Networking :: Ethernet Port Connection With An E1/T1 Port
Aug 30, 2010
i have an embbeded hardware that uses bootp for booting from a Network Managemnt Host (NMH)on the same ethernet. The embedded hardware has both kind of ports i.e ethernet as well as E1/T1. I would like ask, what do i require to establish a communication-link between the embedded hardware and the NMH throuh E1/T1 ports of embedded hardware, so as to make it boot through from E1/T1. Further, NMH possesses only ethernet port. Just to refine my questions i'd like to know what additions do i need to do on my NMH , like may be i have to put an E1/T1 port or is it possible that the E1/T1 port can be directly connected to an ethernet port on the other host.
pardon me if i am not making absolute sense here as my knowledge is limited on Layer 1 and layer 2.
while my brother was browsing the web on my windows partition he had a blue screen pop up, one of the soft/hardware error ones, not a true BSOD, anyways, ever since my lan port on the computer seems to not be activiating as no wired connection is recognized. The lan port/card is directly attached to the Mother Board, it's a gigabyte motherboard in a self-build computer. I'm just wondering if there's anything I can do to troubleshoot this and see if it is truly a hardware problem or if its something else.
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
I created a wireless ad hoc network using network manager. That was simple. I have friend who doesn't have a wireless card, and still would like to join the LAN. It would be nice if he could have a different IP address Is this possible?
I have got a laptop running Debian squeeze. I wish to share the wireless connection of the laptop (wlan0) to the ethernet port of the laptop, so that I can share the wireless connection to my desktop PC which is connected to the ethernet port.
I have read the article on Ubuntu community: [url]
I followed the steps, and the /etc/network/interfaces file on my laptop is:
Now the situation is: My laptop can connect to Internet (i.e. ping debian.org from laptop is fine), my desktop PC can connect to my laptop (i.e. ping 192.168.1.1 from desktop PC is fine). However, the desktop PC cannot reach the Internet.
I also read the information on Debian Wiki: [url]
It seems I must install and configure ebtables before sharing my wireless connection to ethernet port. Is it true? (But why the article on Ubuntu community doesn't mention it?) Or I just made some mistakes?
i am running ncat (netcat's new version from nmap) on centos . I am listening on different ports. My question is , is it possible that when a connection is received on a port say 123, i redirect this connection to a different port and use the 123 port again for listening connections. ncat has an option -k which u can add with -l , it will force fully listen on the port. It can accept multiple connections on a single port but i want that once a client connects on to 123 port, he is forwarded to some other port and no longer on 123.
I can't figure this out for the life of me. I am new to Linux too. Wireless works fine. I plug my Ethernet in and turn off wireless and I cant surf the web, download, etc...Network Manager finds the wired network under eth0 and it works perfect on my non-linux desktop (nervous to even mention Vista around here). Firewall was set up with basic setup (I didn't make any changes). I have a Sony vaio VPCCW21FX with fedora 13. Can anyone point me in the right direction?
I am running 11.04 on a Dell Inspiron 1501 (the first gen.). I was using my Ethernet port to connect to the internet until about two weeks ago - suddenly the system no longer recognised that port even existed and just kicked me offline. I am able to get online now with a wireless card (replaced the broadcom card, that was a whole different can of worms...).
why my system is unable to connect with the Ethernet port? If I plug in the cable nothing happens.
I have a Dell Studio 1501 Laptop and I want to bridge the wireless with the ethernet port so I can hook my xbox360 to my laptop.
I've spent the last 2 hours trying different techniques but nothing is working.
I'm running Ubuntu 9.10 so the last thing I tried was going into the network manager, clicking on wired, editing the ethernet port and allowing it to share. This did nothing.
I tried to share the connect with firestarter but that did not work either.
I am using ubuntu 9 but unable to connect to internet via my usb Siemens c110 modem. I have a dual boot system of both windows7 and ubuntu9. I am using the same modem in windows7 and have installed virtualbox where i have installed the same ubuntu9 but there it automatically detects the wired connection(usb)[eth0] but in the actual boot it doesnt detect anything. I have typed in the terminal sudo ppconfig but it was unable to find anything.
I am running Ubuntu 11.04 and i am curious to if there is a way to share my established wireless connection through my Ethernet port.. I know it was possible in Windows by going to adapters and bridging the wireless, and Ethernet adapters. how to make this work in Ubuntu?
I have a simple server running Ubuntu Server. Usually the server connects to the network by Wifi, so there is usually no cable connected to the Ethernet port. I noticed that there is a dhclient3 running on eth0 anyway. It is causing undesirable disk activity. Obviously, it is never going to get a response as long as no cable is connected. I can kill the responsible process manually, but I wonder first what is starting the process and how I can prevent it from being started. If there is a way to get the server to boot without starting this process, I wonder whether this is the right solution. Connecting to the network by Ethernet is the failsafe when Wifi doesn't work. I guess what I would like to see would be a way for the server to detect when eth0 does not have a cable connected and not start dhclient in that case, but to activate dhclient when a cable is connected.
I have a server in a colocation environment where I'm allotted 25Mbps. I'd like to avoid exceeding that for obvious reasons. Is there a way I can set the link speed or at least throttle the bandwidth for all services?
I changed to a 4 port ethernet router (D-Link DSL-2542B Adsl2+)with intention to share Internet access with my brother (he's on Vista).Initially it all went well,but 3 days ago there were connection problems occured on the part of the ISP. Without realized the problem,I had reset the router.This morning I've been informed by the ISP that the connection has been re-established.So,I accessed the Internet via the 4 port router but failed to do so (server not found).Suspecting that the problem was from the 4 port router,I reverted to my old Adsl router (DSL-520B single port) and without any problem I managed to access the Internet back.I really need help to configure back the 4 port ethernet router to its initial state.
I'm running an ubuntu maverick server, and I'm having a slight problem with networking. I've only got one ethernet line running into my room, and I've got loads of computers. The server has 2 ethernet ports, one integrated into the motherboard, one on a PCI card that I took from my old server. The on board ethernet never worked on my old server- but I only tried it out post-install, it was hooked up to the card during install (For the record, networking on linux has *never* worked for me if I installed then plugged in the networking stuff after the fact). So I just used the card instead. Transferred the hard drive into a new machine, and lo and behold, it would only work after I transferred in the card from the old one. What I wanted to set up is a basic NAT system, where the network connection is routed through from my server to my main desktop- but when I run ifconfig, my card is not detected, just lo and eth0. How can I fix this?
I am using Ubuntu 10.04 Lucid and VMware 2.0 server. I have a an XP virtual machine that is needed for work. When I am at home and I place my cat 5 cable to my cisco catalyst switch, my XP VM recognizes the ethernet card on my laptop and bridges fine with ubuntu and works fine and I can get to my network. When I take my laptop to work and I go to a site and I plug it into a World Wide Packet 311 management port on the switch, my XP Virtual Machine does not see the network no matter what setting I set it too(100 full, 10 full, 10 half and etc). It simply says that the network card is disconnect. Ubuntu see the network fine and I can ping and talk to the network without any issues but the VM does not.
I'm currently using Ubuntu 9.1, and a motherboard which has two Ethernet ports on it.
What I would like to do is bridge these ports, so I can plug in another Ethernet cable and run it to an unmanaged switch in my room (handy for my work laptop when on-call and building other PCs, etc).
I.e. Router --> 8-Port Switch --> My PC. Eth 0 --> 192.168.1.100 static Eth 1 --> 5-Port Switch --> DHCP
I believe this is the config to make the ports bridged:
I have a Dell WLAN 1397 Half Minicard, 802.11 b/g card in my laptop, and I can't seem to get ubuntu to work with it. I tried this method:
1. Synaptic Pack Manager 2. Check "Install from Boot Disc" 3. Reload 4. Install and apply bcmwl-kernel-source 5. Reboot
This didn't work for me, so I tried entering sudo apt-get install bcmwl-kernel-source and that also didn't work. Another thing I tried is formatting my Ubuntu partition and reinstalling, and retrying both of those methods. The ethernet port does work, however.
I recently installed a new CPU and motherboard in my Media Server, but the ethernet port isn't showing up under ifconfig. Is there any way to install additional drivers? EDIT: The model is Realtek RTL8111/8160B.
I have a mail server i need it to send message via port 587 not port 25, i make some changes to my postfix server which i use and it is already successed making a telnet to 587 port like it :
everything works fine. I can log in, and local port forwarding is done. Otherwise when I use the command:
ssh user@ssh_server -R 5500:localhost:5500 -p 22
I get an error "remote port forwarding failed for listen port 5500". However when I try remote port forwarding in WinXP by use of putty there is no problem...
I'm using a Debian servers, as router/firwall.. I've two ethernet interfaces into the server, one for wan and one for lan. The i use SNAT so my LAN clients can access the internet throgh the debian router. That is working... Now i want to be able to access servers on the LAN site from the WAN site, and i wanna use port address translation (PAT). I have a FTP server running on a lan server, so i'm trying to portward port 21.
When people try to access my FTP from the WAN site, they are redirected to the local FTP server, and they are promted for crendentials, but when the credentials are typed, and the local ftp server should answer the wan request, the connections dies.
The wan clients are being promted for credentials, so they are redirected to the local lan server, but after that the connections dies, so i think there is some kind of nat problem, when the local lan server is trying to respond to the wan request..
I make an application on GNU/Linux which listening on a MULTICAST stream, so I open my unconnected socket, bind it on a MULTICAST address and a port, join the multicast group with the "setsockopt (IP_ADD_MEMBERSHIP)", then I receive datagram on my socket.
Now I've two different instances of the same application that run with their own MULTICAST address and port. And what I found strange is that, after a misconfiguration, I switch the ports, for example:
Emitting on 225.0.0.1/23451 and 225.0.0.2/23452 Receiving on 225.0.0.1/23452 and 225.0.0.2/23451
And my receiving part doesn't care about the MULTICAST address, it looks like the socket is listening on the port number only! I mean that the receiver [225.0.0.1/23452] take its datagrams from emitter [225.0.0.2/23452] and vice-versa!
I have a mail server on which I would like to block port 25 on my eth0 for everyone except our external spam filter. the problem is that I want our users to be able to connect via port 10025 which is forwarded to port 25, which then is blocked...
what should I add/change to set up port forwarding of port 1000 to ip 192.168.1.200. also how to get the answer sent by 192.168.1.200 follow the same route used by the data received through port forwarding.
