannot reach munin port on other AWS instance

  - by Amedee Van Gasse

  2 AWS instances, in the same region but different availability zones, one is in regular EC2 and the other is in VPC, both have an Elastic IP, both are 64bit Amazon Linux AMI 2014.03.1. Both are running munin-node. The instance in the VPC is running munin-cron. I have added incoming TCP and UDP port 4949 to the security groups of both instances. On the munin node, I added an allow-line with the IP address (regular expression) of the munin server to /etc/munin/munin-node.conf. I bind munin-node to any interface using host *. Then I did sudo service munin-node restart. Then I ran netstat. $ sudo netstat -at | grep munin tcp 0 0 *:munin *:* LISTEN So the port is open there. On the munin server AND on the munin node: $ nmap AMAZON-IP -p 80,4949 | grep tcp 80/tcp open http 4949/tcp closed munin On the munin node: $ nmap localhost -p 80,4949 | grep tcp 80/tcp open http 4949/tcp open munin So from the outside, the http port is open (Apache is running) but the munin port is closed. The node can't even reach the munin port on it's own public IP address, but it can on localhost. I added port 80 as a sanity check, to be sure that there is network connectivity at all. So what am I overlooking here?

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• Why does my exchange message filtering rule not work?

  - by Jon Cage

  I have two rules set up to sort incoming bug reports. The first is specific to a single device: Apply this rule after the message arrives sent to SMS Distribution and with <source_device_number>: in the body move it to the BugReports\<source_device_number> folder ..and the second is a catch-all for everything else: Apply this rule after the message arrives sent to SMS Distribution move it to the BugReports folder For some reason though, the first rule never seems to act even though it's higher in the list. So for some reason an email like the following doesn't seem to get caught by the first rule: From: <SourceDeviceUID> To: SMS Distributor Subject: Message from <SourceDeviceUID> Message: <source_device_number>: Device encountered a problem. Details below... ...where <source_device_number> is an integer. The second rule works fine. But for some high-priority devices, I want them automatically sorted. Why might that first rule fail?

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• Problems forwarding zone to another DNS server.

  - by sebastian nielsen

  I have a authorative DNS server at 83.248.21.18 which are authorative for the domain "finahemgoteborg.se". Now my registrar is requiring me to have 2 DNS servers for the domain, so I would now want the machine 85.228.103.141 just forward all incoming queries for "finahemgoteborg.se" to the 83.248.21.18 server. In the 85.228.103.141 BIND server, I have the following config: zone "finahemgoteborg.se" in { type forward; forwarders {83.248.21.18;}; }; But the problem is that 85.228.103.141 is still responding with "REFUSED" when querying it for example www.finahemgoteborg.se A record. How can I fix it. I do NOT want to set up a master/slave situation, just one nameserver that forwards to a another. Edit The Rest of named.conf: options { directory "/var/cache/bind"; version "none"; allow-recursion {"none";}; minimal-responses no; }; zone "sebn.us.to" in{ type master; file "/etc/bind/sebn.us.to"; }; zone "ns1sebn.us.to" in{ type master; file "/etc/bind/sebn.us.to"; }; zone "ns2sebn.us.to" in{ type master; file "/etc/bind/sebn.us.to"; }; zone "finahemgoteborg.se" in{ type forward; forwarders {83.248.21.18;}; };

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• Anonymous FTP upload on CentOS 5.2

  - by Craig

  I need to allow users to upload files to an FTP server anonymously. They should not be able to see any other files, or download files. It is a CentOS 5.2 server. I have a separate partition for the the upload area (mounted at /ftp). I have tried to set up vsftpd, followed all the instructions/advice I could find. But, when a user logs in and tries to transfer a file it throws a "553 could not create file." error. If I do a 'pwd' it shows the directory as "/" rather than the anon_root of "/ftp/anonymous". Any attempt to change the remote directory ends with "550 Failed to change directory.". I have a subdirectory "/ftp/anonymous/incoming" that is writable for the uploads SELinux is in permissive mode. I am running version 2.0.5 release 16.el5 of vsftpd. Here is the vsftpd.conf file: anonymous_enable=YES local_enable=YES write_enable=YES local_umask=002 anon_umask=007 file_open_mode=0666 anon_upload_enable=YES anon_mkdir_write_enable=NO dirmessage_enable=YES xferlog_enable=YES connect_from_port_20=YES chown_uploads=YES chown_username=inftpadm xferlog_std_format=YES nopriv_user=nobody listen=YES pam_service_name=vsftpd userlist_enable=YES tcp_wrappers=YES ftp_username=inftpadm anon_root=/ftp/anonymous anon_other_write_enable=NO anon_mkdir_write_enable=NO anon_world_readable_only=NO dirlist_enable=YES Can anyone help?

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• Building an Email server for mass emails

  - by EGHDK

  I recently started doing IT odd jobs for a company. The company has a pretty decent sized mail list that costs them over $3000 per month to send out email from. The company is set on creating their own email server so that it can just run and send emails to the client lists. They only send out emails roughly once a month. Has anyone had experience with this? This wouldn't be an email server I guess (as it doesn't need to handle incoming messages) It just has to be able to send around 200,000 emails, once a month. What would be the best way to go about this? Services online like MailChimp have proved to be too pricey. It's not an ad that is being sent out, it's more of a monthly newsletter, so we don't need any crazy software for ROI or anything crazy like that. If I could fit 200,000 people in GMAIL, I'd do it, but I don't think I can (heh... maybe I should try).

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• Destination NAT Onto the Same Network from internal clients

  - by mivi

  I have a DSL router which acts as NAT (SNAT & DNAT). I have setup a server on internal network (10.0.0.2 at port 43201). DSL router was configured to "port forward" (or DNAT) all incoming connections to 10.0.0.2:43201. I created a virtual server for port forwarding on DSL router. I also added following iptables rules for port forwarding. iptables -t nat -A PREROUTING -p tcp -i ppp_0_1_32_1 --dport 43201 -j DNAT --to-destination 10.0.0.2:43201 iptables -I FORWARD 1 -p tcp -m state --state NEW,ESTABLISHED,RELATED -d 10.0.0.2 --dport 43201 -j ACCEPT # ppp_0_1_32_1 is routers external interface. # routers internal IP address is 10.0.0.1 and server is setup at 10.0.0.2:43201 Problem is that connections coming from external IP addresses are able to access internal server using External IP address, but internal clients (under NAT) are not able to access server using external IP address. Example: http://<external_address>:43201 is working from external clients But, internal clients are not able to access using http://<external_address>:43201 This seems to be similar to the problem described in http://www.netfilter.org/documentation/HOWTO/NAT-HOWTO-10.html (NAT HOW-TO Destination NAT Onto the Same Network). Firstly, I am not able to understand why is this a problem for internal clients? Secondly, what iptables rule will enable internal clients to access server using external IP address? Please suggest.

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• Building an Email server for mass emails

  - by EGHDK

  I recently started doing IT odd jobs for a company. The company has a pretty decent sized mail list that costs them over $3000 per month to send out email from. The company is set on creating their own email server so that it can just run and send emails to the client lists. They only send out emails roughly once a month. Has anyone had experience with this? This wouldn't be an email server I guess (as it doesn't need to handle incoming messages) It just has to be able to send around 200,000 emails, once a month. What would be the best way to go about this? Services online like MailChimp have proved to be too pricey. It's not an ad that is being sent out, it's more of a monthly newsletter, so we don't need any crazy software for ROI or anything crazy like that. If I could fit 200,000 people in GMAIL, I'd do it, but I don't think I can (heh... maybe I should try).

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• Window 7 Host does not answer to ping

  - by gencha

  Today I tried printing on a shared printer on one of our homegroup members. Sadly it did not work (printer marked as offline). Shortly after, I noticed I can't even ping the machine that owns the printer (I also can not remotely access it in any other way I've tried). Currently I'm trying to ping the machine from the router both computers are connected to (and my machine in question doesn't answer). I do receive the echo requests (as verified with WireShark). I also added a rule in the Windows Firewall to specifically allow ICMP echo requests, but that didn't change anything. I also tried netsh firewall set icmpsetting 8 enable, but that didn't change anything either. Completely disabling the Windows Firewall has no effect on the issue either. One has to wonder, where does Windows log when and why it ignored any incoming packets? How can I get to the bottom of this? Here are some ways I found to dig deeper into the issue: Enabling logging on the Windows Firewall Enabling Windows Filtering Platform Auditing Both methods at least give more insight into the issue. The plain log file is full of entries like this: 2011-11-11 14:35:27 DROP ICMP 192.168.133.1 192.168.133.128 - - 84 - - - - 8 0 - RECEIVE So the ICMP packets are being dropped as if that was intended. The Event Viewer now gives a little bit more details: The Windows Filtering Platform has blocked a packet. Application Information: Process ID: 4 Application Name: System Network Information: Direction: Inbound Source Address: 192.168.133.1 Source Port: 0 Destination Address: 192.168.133.128 Destination Port: 8 Protocol: 1 Filter Information: Filter Run-Time ID: 214517 Layer Name: Receive/Accept Layer Run-Time ID: 44 This same entry is always repeated with 2 points of information changing: Process ID: 420 Application Name: \device\harddiskvolume2\windows\system32\svchost.exe The service host with the PID 420 is the host for the following services: Windows Audio DHCP Client Windows Event Log HomeGroup Provider TCP/IP NetBIOS Helper Security Center Additionally, there is currently this problem with the same machine: Even though my network is set to be a "Home network", I am unable to create a new homegroup.

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• limiting connections from tomcat to IIS - proxy? iptables?

  - by Chris Phillips

  Howdy, I've webapp on tomcat6 which is connecting to an M$ PlayReady DRM instance on IIS6.0 The performance is seen to be best when we bench mark (using ab) the DRM service with 25 concurrent connections, which gives about 250 requests per second, which is ace. higher concurrent connections results in TCP/IP timeouts and other lower level mess. But there is no way to control how the tomcat app connects to the service - it's not internally managing a pool of connections etc, they are all isolated http connections to the server. Ideally I'd like a situation where we can have 25 http 1.1 connections being kept alive permanently from tomcat and requesting the licenses through this static pool of connections, which I think would the best performance. But this is not in the code, so was looking for a way to possibly simulate this at the Linux level. I was possibly thinking that iptables connlimit might be able to gracefully handle these connections, but whilst it could limit, it'd probably still annoy the app. What about a proxy? nginx (or possibly squid) seems potentially appealing to run on the tomcat server and hit on localhost as we might want to add additional DRM servers to use under load balance anyway. Could this take 100 incoming connections from tomcat, accept them all and proxy over the the IIS server in a more respectful manner? Any other angles? EDIT - looking over mod_proxy for apache, which we are already using for conventional use on an apache instance in front of this tomcat instance, might be ideal. I can set a max value on the proxy_pass to only allow 25 connections, and keep them alive permanently. Is that my answer? Many thanks, Chris

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• how to block spam email using Microsoft Outlook 2011 (Mac)?

  - by tim8691

  I'm using Microsoft Outlook 2011 for Mac and I'm getting so much spam I'm not sure how to control it. In the past, I always applied "Block Sender" and "Mark as Junk" to any spam email messages I received. This doesn't seem to be enough nowadays. Then I've started using Tools Rules to create rules based on subject, but the same spammer keeps changing subject lines, so this isn't working. I've been tracking the IP addresses they also seem to be changing with each email. Is there any key information I can use in the email to apply a rule to successfully place these spam emails in the junk folder? I'm using a "Low" level of junk email protection. The next higher level, "high", says it may eliminate valid emails, so I prefer not to use this option. There's maybe one or two spammers sending me emails, but the volume is very high now. I'm getting a variation of the following facebook email spam: Hi, Here's some activity you have missed. No matter how far away you are from friends and family, we can help you stay connected. Other people have asked to be your friend. Accept this invitation to see your previous friend requests Some variations on the subject line they've used include: Account Info Change Account Sender Mail Pending ticket notification Pending ticket status Support Center Support med center Pending Notification Reminder: Pending Notification How do people address this? Can it be done within Outlook or is it better to get a third party commercial software to plug-in or otherwise manage it? If so, why would the third party be better than Outlook's internal tools (e.g. what does it look for in the incoming email that Outlook doesn't look at)?

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• IP queue buffer

  - by summerbulb

  I seem to have an issue with IP queue. I have a linux machine that I am using to run some experiments. The linux machine is configured to be a router, having two NICs, connecting two other computers, and managing their network traffic. All incoming packages are captured, using iptables, and analyzed by a C application. The application analyzing the packets has a built-in delay, as part of the experiment. So I have one very fast computer sending packets through my linux-router and a (relatively) slow linux-router that analyses and deals with the packets, one by one. This situation leads to the fact that when I fire up a sender application on one of the computers connected to the linux-router, my IP queue on the linux-router gets filled up (almost) instantaneously. The IP queue's max length is currently set to 1024, and if it overflows, the packets are dropped. This is expected and i'm OK with it. But, (and this is where it gets interesting), every now and then I get the following error: "Failed to receive netlink message: No buffer space available" At start, I thought this was due to the IP queue overflow, but after some analysis i found that sometimes I get the error even if the IP queue buffer did not overflow, and sometime I DON'T get the message even though the buffer DID overflow. When I run > cat /proc/net/ip_queue, I get the following table (also used to monitor the IP queue overflow): Peer PID : 27389 Copy mode : 2 Copy range : 65535 Queue length : 0 Queue max. length : 1024 Queue dropped : 1166875 Netlink dropped : 2916 Looking at the last two values, Queue dropped seems to refer to packets that did not manage to get into the IP queue because the buffer was full. I can see this value rise as I bombard the linux-router. Netlink dropped ( as it's name implies :) ) seems to have to do with the error i'm getting. I did my best to search for material on this error, but wasn't able to find anything that seemed to point me in the required direction. Bottom line: Why am I getting this error and what can I do to avoid it?

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• Running HTTP and HTTPS connections for a single domain (say, www.example.com) through a Cisco ACE SS

  - by Paddu

  My web application config has a Cisco ACE load balancing across a server farm and I want to use the ACE as an SSL endpoint as well. To make this work, the network architect has come up with a design where all secure pages have to be served from secure.my-domain.com, while non-secure pages are served up from www.my-domain.com. The reason for this is apparently that the configuring the Cisco ACE to accept HTTPS requests on port 443 for a particular public IP prevents the simultaneous acceptance of HTTP requests on port 80 for the same IP. While I'm not a networking (or Cisco) expert, this seems to be intuitively wrong, as it would prevent any website using the Cisco ACE to serve pages on http://www.my-domain.com and https://www.my-domain.com simultaneously. In this situation, my questions are: Is this truly a limitation of the Cisco ACE when used as an SSL endpoint? If not, then can I assume that we can set up the ACE to accept connections for a particular IP on ports 80 and 443, and function as an SSL endpoint for the incoming requests on 443? Links to appropriate documentation most welcome here. Assuming the setup in the previous question, can I then redirect both sets of requests to the same server farm on the same port?

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• fwbuilder/iptables manually scripted + autogenerated rules at startup?

  - by Jakobud

  Fedora 11 Our previous IT-guy setup iptable rules on our firewall in a way that is confusing me and he didn't document any of it. I was hoping someone could help me make some sense of it. The iptables service is obviously starting at startup, but the /etc/sysconfig/iptables file was untouched (default values). I found in /etc/rc.local he was doing this: # We have multiple ISP connections on our network. # The following is about 50+ rules to route incoming and outgoing # information. For example, certain internal hosts are specified here # to use ISP A connection while everyone else on the network uses # ISP B connection when access the internet. ip rule add from 99.99.99.99 table Whatever_0 ip rule add from 99.99.99.98 table Whatever_0 ip rule add from 99.99.99.97 table Whatever_0 ip rule add from 99.99.99.96 table Whatever_0 ip rule add from 99.99.99.95 table Whatever_0 ip rule add from 192.168.1.103 table ISB_A ip rule add from 192.168.1.105 table ISB_A ip route add 192.168.0.0/24 dev eth0 table ISB_B # etc... and then near the end of the file, AFTER all the ip rules he just declared, he has this: /root/fw/firewall-rules.fw He's executing the firewall rules file that was auto-generated by fwbuilder. Some questions Why is he declaring all these ip rules in rc.local instead of declaring them in fwbuilder like all the other rules? Any advantage or necessity to this? Or is this just a poorly organized way to implement firewall rules? Why is he declaring ip rules BEFORE executing the fwbuilder script? I would assume that one of the first things the fwbuilder script does it get rid of any existing rules before declaring all the new ones. Am I wrong about this? If that was the case, the fwbuilder script would basically just delete all the ip rules that were defined in rc.local. Does this make any sense? Why is he executing all this stuff at startup in rc.local instead of just using iptables-save to keep the firewall settings at /etc/sysconfig/iptables that will get implemented at runtime?

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• How to set up a easy-to-use proxy for the whole system with WinXP client and server?

  - by Pekka

  I am working together intensively with a colleague on the Canary Islands. We speak through live messenger and work together using a RDP software. She has frequent problems with connections to certain big-name and small-name sites (amongst others live.com, google.com, gmx.de) very likely to be caused by the spanish provider (the connections simply time out, this has been going on for weeks already). I have been thinking about setting up my computer as a proxy to make these connections work. I have a DSL connection and am behind a NAT capable router that I control. Does anybody know a simple, "one-click" way to transport ALL network traffic through a remote proxy? Without having to set proxy settings for each application that uses the internet? VPN is not an option, because I am behind a firewall that supports protocol 47 and such, but I have never succeeded in getting an incoming VPN connection to work. I can however redirect normal traffic using NAT. A VPN solution that does not need strange protocols would also be an option.

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• How do I set up an email server that automatically maintains a list of previous recipients?

  - by hsivonen

  I want to set up an email server with the following characteristics. What software (besides bogofilter and clamav that I'm naming) should I use and what HOWTOs should I read? The server should run some flavor of Linux that's as low-maintenance as possible and self-updates for security patches in a timely fashion. (Debian stable?) When email is sent, all the recipients are stored in the list of previous recipients maintained by the server. Scan incoming messages with clamav and treat as spam if it contains viruses. When email arrives (if it passed clamav), if the sender is on the list of previous recipients, bypass spam filter. If the List-Id header names a mailing list on a manually maintained list of known-clean mailing lists, bypass spam filter and deliver into a mailbox depending on the mailing list name. Email that wasn't from previous recipients, manually white listed domains or mailing lists gets filtered by bogofilter. Spam goes into a spam mailbox. Email considered to be ham should automatically be fed to bogofilter training as ham. Email considered to be spam (incl. messages with viruses) should be automatically fed to bogofilter training as spam. There should be mailboxes for false ham and false spam that an IMAP client can move email into so that the server retrains bogofilter appropriately. Email sending requires SMTP over SSL. Email reading requires IMAPS. Should I also want to use SpamAssassin in addition to bogofilter?

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• Exchange 2010 CAS Removal == Broken???

  - by Doug

  Hi there, I recently upgraded to exchange 2010 and have a setup with 2 of my servers running CAS roles - EXCH01, EXCH02 EXCH02 just happens to also have a mailbox role where a lot of the users sit EXCH01 is my front facing CAS server, and is facing the net with SSL etc and incoming mail moving through it as a hub transport layer server as well. As i was trying to lean things out in my VM environment i removed the CAS role from EXCH02 and all hell broke loose. All the mail users that have a mailbox on EXCH02 had their homeMTA set to a deleted items folder in AD and so did their msExchHomeServer properties. After a complete battle i manually fixed these issues to the oldvalues, and in the mean time reinstalled CAS on EXCH02 (management was going nuts with out OUTLOOK working so i just put things back the way they were in a hurry.) I must add as a strange thing on the side, that before i reset these to point at EXCH02 i tried EXCH01 and it failed. I still want to remove the CAS role from EXCH02 as it should really not have it (error on install/planning on my part) and would have thought that this would not cause the issues it did, i assumed that the fact that there was another CAS server in the admin group all would be good. Was i wrong in my assumption? and what can i do to complete this successfully the second time round? Do i need to rehome all the mailboxes to the CAS server? is this a bug in the role uninstall?

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• VLAN for WiFi traffic separation (new to VLANing)

  - by Philip

  I run a school network with switches in different departments. All is routed through to a central switch to access the servers. I would like to install WiFi access points in the different departments and have this routed through the firewall (an Untangle box that can captive-portal the traffic, to provide authentication) before it gets onto the LAN or to the Internet. I know that the ports that the APs connect to on the relevant switches need to be set to a different VLAN. My question is how do I configure these ports. Which are tagged? Which are untagged? I obviously don't want to interrupt normal network traffic. Am I correct in saying: The majority of the ports should be UNTAGGED VLAN 1? Those that have WiFi APs attached should be UNTAGGED VLAN 2 (only) The uplinks to the central switch should be TAGGED VLAN 1 and TAGGED VLAN 2 The central switch's incoming ports from the outlying switches should also be TAGGED VLAN 1 and TAGGED VLAN 2 There will be two links to the firewall (each on its own NIC), one UNTAGGED VLAN 1 (for normal internet access traffic) and one UNTAGGED VLAN 2 (for captive portal authentication). This does mean that all wireless traffic will be routed over a single NIC which will also up the workload for the firewall. At this stage, I'm not concerned about that load.

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• How to access a port via OpenVpn only

  - by Andy M

  I've set up an openvpn server alongside an apache website that can only be accessed on port 8100 on the same machine. My /etc/openvpn/server.conf file looks like this: port 1194 proto tcp dev tun ca ./easy-rsa2/keys/ca.crt cert ./easy-rsa2/keys/server.crt key ./easy-rsa2/keys/server.key # This file should be kept secret dh ./easy-rsa2/keys/dh1024.pem # Diffie-Hellman parameter server 10.8.0.0 255.255.255.0 ifconfig-pool-persist ipp.txt # make sure clients can still connect to the internet push "redirect-gateway def1 bypass-dhcp" keepalive 10 120 comp-lzo persist-key persist-tun status openvpn-status.log verb 3 Now I tried to let only clients connected to the vpn network access the website on apache via port 8100. So I defined a few iptables rules: #!/bin/sh # My system IP/set ip address of server SERVER_IP="192.168.0.2" # Flushing all rules iptables -F iptables -X # Setting default filter policy iptables -P INPUT DROP iptables -P OUTPUT DROP iptables -P FORWARD DROP # Allow incoming access to port 8100 from OpenVPN 10.8.0.1 iptables -A INPUT -i tun0 -p tcp --dport 80 -m state --state NEW,ESTABLISHED -j ACCEPT iptables -A OUTPUT -o tun0 -p tcp --sport 80 -m state --state ESTABLISHED -j ACCEPT # outgoing http iptables -A OUTPUT -o tun0 -p tcp --dport 80 -m state --state NEW,ESTABLISHED -j ACCEPT iptables -A INPUT -i tun0 -p tcp --sport 80 -m state --state ESTABLISHED -j ACCEPT Now when I connect to the server from my client computer and try to access the website on 192.168.0.2:8100, my browser can't open it. Will I have to forward traffic from tun0 to eth0? Or is there anything else I'm missing?

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• Splunk is fantastically expensive: What are the alternatives?

  - by samsmith

  This has been discussed, but it has been several months, so it may be time to revisit it: Earlier discussion RE Splunk alternatives For the record, Splunk rocks. But the pricing is simply beyond what we can consider (When I spoke with Splunk today, the cost for a system to index 5gb/day of data is over $30,000.) That is more than we spend on SQL Server (by a large multiple), more than we spend on a rack of servers (by a multiple), etc. etc. The splunk sales team is correct (that for $30K we get more value and functionality than if we spend the same building our own system), but it doesn't matter. The splunk cost is simply too high (by a multiple). Soooooo, we are looking around! Is anyone out there building a splunk like system? Our basic need: Able to listen for syslog messages on multiple udp ports Able to index the incoming data in an async way Some kind of search engine Some kind of UI An API to the search engine (to embed in our console) We currently need to index 3-5gb/day, but need to be able to scale to 10gb/day or more. We do not need a lot of history (30 days is fine). We use Windows 2008 and 2003 servers. Thanks for your thoughts!

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• OpenVZ with bridged interfaces and VLAN

  - by Deimosfr

  Hi, I've got a problem with OpenVZ with bridged VLAN. Here is my configuration: +------+ +-------+ +-----------+ +---------+ br0 |VE101 | | | | OpenBSD |----->| Debian |------->| | | WAN |--->| Router | | OpenVZ | +------+ | | | Firewall |----->| br0 br1 | br1 +------+ +-------+ +-----------+ +---------+------->|VE102 | |br0 | | |VLAN br0.110 +------+ v +---------+ |VE103.110| +---------+ I can't make VLAN work on br0 (br0.110) and I would like to understand why. I don't have any switch so no problem with unmanageable switch. I've configured a VLAN interface on OpenBSD in /etc/hostname.vlan110: inet 192.168.110.254 255.255.255.0 NONE vlan 110 vlandev sis1 And it seems to be working fine. I've also adapted my PF configuration to work with VLAN but I don't see any incoming traffic. On my Debian Lenny, here is my interfaces configuration : # The loopback network interface auto lo iface lo inet loopback # br0 auto br0 iface br0 inet static address 192.168.100.1 netmask 255.255.255.0 gateway 192.168.100.254 network 192.168.100.0 broadcast 192.168.100.255 bridge_ports eth0 bridge_fd 9 bridge_hello 2 bridge_maxage 12 bridge_stp off # VLAN 110 auto br0.110 iface br0.110 inet static address 192.168.110.1 netmask 255.255.255.0 network 192.168.110.0 gateway 192.168.110.254 broadcast 192.168.110.255 pre-up vconfig add br0 110 post-down vconfig rem br0.110 It looks OK, but when I start my VE, here is the message: ... Configure veth devices: veth103.0 Adding interface veth103.0 to bridge br0.110 on CT0 for VE103 can't add veth103.0 to bridge br0.110: Operation not supported VE start in progress... So I've got one error here. I've followed this documentation http://wiki.openvz.org/VLAN but it doesn't work. I've certainly missed something but I don't know why. Someone could help me please? Thanks

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• QMail do not delivery to remote mailboxes for my own domain

  - by lorenzo-s

  Sorry for the title, I don't know how to sum up this situation. I have a web server at mydomain.com, running qmail for website related mail delivery (i.e. newsletter, sign up confirmation, etc). qmail here is used only to send mails, because I have a fully working Google App Gmail associated with mydomain.com for normal email receiving. qmail runs fine when sending email to remote addresses, for example to [email protected], but fails when sending to [email protected]. I think it's because the server thinks that he have to manage mailboxes for mydomain.com locally, instead of redirect them to Gmail. Here is the /var/log/qmail/current for two email: the first one is sent without problems to example.com, second one fails because it's for mydomain.com: 2012-11-15 15:04:11.551933500 new msg 262580 2012-11-15 15:04:11.551936500 info msg 262580: bytes 5604 from <[email protected]> qp 5185 uid 33 2012-11-15 15:04:11.575910500 starting delivery 316: msg 262580 to remote [email protected] 2012-11-15 15:04:11.575912500 status: local 0/10 remote 1/20 2012-11-15 15:04:12.189828500 delivery 316: success: 74.125.136.27_accepted_message./Remote_host_said:_250_2.0.0_OK_1352991894_j49si13055539eep.9/ 2012-11-15 15:04:12.189830500 status: local 0/10 remote 0/20 2012-11-15 15:04:12.189831500 end msg 262580 2012-11-15 16:49:20.270332500 new msg 262580 2012-11-15 16:49:20.270336500 info msg 262580: bytes 2192 from <[email protected]> qp 5479 uid 33 2012-11-15 16:49:20.315125500 starting delivery 323: msg 262580 to local [email protected] 2012-11-15 16:49:20.315128500 status: local 1/10 remote 0/20 2012-11-15 16:49:20.320855500 delivery 323: failure: Sorry,_no_mailbox_here_by_that_name._(#5.1.1)/ 2012-11-15 16:49:20.320858500 status: local 0/10 remote 0/20 2012-11-15 16:49:20.372911500 bounce msg 262580 qp 5484 2012-11-15 16:49:20.372914500 end msg 262580 As you can see, it says: Sorry,_no_mailbox_here_by_that_name I can't say he's wrong :) How to solve this? How to let Google App Gmail manage incoming email for mydomain.com for messages sent by mydomain.com qmail server?

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• Ubuntu 12.04 open port 80 inside WLAN

  - by Eduard

  I have an nginx server running on ubuntu 12.04 that serves http through port 80 and https through port 443. Everything works fine if I access it from the same computer via localhost, 127.0.0.1 or the local IP 192.168.0.11. If I try to access the server from another computer in the same VLAN it does not work for http; it works for https. I have changed my nginx configuration to also listen to port 8000 for http; I can then access http from the other computer in the same VLAN via "http://192.168.0.11:8000". I also have a web server running on port 80 on a windows machine and can access it from another device in the same VLAN, therefore the router is not blocking incoming http traffic. The nginx process is run by root. I have used tcpdump and I see that packets are arriving to Ubuntu: 192.168.0.16.49735 192.168.0.11.80 and that some response is being given 192.168.0.11.80 192.168.0.16.49735 (I do not know what the response is though). There is no request arriving at the nginx web server (I have checked the access log). I have iptables empty. I have unsuccessfully tried to find a solution for a long time to this, it has now become a matter of happiness or bitterness :).

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