I have a server hosting with in a DC and I have two subnet on 1 VLAN. how can I add all the IPs from these two subnet in one go? lets say for instructional purpose they are 192.168.0.0/24 and 192.168.1.0/24
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Connecting two networks with ipsec on this manual [URL] The two networks are connected, everything works, the question is as follows: For a gateway to multiple subnets, I have access to only one subnet is listed in / etc/sysconfig/network-scripts/ifcfg-ipsec0 DSTNET = 192.168.2.0/24. How do I get access to all the subnets?
View 2 Replies View RelatedCan anyone here point me to a walk-through or discussion of how to use Webmin to set up port forwarding/NAT on a dual-NIC Centos 5.3 box? The layout will be simple:
Internet --- NIC1 [CentOS Box] NIC2 --- Switch to other PCs
We have a BUNCH of exposed services that are on special ports -- for example, to connect to one machine, you go in with [IP_Address]:12000, and to connect to another, [IP_Address]:12002, etc., etc. We're currently using OpenSuse 10.3 on this box, and YaST makes this criminally easy (you give it the incoming port number and the destination IP/port numbers and it just works). But OpenSuse 10.3 is nearing EOL, we're buying a new machine, and I'd like to use CentOS on the new one.
I've read the sparse Webmin documentation in their Wiki, and it leads one to believe that you simply insert a "NAT" rule. But there's obviously something they're leaving out. I *am* opening the ports in the firewall. But when I log in to [IP_Address]:port, it just times out. The port forwarding never occurs. The test in this case is SSH, and I know that SSHD is working properly because I can log into that machine just fine from another PC on the same internal subnet.
i am not able to port 8080 on my CentOS VPS server.I have followed all the instuctions as mentioned on iptables wiki page.Also I am able to telnet my ip address and port number, But can not access from browser.
View 6 Replies View RelatedPl can anyone guide me to connect centos 5.5 using ethernet port to ADSL Broadband modem which is configured in PPPoe mode?
View 19 Replies View RelatedHow I add this " iptables -F " to my Servers boot I already asked this from my Provider, but it seams he forget each time I ask.
View 3 Replies View Relatedwe are going to install ASTERISK remotely, hence the port 22 in the server has to be open ,Can somebody reply me with exact commands?I tried these commands and got these results
Command : cat /etc/services | grep xxx
Result : No Such file or directory
Command :netstat -nan | grep 22
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I have a firewall between two different subnets. The reason for the second subnet within the internal network is because I have a mail server that I want to protect. However, we need to make sure that the mail server can communicate with the internal network as well.
Mail server is 192.168.100.100
Firewall is 192.168.100.1 and 10.110.101.5 (and its gateway is 10.110.101.1 to the router)
I go to another workstation and ping the mail server. I can't. It times out. I do the same from the mail server. It times out as well.
I have a 2-floor house, with a single ethernet cable from the ground floor to the 1st. Downstair there is my ADSL modem, which is connected to the router upstair through this one cable. Now, I would like to have some more ethernet ports on the ground floor, but there's no room left to run another cable between the floors, so here's the big question: can I run both the modem-router connection and my regular LAN (which are on different subnets) through that one cable, with a switch at both ends?
To make it a little more clear, here is my present configuration
Code:
DOWNSTAIR UPSTAIR
ADSL Modem ------- Router --- Clients
Here is what i would like to do:
Code:
DOWNSTAIR UPSTAIR
ADSL Modem ---- Switch ------ Switch ----(WAN Port) Router --- Clients
Clients ---- ----(LAN Port)
Would it work?
I have two subnets which I am interested in connecting.
Some basic network details:
Subnet A:
Subnet B:
I am trying to think of any further relevant details, but that seems to be it to me. If I forgot anything, please tell me.
Ok the question. WHAT do I type? (Explicitly!) And WHERE do I type it? In order to reach ubuntu-01.tec.lan, or ubuntu-02.tec.lan from perpetrator.tec.lan or rapine.tec.lan?
I'm interested in using actuall ROUTES. I can already achieve results similair to this with either a NAT firewall, or with VPN.. but that's not what I am interested in.
From what I have found out so far, I should need something like the following:
On Gateway 1B:
Code:
And on Gateway 1A:
Code:
I have a running PDC with Samba and LDAP. But when I want to join the Domain with an XP Pro Client I just get following error message.
"A Device connected to the System is not working".
I have a network routing problem that I need to fix using a PC with ubuntu installed.
Here are the details of my problem:
- I have two networks.
- The first network is an ADSL router with subnet 192.168.1.x. I do not have access to the router nor change any of its configuration.
- The second network has a subnet 172.26.x.x and connect via a wireless access point. Some of the devices connected to the network require to have static IPs.
- I have a PC with ubuntu installed and two ethernet cards: one connected to the first network and the other connected to the access point.
- I need to share the internet connection between the two networks using ubuntu. I already tried before on windows and the sharing worked when both networks were configured to use the same subnet. Once I changed the subnet of the second network, internet sharing stopped working.
Im having a issue with routing internet traffic from my router two different subnets (vlans).
Theres my setup:-
Server:
Both eth0,1 are running dhcp (two scoopes) that works fine!
The output of route -n is:
I have ip_forwarding on aswell, but i can ping the ip on the server running that dhcp scoope ie ping 192.168.4.1 works great but i just cant get the internet on the clients.
Bear with me cos i'm just learning this stuff.
I've set up a couple of virtual networks with vmware workstation and experienced the same problem each time. I'll explain the one i'm working on now.
Machines -
Host - Slackware 13.1, VMware workstation 7.x.
VM1 - Vyatta (router).
VM2 - WinXP (client).
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BUT I can't ping the XP client from the virtual router, and from the host I can't ping the virtual router.
Why is this?? I assume i've done something wrong but I don't know what.
i have two subnets with different gateways.i am thinking of connecting them via a linux server which would enable them to communicate.but i dont know how to proceed for getting this done.how should the connection be made and what should be the configuration settings on the linux server.
View 2 Replies View RelatedI'm trying to build a linux(fedora 12) dhcpd server(and gateway), that have 3 network cards(eth0 have with public ip, eth1 192.168.2.1 class and eth3 with 192.168.3.1 class).
Because I have just a switch, I want to put both cables(from eth1, eth2) in the switch. Every client has 2 network card(eth0, eth1). My question is, is there any way to conf eth0 to take from server ip from 192.168.2.1 class, and eth1 from 192.168.3.1? The internet will work only on eth0.
my dhcpd.conf for now looks like this:
subnet 192.168.2.0 netmask 255.255.255.0 {
option subnet-mask 255.255.255.0;
option routers 192.168.2.1;
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I have some CISCO,Linux related problem with 2 Class C subnets:
192.168.64.0 -> PC5
192.168.65.0 -> PC6
Here's a picture of my situation: [URL]
HQ has to have 2 STATIC routes in order those 2 "PCs" mentioned above to have end to end connectivity with NETWORK A and NETWORK B. Now I try with
route0 -> network: 0.0.0.0, mask: 0.0.0.0, nexthop: Serial 0/0/0
route1 -> network: 0.0.0.0, mask: 0.0.0.0, nexthop: Serial 0/0/1
And it seems to work but I don't think it's proper! I feel it's kinda wrong ... but all my other attempts to set another couple of static routes ends in "Request timed out" and thus connection lost.
I want to do a simple port redirect, i.e. whatever comes trough whatever interface on port AAAA will get redirected to port BBBBI thought that iptables -t nat -I PREROUTING --source 0/0 --destination 0/0 -p tcp --dport AAAA -j REDIRECT --to-ports BBBBhowever it doesn't work, e.g. nc -v -w2 -z localhost AAAA gives:
nc: connect to localhost port AAAA (tcp) failed: Connection refused
while
nc -v -w2 -z localhost BBBB
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I have a Ubuntu server with multiple NICs and I'm just thinking about a potential scenario that might come up soon.
Imagine I have a network on floor 1 with an independent cable connection to my Ubuntu server -> switch -> assorted devices, on the subnet 192.168.0.x Now imagine friends upstairs have another independent network with cable -> router -> assorted devices, on subnet 192.168.1.x.
How can I set up my server to provide access for the 1.x subnet to the 0.x and vice versa. Ideally the devices all access internet from their appropriate subnet. I've read something about bridging, is this what I need?
I have one main subnet 192.168.50.0/24 with a defaultrouter 192.168.50.1 connected to the internet. I have an NFS server on that network. Everything is working as desired and machines are able to see each other and access the internet.
Now, I would like to add two more interfaces to the NFS server (running Slackware Linux), each on its own different subnet, say 192.168.51.0/24 and 192.168.52.0/24. The clients on those new subnets should also be able to access the internet (through the router 192.168.50.1). how to setup routing? Do I need any additional hardware router in between, or just a software configuration on the NFS server?
On a side note I have VLAN capable switches (couple of ProCurve 1800-24G) and would like to separate the three subnets using VLANs instead of using three separate switches.
In configuring static routing between two different subnets.
I have two different subnets as mentioned below:
I have a linux machine with two NICs on which i would like to configure static routing. details of the NICs are as mentioned below:
I have configured the gateway as 10.77.77.1 on machines which fall under 10.77.77.0/24 subnet and 172.16.40.1 on 172.16.40.0/24 machines.
My main motive here is i want communication to happen between both the subnets.
If the following modifications to route-eth0 and route-eth1.
I am trying to remember how to determine the number of subnets there are in a given subnet range. The example range is shown below:Quote:217.133.64.0-217.133.127.255nce I did the binary conversions of the two addresses shown, the address that I got when comparing the two was the following:Quote:217.133.192.0he number of subnets I got from his was 63.Correct me if I am wrong, but is the number of subnets the difference between the number, in this case, the third octet and 255? If there is another, or correct, way of determining the number subnets what would it entail?
View 8 Replies View RelatedI have a Ubuntu 10.10 box which i've developed an IPTables Firewall script and is forwarding my ports correctly. This service also runs Openswan VPN Server with 2 VPN's, which is also working well.
I have come across a small snag with excluding the multiple VPN subnets I have from the NAT on this box.
I have the line in my configuration file:
-A POSTROUTING -o eth1 -s 10.172.1.0/24 -d ! 192.168.5.0/24 -j MASQUERADE
Which when added to IPTables does make the VPN come to life. But I can't seem to get it to add the second subnet. Unfortunately, I can't do a blanket exclusion such as 192.168.0.0/16 because the second VPN is on a Class B subnet address which I cannot change.
I would like to be able to ssh to a TCP port on my server and be directly connected to the serial port @ 115200 Null modem config. Does any body know how one can do this?
View 4 Replies View RelatedWe have a need to shape outgoing traffic EXCEPT to certain IP/subnets (sounds opposite to the title, but not really :P), using iptables if possible. We've had decent luck doing it with various things, but one of the big problems is the decrease in download speed (which DOES NOT need to be shaped at all) due to upload shaping. ie, we want the shaping not to apply to TCP/UDP overhead. Semi related but probably not important is the ability to shape virtualised systems as well (ie the guests), but as the guest traffic goes through the host any traffic shaping done on/to the host should affect the guests as well.
View 1 Replies View RelatedI am find myself in need of building what amounts to 3 ip networks on 1 physical lan.
first LAN is another companies network on the 10.0.0.0 network a mix of pc's and equipment
second is LAN new company network 192.168.168.0/24
third network is an ip phone system for both i would like to use 192.168.200.0/24
i am hoping to use the same dhcp server to do this, assigning address to the old company's 10. network via mac address reservation.
I have set up OpenVPN server using a bridged configuration. My networking "powers" aren't that advanced, so I did this by following the openvpn tutorial for bridged servers. I have tested this with several clients connecting to my server from different locations and it works very nicely (including broadcasts).
My server's LAN IP address is 192.168.2.4, and my LAN's mask is 24. Clients connecting to my server get assigned IP address that also fall within that subnet (i.e., the 192.168.2.x pool contains both physical machines in my home and "virtual" hosts). This is what the OpenVPN walkthrough specifies:
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I was wondering if it would be possible for the VPN to fall within a different subnet (such as 10.0.1.x). I would also like to do that without adding another physical NIC to my server, or changing my physical IP address. I would imagine this is possible, since that's how hamachi does it.
i am using centos 5.2 . recently i have implementing transparent proxy but i faced issue. i received lots of messages in dmesg. i have 2 machine with same OS another machine are works fine with this same configuration
br0: received tcn bpdu on port 1(eth0)
br0: topology change detected, propagating
br0: received tcn bpdu on port 1(eth0)
br0: topology change detected, propagating
br0: received tcn bpdu on port 1(eth0)
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Would like to seek your support and idea about the having 2 IP addresses bind to my server.I am using a Dell Server coming with 2 Gigabit Ethernet ports -- eth0 and eth1.After CentOS 5.4 installation, if we assign 2 IP addresses 192.168.1.1 and 192.168.1.2(both in the same subnet - 255.255.255.0) to the 2 NIC. The default gateway is 192.168.1.254.We found the following phenomenon:1. If we unplug the cable connecting eth0, eth1 will be disconnected as well.2. The connection to the server, like SSH, FTP, experience frequently disconnection.My questions:1. If we want to connect both cables to the 2 ports, how can we make them independent and actas normal? That means both ports are functioning independently.2. Is the any build in function in CentOS that can bind 2 NIC as 1?
View 2 Replies View RelatedI have a CentOS5 box I use to run ASSP for Anti-spam. It has a single NIC. I configure network settings using Webmin. I have two Internet connections managed by different routers.
Router 1 - 10.0.0.254 255.255.255.0
Router 2 - 10.0.0.250 255.255.255.0
CentOS - 10.0.0.30 255.255.255.0
Both routers port forward traffic on port 25 (SMTP) to the CentOS box. The SMTP connections only work for the router that is the default gateway on the CentOS box! If Router 1 is configured as the default gateway in CentOS then I can Telnet to that routers WAN IP on port 25 and successfully send mail! On Router 2 I get no connection unless I change the default gateway in CentOS to be the IP of Router 2 thern Router 1 SMTP connections will not work! I imagine that CentOS is sending out it's responses to the default gateway instead of the Router that initiated the port forward?
