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  • "IP May Be Forged" - Sendmail Warning

    - by Mikey B
    CentOS 5.x | SendMail 8 Can I get clarification on what exactly the warning "IP may be forged" means and what conditions cause it? I recently configured SendMail to relay email from my exchange server and it's showing that warning in the logs. The messages get delivered fine but I don't like the warnings. I originally thought that there was an inconsistency between the servername used in the EHLO statement from Exchange and the respective PTR record for the source IP for Exchange. But upon examining a packet capture, I see exchange using "EHLO domain.com" and that the source IP has a PTR of "domain.com". Maybe sendmail doesn't like that the greeting only has the domain? -M

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  • Trouble Connecting to Virtual Machine after IP address Change

    - by David
    I have a VMware image running a copy of Fedora 11 which is hosted on a remote server. The remote server recently had its IP address change. I'm now unable to connect to my virtual machine. The server admin assures me that my virtual machine is running and assigned the new IP address. I have checked the firewalls and had the remote admin restart the VM instance. Neither of these fixed the problem. How do I troubleshoot a remote server which I am unable to SSH to? I'm actually even unable to ping the remote IP (connection timed out).

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  • Windows Server 2008: Limit UDP/TCP packets per IP or ban

    - by WBAR
    How I can limit UDP/TCP packets per IP send to my host (or better PORT) per second or minute ? Would be nice to ban that IP for 12/24 hours or even for ever. I got Windows Server 2008 and I'm very poor in Windows administration but quite good in Linux. EDIT: By basic problem is that They sending a lot of rubbish UPD and TCP packets.. TCP packets without SYNCH, fragmented UDP packets so my servers stop responding.. So I need to cut off users (IPs) sending more than X packets per second. I need solution witch provides me, somehow, configurable: X packets of certain type (UDP, TCP or both - lets say parameter named Z ) are allowed to be received by IP on Y port, otherwise this packet should be DROPPED. My virtual hosts are hosted by VirtualBox and I'm able to forward all incoming packets certain type and certain port to the specific Virtual Host, but I need to DROP them before my VirtualBox receive them.

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  • Apache will not start after IP change

    - by Doron
    I'm running CentOS 5.8 and I had to change my server's IP address. Afterwards, I'm unable start Apache. I am also running virtualmin. The error I'm receiving is: Failed to start service Starting httpd: httpd: Could not reliably determine the server's fully qualified domain name, using 184.106.146.125 for ServerName (99) Cannot assign requested address: make_sock: could not bind to address 50.56.33.100:8080 no listening sockets available, shutting down Unable to open logs I edited my httpd.conf to point to the new IP address like such: #Listen 12.34.56.78:80 Listen 184.106.146.125:80 And looking at the error it still seems to be referring to the old ip address (50.*).

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  • Multiple IP Addresses on a Traceroute Line

    - by Paul
    I'm doing a traceroute from my box to ....say.... stackoverflow.com. I see a couple of instances where there are multiple ip's on one line. For instance, in below, line #2 has two IPs: 10.1.6.5 and 10.1.4.5 Also on line #4, there are two timestamps after 216.182.236.96: 0.653 ms and 0.637 ms What are these? This is on Linux Traceroute example: traceroute to www.stackoverflow.com (198.252.206.16), 30 hops max, 60 byte packets 2 ip-10-1-6-5.us-west-1.compute.internal (10.1.6.5) 0.329 ms 0.425 ms ip-10-1-4-5.us-west-1.compute.internal (10.1.4.5) 0.471 ms 4 216.182.236.104 (216.182.236.104) 0.554 ms 216.182.236.96 (216.182.236.96) 0.653 ms 0.637 ms 5 205.251.230.64 (205.251.230.64) 0.616 ms 205.251.229.232 (205.251.229.232) 1.305 ms 205.251.230.64 (205.251.230.64) 0.573 ms

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  • Windows Server 2008 firewall rules order problem

    - by vnuk
    I have one rule that opens FTP port for all connections. I have second rule that blocks ALL connections on ALL protocols for some IP's. However, connections from those IP's that are blocked can still connect to FTP port because that rule obviously takes preccedence. How can I make this work, because I do not see how can I adjust order of rules on Windows Firewall.

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  • [Nameservers] Can I setup 5 ips to 1 server and have only 2 nameservers?

    - by Tyler
    So I have 1 computer with 5 IP's and around 15 sites being hosted. I have 4 of the ips setup to be dedicated for 4 sites and the rest share the 5th ip. When I'm setting up my name server, do I set it up at Godaddy my Registar or on my server's dns or both? Can I just setup NS1 - Add all the ips NS2 - Add all the ips And just have all the sites use those two name servers?

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  • How come I can't redirect TCP ports on this wireless router?

    - by George Edison
    I am configuring a router to redirect TCP port 5900 (yes, this is for VNC) to a specific IP address on the network. Here is what I have: From a local computer on the same network, I can telnet to 192.168.1.64 (port 5900) just fine. However, when trying to telnet to the machine (port 5900) using its external IP address, it doesn't work. (The connection times out.) The router is a Gigaset SE567, if that helps.

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  • Finding spoofed IP address on network

    - by Jared
    I have a few IP spoof dropped messages coming out of my Sonicwall firewall, we'll call them Source A and Source B. Both of these sources have the same mac address indicating they're coming from the layer 3 switch behind my firewall. Source A has an ip within a valid subnet on my network and it shows up in the ARP table of my layer 3 switch. I was able to trace the exact location and fix the issue. Source B's ip however, is not within valid subnet on my network and it's not showing up in my layer 3 switches arp table. Any idea how I can trace the location of this device within my network? Thanks in advance.

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  • my domain.com is pointing to two different IP addresses

    - by user43726
    Initially my domain , mycompany.com points to this IP: - 123.456.789.101 (sample only) Then i got another VPS and then decided to move the mycompany.com into this new IP/Host: - 987-654-123.123 (sample only) I changed the necessary stuff like DNS, etc. from my domain management panel. But when i ping it : ping mycompany.com , sometimes it gives the first IP, sometimes the second one. Also when i visit the url from the browser, sometimes it loads, sometimes it doesn't. How can i solve this? Please help. Thanks

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  • Block ip for long time

    - by Tiziano Dan
    This question is about a iptables, I wanna to know how can I block these ip for 1hour and not only a little time.. because they make to many sql requests, I'm using it for block but it's not enough because there's anyway 100k ip who attack then too much requests for sql server. iptables -N SYN-LIMIT iptables -A SYN-LIMIT -m hashlimit --hashlimit 8/second --hashlimit-mode srcip --hashlimit-name SYN-LIMIT -j RETURN iptables -A SYN-LIMIT -j DROP iptables -I INPUT -p tcp --dport 80 --syn -j SYN-LIMIT iptables -I INPUT -p tcp --dport 80 -m connlimit --connlimit-above 6 -j REJECT --reject-with tcp-reset How can I make the same but block IP for long time ? (Not manually !)

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  • How to best configure IIS7 logging to capture "HTTP_X_FORWARDED_FOR" header

    - by zeroasterisk
    We have IIS7 servers sitting behind an nginx reverse proxy. The reverse proxy is sending the standard "HTTP_X_FORWARDED_FOR" header with the visitor IP address, but IIS7 logging is only logging the IP address of the nginx server (which makes sense, but it's not what I want). How can I tell IIS7 to instead log the "HTTP_X_FORWARDED_FOR" header (or additionally log it)? (note: I'm a linux admin, not a windows one, so explicit instructions & links are sincerely appreciated)

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  • Cannot access shares via \\servername but \\ip works

    - by Jeff
    To set up the scenario: One of our techs set one of the domain controllers to use Microsoft time. The time IS correct (including Time Zone) and DOES match the other domain controller's time; it was previously incorrect, however. Since the change, no users can connect via \\servername\share or \\servername.domainname.com but \\ip\share works fine. I cannot even access it from the other domain controller with which I know both have the same time. The servername DOES resolve to the correct IP address. Also, strangely enough, \\domainname.com works as well which resolves to the same server. Finally Everything that I have tried does resolve to the same, correct IP address. The error is: login failure: The target account name is incorrect. I believe it is time related but since the times are correct and match I'm not sure. Anyone know what might cause this?

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  • Unable to change IP address for eth0 without restart in Ubuntu

    - by Rodnower
    I have Ubuntu 12.04.1 installed. I tried to change the IP address of the interface eth0 in /etc/network/interfaces from 192.168.1.3 to 192.168.1.4 auto lo iface lo inet loopback pre-up iptables-restore < /etc/iptables.up.rules auto eth0 iface eth0 inet static address 192.168.1.4 gateway 192.168.1.1 netmask 255.255.255.0 network 192.168.1.0 broadcast 192.168.1.255 sudo service networking status When I issue: sudo service networking restart I get this response: stop: Unknown instance: networking stop/waiting And IP remains 192.168.1.3: eth0 Link encap:Ethernet HWaddr 00:1e:33:71:cd:a4 inet addr:192.168.1.3 Bcast:192.168.1.255 Mask:255.255.255.0 inet6 addr: fe80::21e:33ff:fe71:cda4/64 Scope:Link UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:3861 errors:0 dropped:0 overruns:0 frame:0 TX packets:3291 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:3423285 (3.4 MB) TX bytes:521854 (521.8 KB) Interrupt:45 Base address:0x4000 Only after restart does the IP change. Any ideas?

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  • Port Forwarding IPTABLES public IP

    - by tric
    hello i have a computer linuxbox_1.eth0 public ip 89.40.x.y eth1 public ip 85.121.a.b i have another linuxbox_2. ethx public ip 86.34.c.d what i want to do is forward port 8001 from linuxbox_1 eth0 89.40.x.y:8001 to linuxbox_1 eth1 85.121.a.b, and then forward again port 8001 from linuxbox_1 eth1 85.121.a.b:8001 to linuxbox_2 ethx 86.34.c.d:80 i have searched for answers using google "that knows everything" but this time it has failed. i would like to use IPTABLES or any other tool like rinetd. i tryed rinetd but it somehow mistakes the eths sorry for my bad english. 10q

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  • Safari 7 SSL error if using IP-adress

    - by K. Biermann
    I have created my own CA for internal usage and set the root certificate to trustworthy on my machines. With this CA I signed the SSL-certificates for my internal servers. I only address them with their IP and so I used the servers' IP as certificate name. If i connect to the Servers with Chrome or mobile Safari it works without problems, but if I use Safari 7 under Mavericks (on the same machine with the same keychain) i get the following error: "The certificate is not valid (host name mismatch)". I double checked that I entered the correct IP ("https://192.168.2.130"), but I always get the same error. Do I need to enter a different name for the certificate or is it just that Safari doesn't support SSL certificates for IPs? Here is a screenshot of the error message (I can only post images with at least 10 rep): Safari's error message Thanks in advantage and please excuse my bad English :D

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  • how can 192.168.2.10 talk to 172.18.156.65 ?

    - by steve
    from what i understand, all computers need to be in the same subnet /24 so how would i get a computer to be able to connect to another computer that is set as 172 ? one computer is behind a firewall, the other is connected to a HUGHES sat dish and has the IP of 172 would I need to setup a ROUTE in a firewall between the 2 computers, to say "if you are trying to get to 172.18.156.65 then use the ip address 192.168.2.65 and translate it to 172.18.156.65" the firewall is a netgear, if I should use a ROUTE, then I'll try to learn it from the manual thanks

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  • URL Based Internal Redirecting

    - by bculverscate
    Basically, we have one external IP address, several servers internally and want to redirect to each internal server based on request URL. We do not want to install another piece of hardware to do this for us but we have a firewall running Linux that currently forwards to only one of the internal servers. Example of our setup can be seen here: http://img23.imageshack.us/img23/5469/drawing1br.jpg NOTE: domain.com does not point to this box nor would we like it to. Subdomains are pointed manually to our global IP address.

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  • Unable chage IP address for eth0 without restart in Ubunto

    - by Rodnower
    I have Ubuntu 12.04.1 installed. I try to change IP address of the interface eth0 in /etc/network/interfaces from 192.168.1.3 to 192.168.1.4: auto lo iface lo inet loopback pre-up iptables-restore < /etc/iptables.up.rules auto eth0 iface eth0 inet static address 192.168.1.4 gateway 192.168.1.1 netmask 255.255.255.0 network 192.168.1.0 broadcast 192.168.1.255 sudo service networking status Now I issue: sudo service networking restart I have response: stop: Unknown instance: networking stop/waiting And IP remains 192.168.1.3: eth0 Link encap:Ethernet HWaddr 00:1e:33:71:cd:a4 inet addr:192.168.1.3 Bcast:192.168.1.255 Mask:255.255.255.0 inet6 addr: fe80::21e:33ff:fe71:cda4/64 Scope:Link UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:3861 errors:0 dropped:0 overruns:0 frame:0 TX packets:3291 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:3423285 (3.4 MB) TX bytes:521854 (521.8 KB) Interrupt:45 Base address:0x4000 Only after restart IP changing... Any ideas?

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  • Binding MySQL to run from the public or private LAN IP address - which one is faster

    - by Lamin Barrow
    So we have 2 servers all running at the same web host. We have bind MySQL to listen on the public ip-address of the database server and the web server connects to it from the public ip. Both servers run on the same private network. Currently, the DB connect method from our php script takes about 3ms to connect to the MySQL database server host. My question is, would MySql data interaction from the web server be faster if we bind it to listen on the private lan address on the database server instead of the public IP? or is it the same regardless and it wont make a different.

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  • Iptables - Open Port Only for one Server IP (allow connections from a specific range)

    - by user1015314
    My server has multiple IPs, 1.1.1.1 1.1.1.2 and i have a service which listens to a port e.g. 88 Now i want, when somebody from outside, wants to connect to the port, that he can only connect, to that port, if he connects to the ip 1.1.1.2:88 but if he tries to connect to 1.1.1.1:88 it should not react and it should look like that it dont exists and drops all connections. Ok, than i need for 1.1.1.2:88 that only allows a specific ip range outside connecters. for example only 9.*.*.* can connect to that port and ip. I'm using Centos. Thank you for your help.

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  • Disable Network settings (TCP/IP & DNS) on Windows 7 Ultimate

    - by TiD91
    i also read this discussion here How to disable Tcp/Ip settings in windows 7 via GPO? about what i want to do but i still have problems. So here i am: i have a desktop pc with two accounts, both with Administrative rights. One is used by the entire my family, in particular by my brother. The problem is that i set some DNS and IP configurations to let be possible the VNC connection from remote. Now i would like to disable the network settings (TCP/IP and DNS) to prohibit my brother to change it preventing me to connect to it. So how can i do this? I set the policies from GPO but i still can change these settings from his account. Here's a pic of Registry Keys: http://imageshack.us/a/img339/3310/famigliapc2012092017274.png what didn't i do? Thanks in advance for your help. Rub|TiD

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  • Setting primary IP for VPS (out of 2 available)

    - by Flyer
    I've got a little problem. My VPS (Debian box) has 1 primary IP address, but now my hosting provider decided to assign me another one due to problems with first one. Let's say new IP is 91.222.152.20 and old one 91.221.190.170. How should I make 91.222.152.20 primary one, so that everything works on this address instead of 91.221.190.170 (like ftp, mysql etc) I tried editing /etc/newtwork/interfaces setting iface eth1 inet static address 91.222.152.20 netmask 255.255.252.0 network 91.222.152.0 broadcast 91.222.155.255 gateway 91.222.152.1 I know that network is 91.222.152.0/22 so I assume that above configuration should be right. Saved, rebooted and that ended pretty bad. Couldn't even ping box on old or new IP. Had to revert to working one. So question is. What am I doing wrong and how to do it right?

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  • linux static ip problem

    - by out_sider
    I have a serve running centOS and I'd like to have the following setup: The server needs to have a static ip and be accessible by name. What I want is independently of the network being able to connect the server to the network and access it by name on Firefox as it will be running a web page. I tried setting the ip manually but while the inet addr is set as I want it the Bcast isn't. And I only can ping the server on the Bcast ip and because it is 192.168.2.255 ssh says it's not valid.

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  • Limit access on login and IP in .htaccess

    - by Rob
    There are many examples showing how to use .htaccess to restrict users by login or on their IP address (i.e they are ok from the ones given without authorisation). For some reason the following is never mentioned, yet it seems quite useful. How do I restrict using groups and ip, e.g. group1 can access the page from anywhere group2 can access the page only from certain IP addresses if you are not logged on, you cant see the page, regardless where you are I would like to have all 3 of these working at the same time.

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