Networking :: HughesNet Is DHCP - My LAN Is Fixed-IP - Don't Want To Change That

Feb 3, 2011

For some time, I've had DSL and used Fixed-IP internally. I moved, no DSL, no cable, no nuthin' but dial-up and flaky cell-phone modem. Ugh. Along comes American Recovery and Reinvestment Act providing funding for making high-speed internet available to those of us in the boonies; no up-front or monthly equipment costs, affordable monthly changes, whoo-boy, that's for me. Installed, works, bada-boom, bada bing.

I have three servers, a network printer and a large format pen plotter that have all happily played together with fixed-IP for years connected via a Linksys BEFSR41 router and CAT-5 or CAT-6 cables and I do not want to screw around with DHCP (and the printer and plotter don't particularly like DHCP in any event). The servers talk to each other with SSH, their names and addresses are in /etc/host and all has been well with the world. DSL connected with PPPoE, HughesNet connects "automatically" to the modem with DHCP. I also have a switch available for additional LAN stuff as needed. Of course I had to do a hard reset of the router when setting up HugheNet (right back to infancy).

I do need to have DHCP enabled in the router for the limited occasions that a Winders thing gets connected to it (not my box, I don't mess with it).

Now, the actual question: is there any setting in the router that will enable fixed-IP, ignore DHCP leases unless the server is running DHCP (like a Winders box) and not bother me with screwy lease addresses that override my fixed-IP addresses? My servers are running Slackware 13.1, all configured with fixed-IP, all configured to "know" each other via /etc/hosts, /etc/resolv.conf has DNS Server address in it (and DHCP is not permitted to overwrite /etc/resolv.conf.

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CentOS 5 Networking :: How To Switch From DHCP To Fixed IP

Jan 25, 2009

Assume I installed originally CentOS Desktop with IP receiving from DHCP server.Later I decided to assign a fixed IP to the local CentOS installation.How do I switch (permanently) the dynamic DHCP IP assignment to a fixed IP?

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Fedora Networking :: Commands To Switch From DHCP To Fixed IP Address?

Feb 20, 2009

When I install Fedora 10 on a new system, I let it default to DHCP. Later, I change the system to a fixed IP address by running system-config-network, selecting eth0, clicking on "Edit", clicking on "Statically set IP addresses:" and filling in the blanks. Is it possible to accomplish the same thing using commands that could be entered in a script? I assume one of them would be

Code:
ifconfig eth0 address XXX.XXX.XXX.XXX netmask 255.255.255.0

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Networking :: Eth0 Fixed IP - Eth1 DHCP Gateway - Access To Eth0?

Aug 19, 2009

5.10 Breezy configured as machine controller. Works great eth0 is a fixed IP to communicate with controller comms board. Not easy at all to alter - the comms board is hard coded to listen on eth0 for commands.

I can use eth1 as the default gateway and ping google.com, etc. But when I now attempt to communicate with the controller with netcat, e.g.

Code: echo !HH | nc 192.168.1.6 80

I obviously never get an answer since the request is passed via eth1. Using the -g option with netcat doesn't work either. I had a look at iptables but it doesn't seem to be able to do what I want. How I can still use eth0 as my communication port to the controller whilst eth1 is the default gateway?

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Networking :: New Install Of Centos 5.5 Will Not Work On Net Work With Fixed IP Or DHCP

Jan 12, 2011

I am trying to set up an unused machine as a web server for my students.

I originaly tried with Redhat 9 and had the same problems. I am using an HP Pentium 4 system with 2 network cards.

1) The built in Realtek RTL8139 configured as eth0.

2) An add in Broadcom BCM5782 Gigabit card that was added I presume when the built in card failed (we have a number of machines like this around the school), configured as eth1.

I did not realize the second card was installed when I had Red hat 9 on the system, but I discovered it after installing centos 5.5. I have tried to configure the system to use DHCP with and without getting the DNS from the provider, and both ways the system complains that there is no connection, check the cable, so it will not activate the device.

When I configure the device to use a fixed IP, I can configure the device, but I can't ping anything on the network other than myself. I suppose it is possible that both network cards have failed, but I get green link lights with both cards, when I connect them to my router, so I am at a loss as to why neither board seems to work. I don't have a spare network card to slide in because the computer takes a special mini card. Is there an easy way to test the board to see if the board is a problem?

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Slackware :: Dhcp Fixed Address Not Working

Jun 7, 2010

I have a slackware server running ISC dhcpd and bind, and I want to give a dual boot XP / Ubuntu client a fixed address based on its MAC.

I added a host stanza to my server's dhcpd.conf:

Code:

I restarted bind and dhcpd, restarted the client's networking, and it still requests (and receives) its previously leased address, which is not the fixed address I want it to get. I tried dhclient -r to make the client release the old address, didn't help. On networking restart it still gets offered the old (wrong) address. Could it be that dhcpd somehow hangs on to the old lease even after the client sent a DHCPRELEASE?

How do I tell dhcpd to forget about an old lease, and how do I make dhcpd hand out the fixed address (and only that address) I specified for a given MAC, regardless of what the client requests?

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Server :: DHCP Doesn't Provide Fixed Addresses

Apr 9, 2010

Ubuntu LTS 8.04 + DHCP. Works fine except for fixed addresses. I mean all devices which need to get fixed IP according to their MACs don't get them and keep to receive random IPs from the range (although almost everytime all machines receive the same IP they got from DHCP for the first time).

The following config was created by Webmin interface.

At the one of the ubuntu forums i was advised to carry host description out of the subnet description.

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Ubuntu Servers :: Dhcp Doesn't Provide Fixed Address

Apr 8, 2010

Ubuntu LTS 8.04 + DHCP. Works fine except for fixed addresses. I mean all devices which need to get fixed IP according to their MACs don't get them and keep to receive random IPs from the range (almost everytime all machines receive the same IP they got from DHCP for the first time).

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Networking :: Can't Change From Dhcp To Static Ip Address

Jan 16, 2010

Can't change from dhcp to static ip address.I've installed Oracle's version of Linux Redhat 5, but I'm having no success changing from dhcp to a static IP address. My machine is plugged directly into a Belkin router which has the IP address: 192.168.2.1.If I use the gui: /usr/bin/system-config-network and set the network device to dhcp,it works fine. But if I set the IP address manually, I get no internet traffic, and if I ping an internet website, "network unreachable".The installation instructions for Oracle say that they want a full domainname. I've tried gateway.2wire.net. This worked in the last place I did a successful installation.It was the address of my ATT router. If I plunked that into a browser, I got the router configuration.

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Ubuntu Networking :: Change From DHCP To Static IP Address?

Nov 14, 2010

Does anyone know an easy way to do this? I can't seem to figure it out.

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Ubuntu Networking :: Change The Default Dhcp Client

Jun 1, 2011

I want to use dhcpcd instead of dhclient on Ubuntu. The 'interfaces' man page say: "The dhcp Method This method may be used to obtain an address via DHCP with any of the tools: dhclient, pump, udhcpc, dhcpcd. (They have been listed in their order of precedence.)"

I can't find where to change this default order. I can uninstall dhcp3-client, but this will also remove ubuntu-minimal, which is not a good solution.

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Networking :: Change Debian Default Dhcp Client?

Nov 5, 2010

I would like to use dhcpcd instead of dhclient in my Debian installation, because I had some trouble with dhclient in the past and I assume the problem is still exists now with some equipments.

So I would like to use dhcpcd, but I couldn't find a way to tell the system to give higher priority to dhcpcd than dhclient.

Also, I've tried to remove the package 'isc-dhcp-client', but it also would like to remove the following packages: isc-dhcp-client knm-runtime network-manager network-manager-kde

Moreover, it says no need the following packages anymore: usb-modeswitch dnsmasq-base libnm-util1 usb-modeswitch-data network-manager-ppp pptp-linux network-manager-openvpn libnm-glib-vpn1 libnm-glib2 modemmanager vpnc network-manager-vpnc

I would like to still be able to use kde-network-manager, because it is much easier to manage wifi connections using this interface.

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Networking :: Notification From DHCP Client On Lease Change?

Jan 26, 2011

Is there any way to get an async notification (perhaps through something like a Linux message queue or Unix socket) when a DHCP client is either unable to renew its lease, or the address obtained changes from the previous value? I've got the ISC client and will dig into it to determine if it supports such a feature, but thought I'd ask here in parallel. (I'm trying to find out if there are any DHCP clients out there which already support this capability.)

If you're curious: We have an application where we're doing auto-registration of an IP camera to an external server. If the camera's dynamically assigned address changes, we need to restart the auto-reg state machine. I've seen implementations where a socket is opened and a SIOCGIFADDR ioctl used to fetch the IP addr, but I'd sure like to avoid polling like this if possible.

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Ubuntu Networking :: No DHCP Offers Received After Modem Change?

Jul 5, 2011

I used to connect to the internet via a Linksys router using the following terminal commands (Network Manager has never worked for me on any Ubuntu install):

Code:

sudo ifconfig wlan0 down
sudo dhclient -r wlan0
sudo ifconfig wlan0 up

[code]....

However, I recently changed the old modem + router for a new wireless modem (a Thomson TG585v8 ). Now, the result of that last command is this:

Code:

amosupremo@amosupremo:~$ sudo dhclient wlan0
Internet Systems Consortium DHCP Client V3.1.3

[code]....

No working leases in persistent database-sleeping. I've tried to connect in Natty(both Ubuntu and Kubuntu) and it's not working either.I also purged Network Manager and installed wicd and I managed to get an intermittent, slow connection.

1 ) Machine Brand and Model (PC/Laptop): No brand. I built it with the following specs:

AMD Athlon II X4 2.6GHz
2 HD: 100GB Sata (Ubuntu and XP64 install) / 80GB IDE (XP)
4GB RAM
Gigabyte Motherboard

2 ) Wireless Brand, Model and Wireless Chipset:

Code:

amosupremo@amosupremo:~$ lsusb
Bus 002 Device 005: ID 0ace:1201 ZyDAS 802.11b
Bus 002 Device 004: ID 049f:000e Compaq Computer Corp. Internet Keyboard

[code]....

3 ) check interface:

Code:

amosupremo@amosupremo:~$ ifconfig wlan0
wlan0 Link encap:Ethernet HWaddr 00:02:72:04:d0:04

[code]...

I am also attaching the wicd log. It contains a session where I got the intermittent connection. I stopped that connection and restarted it (with the same results) two times.

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Networking :: Change MAC Address & Connect To A Dhcp Server Successfully

Dec 26, 2009

For changing the the mac address of my lan card( eth0) in linux fedora 9(solphur) i used this command

And i could change my mac address successfully but now i couldn't connect to my network via a dhcp server ( in configuration section of my router im going to check my new mac address (because i want to spoof) ,how i can do that?

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Server :: Fixed Address In Dhcp Server

Jul 8, 2010

I want to set up a dhcp server such that the clients get same ip every time. Giving fixed address to every client would be a long process.

"I don't want to assign a specific ip to the client but what i want is the server provides same ip every time"

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Ubuntu Networking :: DHCP Server No Longer Responses To DHCP Requests - Can't Ping Gateway

Oct 22, 2010

Back in April I set up a Ubuntu DHCP server and a multiple VLAN network [URL] to migrate our various servers, workstations, etc off the 192.168.1.1 /24 network that everything was on because we where running out of address space. I built out the new network and everything worked great except our AD server would never get an IP address from the DHCP server (static reservation) and even if I set the IP statically on the AD server it couldn't ping the gateway and noone could log in. After several attempts to resolve this, including bringing in outside help, we where never able to figure out what the problem was.

Now 6 months later I have time to revisit the issue without effecting the live network. I used Acronis and imaged the AD server last Friday, cloned it on to another box with the same hardware, and put it up on the new network that's been sitting unused for the last 6 months. Today when I statically set the IP on the AD server (which is what I want) it connects and I can ping it's gateway 192.168.1.1 and all the way across vlans to a test sales agent workstation at 192.168.8.xxx on vlan 800 but only if I statically assign the agents station an IP address. When I try to get an IP address via DHCP it fails as destination unreachable. Nothing has changed in the last 6 months on the DHCP server but now it for some reason can't ping its default gateway 192.168.1.1. All of the config files are the same as they where left from the post linked above aside from the vlan id's used where changed from 1's to 100's (i.e. vlan 3 is now vlan 300) /etc/network/interfaces

Code:

auto lo
iface lo inet loopback
auto vlan100
iface vlan100 inet static

[code]....

why it can't reach the gateway, when I do a tcpdump I can see the DHCP requests come in on eth0 but the server never responds and I'm pretty sure its because it isn't "seeing" them since it thinks there isn't a network connection but I don't know how to trouble shoot to find out where the problem lies.

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Ubuntu Networking :: DHCP Server No Longer Responds To DHCP Requests - Can't Ping Gateway

Jul 1, 2010

Back in April I set up a Ubuntu DHCP server and a multiple VLAN network [URL] to migrate our various servers, workstations, etc off the 192.168.1.1 /24 network that everything was on because we where running out of address space. I built out the new network and everything worked great except our AD server would never get an IP address from the DHCP server (static reservation) and even if I set the IP statically on the AD server it couldn't ping the gateway and noone could log in. After several attempts to resolve this, including bringing in outside help, we where never able to figure out what the problem was.

Now 6 months later I have time to revisit the issue without effecting the live network. I used Acronis and imaged the AD server last Friday, cloned it on to another box with the same hardware, and put it up on the new network that's been sitting unused for the last 6 months. Today when I statically set the IP on the AD server (which is what I want) it connects and I can ping it's gateway 192.168.1.1 and all the way across vlans to a test sales agent workstation at 192.168.8.xxx on vlan 800 but only if I statically assign the agents station an IP address.

When I try to get an IP address via DHCP it fails as destination unreachable. Nothing has changed in the last 6 months on the DHCP server but now it for some reason can't ping its default gateway 192.168.1.1. All of the config files are the same as they where left from the post linked above aside from the vlan id's used where changed from 1's to 100's (i.e. vlan 3 is now vlan 300) /etc/network/interfaces

Code:

auto lo
iface lo inet loopback
auto vlan100

[code]....

why it can't reach the gateway, when I do a tcpdump I can see the DHCP requests come in on eth0 but the server never responds and I'm pretty sure its because it isn't "seeing" them since it thinks there isn't a network connection but I don't know how to trouble shoot to find out where the problem lies.

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Networking :: Configure A (openSUSE) Client To Dhcp To EBox DHCP Server - Lease An IP Address

Mar 25, 2010

I am puzzled with trying to configure a linux (openSUSE) client to dhcp to eBox DHCP server. I am using dhclient to lease an IP address with dhclient eth0 -s 10.45.48.108 and get a response

openSUSE11232CL1 dhclient: DHCPDISCOVER on eth0 to 10.45.48.108 port 67 interval 4
openSUSE11232CL1 dhclient: DHCPOFFER from 10.45.48.108
openSUSE11232CL1 dhclient: DHCPREQUEST on eth0 to 10.45.48.108 port 67
openSUSE11232CL1 dhclient: send_packet: Network is unreachable
openSUSE11232CL1 dhclient: send_packet: please consult README file regarding broadcast address.

The server reports eBox141 dhcpd: DHCPDISCOVER from 00:0c:29:3e:57:a3 (openSUSE11232CL1.domain.net) via eth0
eBox141 dhcpd: DHCPOFFER on 10.45.200.2 to 00:0c:29:3e:57:a3 (openSUSE11232CL1.domain.net) via eth0

I interpret this as the server receives the request and the client accepting it but the lease does not last long and the connection breaks. what this could be and why the connection breaks? Or my undestanding is totally wrong on how it works and should work? And BTW, where is that README file that's referenced in the message I receive on the client?

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Ubuntu Networking :: If DHCP Not Available - Fallback And Start DHCP Server?

Mar 8, 2010

Currently I have my eth0 interface getting a DHCP address but at times the DHCP server will not be reachable. Sooo what I would like my server to do is if it cannot find a DHCP server assign a static address to eth0. Then start the DHCP service so it can then dish out some addresses.How can I do this? Surely it is possible

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Networking :: Apache Allow Fixed Ip Addresses

May 23, 2011

I would like have a password for accessing my web site which works fine. I also want for the specific site to allow access only for a specific range of ips. Right now the following config should forbid my access, as my ip is different from 200.200.200.*

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Ubuntu Networking :: Configuring IPv4 With Fixed Ip?

Aug 2, 2010

Our router is pretty old and only capable of giving fixed ip and there is no support for IPv6. Via the gnome networkmanager I try to set a manual IP to 192.168.1.123 and a netmask to 255.255.255.0 and a default gw at 192.168.1.1 . However, this does not work.

If I open a terminal and type:

Code:
sudo ifconfig eth0 inet 192.168.1.123
sudo route add default gw 192.168.1.1
Then I get a perfectly valid connection to the internet.
ifconfig by it self returns:

[Code]....

ffor me it seems that the gnome network manager doesn't save the information that I gently ask it to.

I can fix it with the CLI commands, but I would like to know whats going on.

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Ubuntu Networking :: 9.10 Server - Fixed IP Eth0 Disappeared

Mar 9, 2010

Ubuntu server 9.10. I have configured my network connection using GUI Network connection. It worked fine with DHCP, but when I assigned a fixed IP eth0 has disappeared. How can I restore it?

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Ubuntu Networking :: Using Aircrack-ng [fixed Channel Mon1?

Feb 2, 2011

I am trying to audit my wireless router due to someone in the neighbourhood hacking it, and have run into a few problems. When I run airodump-ng, everything works fine. However, when I try to get the .csv file and run "airodump-ng -w test --channel 6 --bssid ---------- mon1" (obviously with my the mac address of my AP instead of x's) I get this:

CH 6 ][ Elapsed: 4 s ][ 2011-02-02 17:48 ][ fixed channel mon1: -1 ] The problem is the [ fixed channel mon1: -1 ], because when I go to the next step to try to force a handshake, it says:

18:00:34 Waiting for beacon frame (BSSID:-----------) on channel -1
18:00:34 mon1 is on channel -1, but the AP uses channel 6

I have scoured the Internet for answers, and have seen several people with the same problem, but no solutions that work for me. I think it may have something to do with the driver. I really do apologise if this has been answered properly several times, but none of the solutions seem to be working in my case.

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Networking :: NFS Booted Client Lockd Ports Not Fixed

Mar 18, 2010

I boot some Slackware with PXE. All work fine except i can't fix the client lockd ports.NFS is compiled inside the kernel, so all modprobe.d options are useless.But rpcinfo -p on the client side shows me totally different ports.On the NFS server, the ports are ok, as i appended lines in /etc/lilo.conf Server and client kernels/modules are identical.

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Ubuntu :: Change From Dhcp To Static Ip Addy?

Jan 5, 2011

my system is belkin router with dhcp enabled.connected are: win xp desktop, win7 netbook, ps3 and fujtisu laptop with ubuntu 10.10, advent notebook xp. right now i have everything getting its ip addy over dhcp but i want to set static ip for each machine. (so the ps3 can run dmz and ocasionally the belkin changes ip address even tho the lease time is set to forever) i can do this with the windoze machines but i do not know how to set static ip and other info for the ubuntu machine.i did search for the forum for 'static ip' but the results that appeared were nothing to do with dhcp!

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Ubuntu Networking :: How I Fixed Asus USB-N13 Compile Errors In Ubuntu 10.10

Oct 21, 2010

It seems with the newer linux headers, two functions changed their names slightly and caused a crash when attempting to build the Asus-provided USB-N13 drivers.

I'm still in the middle of getting the device to work, but actually compiling the driver was a major problem for me and others I've seen that complained of the breakage in 10.10.

Here's the fix:
Within the include/os/rt_linux.h and os/linux/rt_usb_util.c files, the usb_buffer_alloc and usb_buffer_free functions are part of an internal macro. These functions do not exist anymore and are replaced by the usb_alloc_coherent and usb_free_coherent respectively. Input parameters did not change, just the names.

The macro is defined in rt_linux.h and the functions are used in a symbol export within rt_usb_util.c. Simply renaming the functions should allow it to build.

As I said, I'm still in the process of getting the wireless to work, just wanted to let everyone know of the quick fix.

This issue will probably be addressed with a macro fix somewhere eventually.


#define usb_alloc_coherent(a, b, c, d) usb_buffer_alloc(a, b, c, d)
#define usb_free_coherent(a, b, c, d) usb_buffer_free(a, b, c, d)

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Networking :: Dynamic IP Address With PTR Record Versus Fixed IP Address Without?

May 7, 2010

I am running my own Postfix mail server. Some time ago I noticed that most email was rejected because of the server's dynamic IP address. So I got a fixed IP address. However then I noticed that some mails got rejected due to failing the reverse DNS check. So my ISP told me to get a range of IP addresses and they could then create a PTR record for one of those addresses. That is now running but it turns out that the IP address used for the PTR record is a ... dynamic IP address. So Spamhaus PBL rejects my emails again.

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OpenSUSE Install :: PXE / Dhcp / 11.2 - Preserve Dhcp Lease On Reinit Of Driver?

Feb 8, 2010

first: PXE flawless bind to dhcp address but put next binding state to free second: when installer calls init script to reinit ethernet driver (e1000 (vmware)) binding fails 11.2 opensuse fail to reinit dhcp with log entry "no free leases" third: when manual set network install works how to preserve dhcp lease on reinit of driver?

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Fedora Networking :: Networking And Static IP Adresses In Presence Of DHCP

Aug 22, 2010

I want to run networking on my laptops in different environment (home, office, airport etc). I found that Netowrk Manager assigns information from DHCP although I requested fixed IP and configured the gateway and DNS. If I reconfigure the DHCP server so that there is no free IP address, the laptop refuses to connect. When I remove the interfaces from the network manager, I get the fixed IP address, /etc/resolv.conf is not overwritten from DHCP but WiFi connection cannot be established, there is no dialog for setting WPA-PSK. The static IP address seems to be taken into account only if the DHCP server is not found. I need the static address at home and in my office because I need the possibility to ssh to my laptop from another computer but I need IP from DHCP possibly authenticating against RADIUS (Eduroam) when travelling somewhere else. Is there an easy way how to achieve it and how to switch profiles easily? And I cannot switch DHCP off because some devices in my LAN cannot work without it.

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