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• Why would my router have different MAC addresses for IP and IPv6 transactions?

  - by user329161

  Today I was using tcpdump and I noticed my computer was having IPv6 traffic with a particular MAC address that I could not match with an IP using nmap or arping. After looking at the tcpdump logs a little more closely, I figured out it was another MAC address my router was using but exclusively for IPv6 traffic. 22:49:01.936830 90:0d:cb:ff:31:91 (oui Unknown) > 33:33:00:00:00:01 (oui Unknown), ethertype IPv6 (0x86dd), length 158: fe80::920d:cbff:feff:3191 > ip6-allnodes: ICMP6, router advertisement, length 104 Why would a router offer a different MAC address for IPv6?

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• Packet logging on PIX firewall

  - by georged.id.auindex.htm

  We have a Cisco PIX 515 firewall and I would like to set up a simple logging that would give us a traffic breakdown for billing by: source destination protocol port size time PIX is plugged into Catalyst 2970 and I was told that the best thing since sliced bread for logging is to get Netflow and get Catalyst to log. My concern, however, (besides the Netflow cost) is that I really don't want to "listen" to the internal noise and all I'm interested in are the external traffic stats above for billing and analysis purposes. What would be the simplest and the easiest solution? Cheers George

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• Cisco ASA - VPN and Hairpinning....

  - by Nordberg

  Hi, We have 2 sites that will be linked by a IPSEC VPN between 2 Cisco ASAs: Site 1 8Mb ADSL Connection Cisco ASA 505 Site 2 2Mb SDSL Connection Cisco ASA 505 Basically, both sites need access to a service at the end of another IPSEC VPN, Site 3, which I plan to terminate at Site 2. This is due to the way the service is sold - it's billed per gateway. So if both Site 1 and Site 2 had their own VPN connection to Site 3, it would cost us twice as much... Anyway, my idea is to have all traffic from Site 1 destined for Site 3 to go via the VPN between Site 1 and Site 2. The end result being all traffic that hits Site 3 has come via Site 2. I understand this is known as hairpinning but I'm struggling to find a great deal of information on how this is setup. So, firstly, can anyone confirm that what I'm trying to achieve is possible and, secondly, can anyone point me in the direction of an example of such a configuration? Many Thanks.

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• NFS or GFS for LVS 10 Server Setup

  - by Michael Robinson

  Currently we have a 10 servers LVS hosting setup. The people we hired to set it up did not anything about GFS which was our preferred Central Storage File System Solution. As we have tight time constraint, we just told them to use whatever they were familiar with which is NFS. I have since done some research and it seems that NFS is not ideal for the type of high traffic site we are hoping to build. I couldn't find much info online about the signaficance differences between the 2. As we to setup all servers again right now, should we stick with NFS or find someone who knows how to setup GFS amd go with that. We need a setup that is highly reliable and scalable as we intend. As after initial setup is done, we expect high increases in traffic and load.

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• windows server 2008 vs ubuntu 11 [closed]

  - by user472875

  I am working on implementing a custom server application that should be capable of handling a very large volume of traffic. I am aware that this type of question has been asked a lot, but I haven't been able to find a good answer. What I'm really looking for is for a server with given specs which OS will be able to handle a larger traffic faster and more reliably. I do not care about rights management or any other features. I am fairly good with both platforms, and so I would like to pick the OS with better performance on a clean install, and with nothing else running. Thanks in advance.

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• TCP Proxy on windows supporting SOCK5

  - by acidzombie24

  I been using privoxy just fine for the moment. However now i need to redirect non http traffic through a proxy that supports SOCK5. I looked at RINETD and spent some time googling (which led me to a SF question suggesting RINETD) but i couldnt figure out how to make it work. Specifically how to give it a listening port for my .NET apps to connect to and the SOCK5 proxy addr/port to connect to (.NET does not support using SOCK5 which is why i need a proxy). What is a simple to use proxy on windows? It must support TCP traffic (instead of only http) and supports SOCK5. -edit- portable solution preferred. I should be able to run it on my usb stick under a limited user.

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• can Snort be installed on VPS?

  - by jack

  Hi Linux Admins I want the maximum security for my linux vps. I found many tutorials round the net but it doesn't cover the Snort. Only those like portentry, logsentry, tripwire and so on. So I'm beginning to think that Snort is not appropriate for a linux host. I think it's suitable only as a proxy/middle-man that checks traffic before passing to acutual targets. I'd like to whether Snort can be installed on VPS which serves typical servers like web/mail. Can Snort be in complict with OSSEC which I think it doesn't check the traffic but the log files only for Intrusion Detection/Anomaly? Thank you.

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• Unable to access internal network through PfSense WAN port

  - by Sean

  Our branch office is unable to connect to our internal network for some reason. However we can connect to the branch office domain controller from behind PfSense. The following is our setup: |Branch DC - 192.168.0.101 | |Branch Firewall - 192.168.0.2 | |(Internet) | |Local Firewall - 192.168.3.1 | |PFSense WAN port - 192.168.3.100 |PFSense LAN port - 192.168.1.1 | | DC1 - 192.168.1.2|DC2 - 192.168.1.4 Branch DC can ping and connect to PFSense WebGUI on the WAN port successfully (we set this up using the PfSense documentation). DC1 and DC2 can connect outbound to the Branch DC. There seems to be a rule that prevents internal access on the WAN port. However our rules are set to allow all traffic on the LAN and WAN ports. It would be ideal to just disable the firewall altogether since we already have a firewall but when we do this, PfSense doesn't allow any internal traffic at all. I look forward to any assistance and thank you ahead of time.

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• How can I secure Postgres for remote access when not in a private network?

  - by orokusaki

  I have a database server on a VMWare VM (Ubuntu 12.04.1 LTS server), and it just occurred to me that the server is accessible via the web, since the same physical server contains a VM that hosts public websites. My iptables in the database are such that only SSH traffic, loopback traffic, and TCP on port 5432 are allowed. I will only allow host access to the Postgres server from the IP of the other VM on the same physical machine. Does this seem sufficient for security, assuming there aren't gaping holes in my general OS configuration, or is Postgres one of those services that should never be web facing, (assuming there are some of "those"). Will I need to use hostssl instead of host in my pg_hba.conf, even though the data will travel only on my own network, presumably?

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• Load balancing two web servers with ultra monkey

  - by Mark L

  Hello, In 2006 a company I was working with setup two load balancers to balance traffic between two web servers. We used ultra monkey to do so. I'm hoping to do the same now. My question: Would anyone recommend using ultra monkey to balance traffic between two linux boxes running apache? Are there other linux-based alternatives which have since proven to be better for this task? Would you still install debian sarge on a load balancer given it's age? Thanks everyone!

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• monitoring TCP/IP performance on Solaris

  - by Andy Faibishenko

  I am trying to tune a high message traffic system running on Solaris. The architecture is a large number (600) of clients which connect via TCP to a big Solaris server and then send/receive relatively small messages (.5 to 1K payload) at high rates. The goal is to minimize the latency of each message processed. I suspect that the TCP stack of the server is getting overwhelmed by all the traffic. What are some commands/metrics that I can use to confirm this, and in case this is true, what is the best way to alleviate this bottleneck?

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• How to configure QoS on home router

  - by Joril

  I have a USR9105 router and I'd like to configure its QoS to prioritize web traffic (browser) over everything else (e.g. torrents). I'm confused by its interface though: "IP precedence" allows selecting a number from 0 to 7, while "IP type of service" can be one of "Normal Service", "Minimize cost", "Maximize reliability", "Maximize throughput" and "Minimize delay". How should I set it up? Is QoS the wrong solution to avoiding torrents slowing down browsing to a crawl? Should I set up a proxy and traffic shaping instead?

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• How to configure QoS on home router

  - by Joril

  I have a USR9105 router and I'd like to configure its QoS to prioritize web traffic (browser) over everything else (e.g. torrents). I'm confused by its interface though: "IP precedence" allows selecting a number from 0 to 7, while "IP type of service" can be one of "Normal Service", "Minimize cost", "Maximize reliability", "Maximize throughput" and "Minimize delay". How should I set it up? Is QoS the wrong solution to avoiding torrents slowing down browsing to a crawl? Should I set up a proxy and traffic shaping instead?

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• Dell powerconnect 6224 vlan routing

  - by user1007727

  I have a small network and I need help with routing .. . My VLANs VLAN 1010 SALES VLAN 1020 HR I have assigned the above vlans to a tagged port and I have added a default route to send the traffic of to my firewall. ip route 0.0.0.0 0.0.0.0 10.10.10.10 I have added a new vlan VLAN 1030 Services and I would like its traffic to go to a different interface on the firewall, 10.10.10.20 how can I go about doing that? can someone give me an example? your help is highly appreciated. Thank you

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• Wrong source IP when accessing internet directly from TMG server

  - by jarod1701

  Hi everyone, after implementing a ForeFront TMG server I'm facing only one problem: After I added a second IP to the external adapter I had to manually set "NAT Address Selection" inside the network rule "Internet Access" to the first IP since all others would get blocked by the CISCO firewall. This configuration works as long as traffic comes from the internal network (e.g. browser on clients). Traffic from the TMG directed to the internet always carries the second IP as it's source address and gets blocked. All our other TMGs/ISAs are running fine and I never came across this problem- Does anybody have a clue, coz I don't?! Kevin

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• VLAN trunking between Juniper EX -> Cisco Catalyst -> and Cisco Router

  - by Hugo Garcia

  I have the following scenario: EX2200 Switch whit ge-0/0/6 set as an access port on VLAN 80 ge-0/0/0 set as a trunk port connected to a catalyst switch and various vlans allowed to pass includin vlan 80 On the Catalyst Switch. port #3 set up as a trunk port that receives traffic from the EX switch. port 46 is set up also as a trunk port that connects to a cisco router. Port #48 is where the host used to be connected host - EX2200 - Catalyst - Router the problem is that this EX2200 is a new addition to the network and the host connected previosly to the catalyst switch. traffic is not getting from the host to the router, but the router can send ARP request to the host. following is the relevant configuration: Catalyst Switch: interface GigabitEthernet1/46 switchport trunk encapsulation dot1q switchport trunk allowed vlan 80,82,83,93,289 switchport mode trunk mtu 1532 media-type rj45 speed 1000 duplex full arp timeout 300 ! interface GigabitEthernet1/48 switchport access vlan 80 switchport mode access mtu 1532 media-type rj45 speed 100 duplex full arp timeout 300 no cdp enable ! EX2200 Switch:

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• Recover from running "route -f"

  - by James L.

  I was trying to capture localhost traffic with Ethereal, which doesn't work without re-routing localhost traffic to your router gateway. I didn't get the route command quite right, and messed up my routing table. I typed route -f to clear the routing table and rebooted, but when I finished rebooting, the routing table wasn't restored to its original state. I didn't use the -p parameter, so none of my changes should have persisted after a reboot. What can I do to restore the routing table to its default routes?

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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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• Multi sim GSM modem or alternative

  - by Ando

  I'm trying to administer the SMS trafic of my businesss centrally through a web portal. In Europe (except UK) we don't have a numbers/SMS trafic provider like Twilio or Clickatell, nor any build in way to administer the SMS traffic for a number via http, so I will have to buy the long numbers and administer the SMS traffic myself. For this I was looking into a hardware solution for hosting all my SIM cards - I have like 400 sims cards (= numbers). I saw that GSM modems might fit in but they don't seem to scale up very well. Could you recommend me a GSM modem? If this is not the best way to approach this, what would my alternatives be? Thanks in advance

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• Recommendations for VMWare web server environment with load balancer.

  - by Ben

  We run IIS websites on a VMWare production server that pull image content and video content from a separate IIS instance on another server (media server). The media calls (images and video) are straight http:// calls and not using a streaming application. During peak traffic periods, we clone the production server five times and have a load balancer distribute traffic to all five production servers. The media server does not get ramped up. We noticed that the processing and resources on the media server gets very taxed during this period. Would it make sense to run the IIS instance for the media server locally on the production server and have it cloned with the production servers, then have a rule on the load balancer negotiating these media calls from the website? Would it be better to allocate more resources (memory and CPUs) to the media server VM and not clone it with the production servers? Recommendations are sincerely appreciated.

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• How can I fix my Virtual PC 2007 network configuration

  - by DanJ

  Hi, I have installed Windows Virtual PC 2007 on my Windows 2003 R2 Server. I have installed a virtual Windows XP. I have configured the virtual PC to use Shared Networking (NAT) I have disabled the firewall on the virtual windows XP The problem: I am unable to PING from Windows 2003 (the host) to the Windows XP (virtual) I do have normal traffic from the virtual to the internet Could this problem be related to routing? How I can I fix this network configuration to allow for the following traffic: 1. From Virtual to Internet 2. From Host to Virtual 3. If possible, from Internet to Virtual on pre-defined ports (port forwarding?) Thanks

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• Best way to bring a system down with a "maintenance" message?

  - by iftrue

  What's the best way to bring down an apache2/tomcat6 setup for maintenance? Specifically, apache2 can stay running, but tomcat needs to restart to accomplish a number of tasks. My initial thought is to change the root directory in the httpd.conf VirtualHost entry to point to a new location, then issue a force-reload command to direct traffic away from the actual tomcat application. After some period of time, I perform tomcat maintenance, switch the VirtualHost entry, and force-reload to begin directing traffic back. Is there a better way to do this? I'm looking to start work on a rather extensive web application, and my deployment procedure right now involves shutting everything down and bringing everything back up. Is there a better way to do this than what I've proposed?

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• Java application server behind IIS 7.5 on Windows Server 2008

  - by perissf

  I have a Java application server (GlassFish, indeed, but the problem is the same for any other application server, I guess), running on port 8080. And I have IIS 7.5 listening on port 80 as by default configuration. I want to avoid people typing the port because it's unprofessional. So I want that when somebody types http://myserver the traffic is directed to IIS. And this is how it already works now. But I also want that when somebody types http://myserver/java the traffic is directed to port 8080 and consequently my GlassFish splash screen is displayed. If I have deployed an application on GlassFish under context root app1, typing http://myserver/java/app1 should access the application. How can I do this? I have tried with adding some rules with the URL Rewrite utility from IIS7.5 UI, but this shows the port after the rule has rewritten the url, and I want to avoid it.

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• Should I Use PHP as FastCGI?

  - by Synetech inc.

  Hi, I am running an Apache webserver on my Windows machine. It is not generally a public server (most of the little bit of traffic comes from the machine itself, and most of the public traffic comes from crawlers). Basically, it is mostly just for use as a test-bed, development system. I have read about how running PHP as FastCGI is better (ie faster and more stable) than as an Apache module. However, I really don’t like the idea of multiple PHP.exe processes (I don’t like that Apache has two processes and I’m not even too thrilled with Chromium’s multi-process model). So I’m wondering if it would be worthwhile to change PHP to FastCGI for this scenario. If it is, how would I configure it? Pretty much all of the information I have seen has been either for non-Windows or for IIS. As I said, I’m running Windows+Apache. Thanks a lot.

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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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