CentOS 5 Networking :: Dnsmasq Dhcp - DNS Server Does Not Respond
Jan 9, 2011
I got a CentOS server setup as a dhcp server using dnsmasq. I followed this guide more or less: [URL] So, the problem seems to be concerning the DNS server on the clients. In windows I get the "limited connectivity" icon for the network, and when I select troubleshoot it says the DNS server does not respond. Issuing 'ipconfig /all' clearly shows the IP of the CentOS machine as the DNS server, which should be correct, yes?
ETH0 is working as WAN connection and that works great.. no problem with the WAN connection at all on the CentOS machine. ETH1 has the IP 192.168.0.1 and mask 255.255.255.0 When starting eth1, it sometimes says that it can't start eth1 because the IP 192.168.0.1 is already in use.. but that is most certainly not the case. Maybe there's some kind of issue here that messes with the DNS? What's mind boggling is that it works great on a linux machine (dhcp client) and on a windows xp machine. but it does not work on the windows 7 laptop and a vista laptop and a pda device.
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Jul 23, 2010
Is there anyway how to view the dhcp clients over dnsmasq?
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May 18, 2010
I've set up a very simple net with a dhcp + dns server using dnsmasq. It works but the server itself cant resolv clients names. Clients do resolv without any problem my /etc/dnsmasq.conf
[Code]...
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Mar 16, 2010
I have two dhcp server (dhcp3) in the same network, this network is a link layer network so every host is seen as directly connected. The two servers have debian lenny and there are near 13 AP mikrotik to give connection to the XO laptops (from the project one laptop per child). This is for two public schools (each one with one server) that are connected via a p2p connection and each one provides internet for the school and outdoor too. The servers are also file servers, proxy, etc.
Each time a laptop asks for an IP, it sends a broadcast message and this petition gets to both servers, now a days the first server that reply is the one the laptop associate with. What I want to do is, knowing the bandwith use of the ADSL, the clients connected to the server, and the cost to the AP that the laptop associate with, decide wich is the best server to be connected to. What I want to achive is to balance the load and to decide the optimum connection, because now it could happen that one server is very loaded and the other is free. I tried to run dhcp with inetd and use tcp wrappers to invoke a script to check a condition before responding and, in case to be the best server, reply to the laptop, but i couldn't get the dhcp server to respond when I run it with inetd. here is my inetd.conf
bootps dgram udp wait root /usr/sbin/tcpd dhcpd3
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Mar 1, 2011
I have a CentOS 5 Server running for private fun... Just for playing with it and learn a little linux.this server has to Network interface cards. one for connecting from extern and one from connecting from the LAN.when i want to connect from lan (eg via SSH) this allways works!when i want to connect not from LAN this only works sometimes! only if i establish at the same time a connection from LAN it wors mostly.with other devices i have no problem (tested another server with just 1 NIC) and this works too.also the problem is not dyndns because i have the same problem when i try to connect through the direct IP.
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Sep 2, 2011
Is dnsmasq important for dhcp to setup dns?
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Jun 11, 2010
I have been rtying for a couple of days now to set up a local dns/dhcp server with dnsmasq on a ubunut server 10.04 I followed the basic instructions from several websites, starting with the ubuntu community one, didnt work, then tried some other, and nothing.
In the server the dns works, i test with dig example.com and i can see the time difference, so dns is working. so the problem is not making the dns work but to make the server listen for dns and dhcp resquests and respond to them.
I have desactivated the dhcp from the router so thats not the problem. making a windows box ping the server works, so the network is configured correctly.
dnsmaq is listed as "LISTEN" on netstat, i read in some blog that it should be using ports 67 and 68 but those are no listed, neither i configured them in any moments, none of the instructions i followed mentioned sth about that. i even tried configuring the window box with the ips and dns accordingly and that wouldnt work either.
so in conclusin i have dnsmasq that does have dns set up but wont answer to any requests of either DNS nor DHCP.
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Feb 9, 2010
how to configure DHCP server on centos linux and how to configure FTP server on centos linux
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May 7, 2010
I have installed Centos 5 on a virtual machine (esx4i). I set it to obtain an IP address from the DHCP sever, which is a broadband router, it has been given an IP address of 10.10.11.159 the router is 10.10.11.1 but I can't ping the router and I can't get any access to the network! I have a SCO Openserver server on the same physical box and it works fine so I know the network card & cable is ok.
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Nov 2, 2009
Since latest large update to CentOS 5.3, which also upgraded to 5.4, I have problem with dnsmasq. CentOS is real server on real hardware (not virtual). I use dnsmasq as dhcp server as usual. On hardware startup or reboot, these lines are included in /var/log/messages
Nov 2 19:06:16 server avahi-daemon[2965]: New relevant interface eth0.IPv4 for mDNS.
Nov 2 19:06:16 server avahi-daemon[2965]: Joining mDNS multicast group on interface eth0.IPv4 with address 192.168.0.1.
[Code]....
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Sep 5, 2010
trying to configure a Centos 5.5 server (simple file server with DHCP and DNS relay). I configured and tested the config (by 'service dnsmasq configtest') of dnsmasq and I got the message 'dnsdomain:host unknown (translation of the real message : hte inconnu) and I didn't find where I could define this host ! The hostname of the server is well defined and I can see it from all Windows PC's on the LAN. dnsmasq starts (with hte same message as in configtest) but when querying DNS from PC's te.g. trying to surf the Internet), I don't get replies (3 DNS servers are also well defined and operational).
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Aug 6, 2009
I am attempting to get this network card running under CentOS 5.2 but have had no luck. Some sites say to use the sk98lin driver, others the skge, which I can't find at all. I have tried multiple versions of the driver in rpm but none seem to work. The card shows under the network manager but will not get an IP address from the DHCP server.
Here are the outputs for this card.
uname -rmi
2.6.18-92.1.10.el5 x86_64 x86_64
lspci -m
04:01.0 "Ethernet controller" "D-Link System Inc" "DGE-530T Gigabit Ethernet Adapter (rev 11)" -r11 "D-Link System Inc" "DGE-530T Gigabit Ethernet Adapter (rev 11)"
lspci -n | grep "$(/sbin/lspci | awk '/net/ { print $1 }')"
04:01.0 0200: 1186:4b01 (rev 11)
lspci -vv
04:01.0 Ethernet controller: D-Link System Inc DGE-530T Gigabit Ethernet Adapter (rev 11) (rev 11)
Subsystem: D-Link System Inc DGE-530T Gigabit Ethernet Adapter (rev 11)
Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV+ VGASnoop- ParErr- Stepping- SERR- FastB2B-
Status: Cap+ 66MHz+ UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR-
Latency: 64 (5750ns min, 7750ns max), Cache Line Size: 32 bytes
Interrupt: pin A routed to IRQ 121
Region 0: Memory at febfc000 (32-bit, non-prefetchable) [size=16K]
Region 1: I/O ports at e800 [size=256]
Expansion ROM at e0000000 [disabled] [size=128K]
Capabilities: [48] Power Management version 2
Flags: PMEClk- DSI- D1+ D2+ AuxCurrent=0mA PME(D0+,D1+,D2+,D3hot+,D3cold+)
Status: D0 PME-Enable- DSel=0 DScale=1 PME-
Capabilities: [50] Vital Product Data
How to get this working as we have 3 of these cards for computers without a Gb NIC and I don't want to fight with it 3 separate times.
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May 13, 2010
I'm trying to make a DHCP server work on my CentOS 5.4 box, but I have placed it on another subnet than the one that it is going to serve. I use a helper address on my router to make the the DHCP requests being routed to the DHCP server on the other subnet.
dhcpd.conf file:
ddns-update-style interim
ignore client-updates
ubnet 10.160.195.160 netmask 255.255.255.224
[code]...
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Mar 31, 2011
configuring DHCP server with two NICs. I need DHCP server with 2 NICs:
eth1 - 192.168.103.11
eth2 - 192.168.123.11
The client also has two NICs and suppose to receive ip addresses eth1 from 192.168.103.0 and eth2 from 192.168.123.0 Here is the dhcpd.conf from dhcp server:
ddns-update-style interim;
authoritative;
ignore client-updates;
[code]....
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May 26, 2010
I did a yum update this morning that included a dnsmasq update. Subsequently, for an unrelated reason, I restarted dnsmasq, but it failed because /etc/dnsmasq.d didn't exist. It looks like my /etc/dnsmasq.conf file now includes "conf-dir=/etc/dnsmasq.d" at the end. Since dnsmasq was starting and I didn't remove dnsmasq.d, I assume this line was added by the update. Commenting the line resolves the issue.
An alternative hypothesis, given that I don't really know what the state of /etc/dnsmasq.conf and /etc/dnsmasq.d/ was before the update, might be that the directory did exist, but was removed by the update. I find this the least likely of my 2 stated hypotheses. (There are other hypotheses, but I think they are even less likely). Am I correct is concluding the conf-dir line was added by the update? If so, shouldn't the updated RPM create the directory during install?
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Dec 11, 2009
I was just wondering if someone could tell me the best method to connect all my hardwares together to achieve better result.HARDWARES.Cable ModemNETGEAR ROUTERNETGEAR FS728TS Smart switchLINUX SERVER WITH 2NICS.I want my dhcp server to serve 3VLAN networks. I need someone to show me how to do this. What do I need to do. keep in mind, I want eth0 to be used for public address only while eth1 for LAN. DHCP will be on eth0, but I need LAN on eth1 to be relayed back to eth0. This is my school project.
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Aug 23, 2010
I'm new to CentOS and has recently use it.
I'm looking for a way to configure DHCP client so it would dynamically set the hostname and register itself to a DNS server. I don't have access to the DNS server.
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Oct 24, 2010
I've got a bit of a question. My network is laid out like this:
The role assignments are thus:
Firewall - sorts out the passing through to the 3 different networks, and acts as the traffic proxy.
Windows 2003 server - Does Active Directory and DNS
CentOS server - FTP and DHCP
Now, my problem is I need the CentOS server to be able to assign IP address to both networks, however, the CentOS server can *ONLY* be connected via the one interface to the firewall. It needs to assign the Windows 2003 server and the eth0 of the firewall an IP address via static DHCP, but it also needs to able to assign the clients dynamically via any address in the 10.23.1.0/24 range. I was thinking that I would be able to create static only assignments for the servers via their MAC addresses, and only have 1 dynamically assignable entry for the clients, and then get the firewall to allow ports 67 and 68 to flow freely between eth0 and eth1, but I wasn't entirely sure of the best way to do all this.
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Apr 29, 2010
I have Centos 5.4 installed on my server. Everything works perfect, however sometimes apache does not work properly. When I write my domain to browser it tries to reach the site, however it can't get any result. (There is no "browser couldn't find" error). The browser just tries to get the content.
When I login to my server with ssh using my domain name, there is no problem. (Named works.) When I give the "service httpd restart" command the problem disappears.I looked at httpd log files but there wasn't any problem at that time.I use the API's of the Facebook and Twitter, so there are many Curl requests are made with PHP. Could that be the reason?
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Sep 21, 2010
I have openvpn tunnel setup between two CentOS servers. One of the CentOS servers also acts as a DHCP server for some client computers.
Server A= OpenVPN server
Server B= OpenVPN client (connects to Server A with OpenVPN)
The two CentOS servers can ping each other (172.16.0.0/24) via the tun0.
However, client computer connected to Server B (DHCP server) can't reach 172.16.0.1 (which is the OpenVPN server).
I think I am missing some routing in my "ip route show". Following is the full picture:
What command can I issue to get this fixed? something along ip route add?
There is no firewall service on both end. service iptables stop! I can't bridge eth1 and tun0 as DHCP server might mess up the other side. I can't do a push of "redirect-gateway def1" because then clients loose their IP as they send DHCP requests to Server A.
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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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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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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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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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Nov 16, 2010
I have CentOS 5.5 x86_64 with Apache, php and mysql.
I have just installed OTRS (helpdesk - trouble ticket system) on that server and no users.
This system works with perl, apache and mysql.
I notice that is slow to respond and at times unresponsive the apache welcome page. code...
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Oct 7, 2009
I have a problem on my LAN, then: I have a laptop on which Windows Vista is installed, and every time I try to do ping to my server centos, my centos server does not respond to ping. The server is operating normally, because I found other PCs on my network that communicate normally with my centos server.
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Aug 11, 2009
I cannot get either sendmail or postfix to send a 220 response, nor respond with details. See below for sample telnet output. Details: I have a server that requires email, but only for light use. I'm definitely not an expert, but I have set up a sendmail configuration on a previous server. I tried to configure sendmail first and then postfix later, when I couldn't get sendmail working. I'm not sure exactly what the problem is, but I have a feeling the following might yield some important information. Note: this is the result for Postfix, but virtually the same thing happened with sendmail, too. That is, initially the telnet connection would close immediately. Afterwords, I could connect a second time but then it never responded with a 220 banner nor any 250's.
[Code]...
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Dec 30, 2010
I am running dnsmasq in debian lenny, wvdial connecting but dnsmasq doesn't work, the /var/run/dnsmasq/resolv.conf file is empty this is /var/log/syslog:
The /etc/resolv.conf and /etc/resolvconf/run/resolv.conf is ok:
This is my /etc/dnsmasq.conf:
[url]
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Jan 21, 2010
I am trying to get a server to boot off the lan (pxe). I added a tftp server and tested it as operating successfully. I just plugged the pxe-server in and see the dhcp request/response as expected. The pxe-server then sends out an arp to the same address as the dhcp exchange, but the server never responds.
1. as the pxe-server already has info on the mac/ip-addr, why is it now sending another arp
2. why doesn't the server respond? I have most of my network setup the same way and the dhcp exchange is fine.
3. I'm guessing that the arp is triggered by the bootp exchange (next-server).
I do not have the server in the host table under that address.
127.0.0.1 localhost
127.0.1.1 ubuntu-desktop
192.168.5.101 windows1
Do I need to add 192.168.5.120 with a name to get arp to respond?
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Dec 27, 2010
ubuntu: 10.04dnsmasq: 2.52-1ubuntu0.1I've installed dnsmasq and it is performing DNS duties correctly. I'd like to limit access to the dnsmasq service to a specific address or interface. I've tried adding variations and combinations of the following to /etc/dnsmasq.conf:
Code:
interface=eth0
and
[code]....
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