Re: IP addresses on local network change
On Wed, 2014-10-08 at 06:42 +0800, Ed Greshko wrote: > The analogy of the telephone number and extension is a good one. The > only thing I would add is that the extension (port/service) number is > generally fixed, standardized. > > A list is kept by the IANA (Internet Assigned Numbers Authority) and > can be seen here > > http://www.iana.org/assignments/service-names-port-numbers/service-names-port-numbers.xhtml You can also see the default ports on your machine by looking at /etc/services. Note that most of these are not normally active. poc -- users mailing list users@lists.fedoraproject.org To unsubscribe or change subscription options: https://admin.fedoraproject.org/mailman/listinfo/users Fedora Code of Conduct: http://fedoraproject.org/code-of-conduct Guidelines: http://fedoraproject.org/wiki/Mailing_list_guidelines Have a question? Ask away: http://ask.fedoraproject.org
Re: IP addresses on local network change
Thank you to all Regards Angelo On Wed, Oct 8, 2014 at 1:42 AM, Ed Greshko wrote: > On 10/07/14 23:53, Angelo Moreschini wrote: > > thank you Ed, I learned many things from you. Actually I am a Linux > beginner > > Welcome to Linux. > > Mostly what has been discussed here is networking concepts. The same > applies to any network connected device just the location and way the > configuration information is stored and handled is different . > > > > Just another question, if I can, please: > > it exists some fix relation between the "port number" of the servers > and the theirs IP number ? > > > > It is some kind of correlation between them ? > > The analogy of the telephone number and extension is a good one. The only > thing I would add is that the extension (port/service) number is generally > fixed, standardized. > > A list is kept by the IANA (Internet Assigned Numbers Authority) and can > be seen here > > > http://www.iana.org/assignments/service-names-port-numbers/service-names-port-numbers.xhtml > > > -- > If you can't laugh at yourself, others will gladly oblige. > > -- > users mailing list > users@lists.fedoraproject.org > To unsubscribe or change subscription options: > https://admin.fedoraproject.org/mailman/listinfo/users > Fedora Code of Conduct: http://fedoraproject.org/code-of-conduct > Guidelines: http://fedoraproject.org/wiki/Mailing_list_guidelines > Have a question? Ask away: http://ask.fedoraproject.org > -- users mailing list users@lists.fedoraproject.org To unsubscribe or change subscription options: https://admin.fedoraproject.org/mailman/listinfo/users Fedora Code of Conduct: http://fedoraproject.org/code-of-conduct Guidelines: http://fedoraproject.org/wiki/Mailing_list_guidelines Have a question? Ask away: http://ask.fedoraproject.org
Re: IP addresses on local network change
On 10/07/14 23:53, Angelo Moreschini wrote: > thank you Ed, I learned many things from you. Actually I am a Linux beginner > Welcome to Linux. Mostly what has been discussed here is networking concepts. The same applies to any network connected device just the location and way the configuration information is stored and handled is different . > > Just another question, if I can, please: > it exists some fix relation between the "port number" of the servers and the > theirs IP number ? > > It is some kind of correlation between them ? The analogy of the telephone number and extension is a good one. The only thing I would add is that the extension (port/service) number is generally fixed, standardized. A list is kept by the IANA (Internet Assigned Numbers Authority) and can be seen here http://www.iana.org/assignments/service-names-port-numbers/service-names-port-numbers.xhtml -- If you can't laugh at yourself, others will gladly oblige. -- users mailing list users@lists.fedoraproject.org To unsubscribe or change subscription options: https://admin.fedoraproject.org/mailman/listinfo/users Fedora Code of Conduct: http://fedoraproject.org/code-of-conduct Guidelines: http://fedoraproject.org/wiki/Mailing_list_guidelines Have a question? Ask away: http://ask.fedoraproject.org
Re: IP addresses on local network change
On 10/07/2014 08:53 AM, Angelo Moreschini wrote: Just another question, if I can, please: it exists some fix relation between the "port number" of the servers and the theirs IP number ? No. Think of the IP as the machine's phone number, and the port number as a particular service's extension. Thus, to connect to a web server, you need to use the machine's IP address and the port number (or extension) of the web server. -- users mailing list users@lists.fedoraproject.org To unsubscribe or change subscription options: https://admin.fedoraproject.org/mailman/listinfo/users Fedora Code of Conduct: http://fedoraproject.org/code-of-conduct Guidelines: http://fedoraproject.org/wiki/Mailing_list_guidelines Have a question? Ask away: http://ask.fedoraproject.org
Re: IP addresses on local network change
thank you Ed, I learned many things from you. Actually I am a Linux
beginner
Just another question, if I can, please:
it exists some fix relation between the "port number" of the servers and
the theirs IP number ?
It is some kind of correlation between them ?
On Tue, Oct 7, 2014 at 1:40 PM, Ed Greshko wrote:
> On 10/07/14 16:43, Angelo Moreschini wrote:
> > I made it.
> > The optut was:
> > option dhcp-server-identifier 10.0.0.138;
> > option dhcp-server-identifier 10.0.0.138;
> > option dhcp-server-identifier 10.0.0.138;
> > option dhcp-server-identifier 10.0.0.138;
> > option dhcp-server-identifier 10.0.0.138;
> > option dhcp-server-identifier 10.0.0.138;
> > option dhcp-server-identifier 10.0.0.138;
> > option dhcp-server-identifier 10.0.0.138;
> > option dhcp-server-identifier 10.0.0.138;
> > option dhcp-server-identifier 10.0.0.138;
> >
> > they look to be the same...
> > however, are not able to interpret this value ...
>
> 10.0.0.138 is the IP address of the server providing your system with
> configuration information.
>
> Dave Ihnat had brought up the prospect that there could have been 2 DHCP
> servers to explain the changes in your system's address. But, as you can
> see, there is only one
>
> And..
> >
> >
> > here I write two complete records (the last two):
> >
> > lease {
> > interface "em0";
> > fixed-address 10.0.0.1;
> > option subnet-mask 255.255.255.0;
> > option routers 10.0.0.138;
> > option dhcp-lease-time 3600;
> > option dhcp-message-type 5;
> > option domain-name-servers 10.0.0.138;
> > option dhcp-server-identifier 10.0.0.138;
> > option domain-name "Home";
> > renew 2 2014/10/07 08:05:32;
> > rebind 2 2014/10/07 08:29:41;
> > expire 2 2014/10/07 08:37:11;
> > }
> > lease {
> > interface "em0";
> > fixed-address 10.0.0.3;
> > option subnet-mask 255.255.255.0;
> > option routers 10.0.0.138;
> > option dhcp-lease-time 3600;
> > option dhcp-message-type 5;
> > option domain-name-servers 10.0.0.138;
> > option dhcp-server-identifier 10.0.0.138;
> > option domain-name "Home";
> > renew 2 2014/10/07 08:34:07;
> > rebind 2 2014/10/07 08:58:03;
> > expire 2 2014/10/07 09:05:33;
> > }
> >
> >
> > what it mean ?
> >
>
> You can see that the server at 10.0.0.138 has provided you with 2
> different IP addresses a different times. 10.0.0.1 and 10.0.0.3
> (fixed-address).
>
> There is no problem with your system. And, there is no problem with the
> DHCP server. It just seems to be the policy of the entity responsible for
> the DHCP server not to maintain the same IP address.
>
> You can contact the person responsible for the DHCP server to see if they
> can, or will, assign you a fixed IP address. If that is not possible, you
> may have to use a Dynamic DNS service.
>
> --
> If you can't laugh at yourself, others will gladly oblige.
>
> --
> users mailing list
> users@lists.fedoraproject.org
> To unsubscribe or change subscription options:
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Re: IP addresses on local network change
On 10/07/14 16:43, Angelo Moreschini wrote:
> I made it.
> The optut was:
> option dhcp-server-identifier 10.0.0.138;
> option dhcp-server-identifier 10.0.0.138;
> option dhcp-server-identifier 10.0.0.138;
> option dhcp-server-identifier 10.0.0.138;
> option dhcp-server-identifier 10.0.0.138;
> option dhcp-server-identifier 10.0.0.138;
> option dhcp-server-identifier 10.0.0.138;
> option dhcp-server-identifier 10.0.0.138;
> option dhcp-server-identifier 10.0.0.138;
> option dhcp-server-identifier 10.0.0.138;
>
> they look to be the same...
> however, are not able to interpret this value ...
10.0.0.138 is the IP address of the server providing your system with
configuration information.
Dave Ihnat had brought up the prospect that there could have been 2 DHCP
servers to explain the changes in your system's address. But, as you can see,
there is only one
And..
>
>
> here I write two complete records (the last two):
>
> lease {
> interface "em0";
> fixed-address 10.0.0.1;
> option subnet-mask 255.255.255.0;
> option routers 10.0.0.138;
> option dhcp-lease-time 3600;
> option dhcp-message-type 5;
> option domain-name-servers 10.0.0.138;
> option dhcp-server-identifier 10.0.0.138;
> option domain-name "Home";
> renew 2 2014/10/07 08:05:32;
> rebind 2 2014/10/07 08:29:41;
> expire 2 2014/10/07 08:37:11;
> }
> lease {
> interface "em0";
> fixed-address 10.0.0.3;
> option subnet-mask 255.255.255.0;
> option routers 10.0.0.138;
> option dhcp-lease-time 3600;
> option dhcp-message-type 5;
> option domain-name-servers 10.0.0.138;
> option dhcp-server-identifier 10.0.0.138;
> option domain-name "Home";
> renew 2 2014/10/07 08:34:07;
> rebind 2 2014/10/07 08:58:03;
> expire 2 2014/10/07 09:05:33;
> }
>
>
> what it mean ?
>
You can see that the server at 10.0.0.138 has provided you with 2 different IP
addresses a different times. 10.0.0.1 and 10.0.0.3 (fixed-address).
There is no problem with your system. And, there is no problem with the DHCP
server. It just seems to be the policy of the entity responsible for the DHCP
server not to maintain the same IP address.
You can contact the person responsible for the DHCP server to see if they can,
or will, assign you a fixed IP address. If that is not possible, you may have
to use a Dynamic DNS service.
--
If you can't laugh at yourself, others will gladly oblige.
--
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Re: IP addresses on local network change
I made it.
The optut was:
option dhcp-server-identifier 10.0.0.138;
option dhcp-server-identifier 10.0.0.138;
option dhcp-server-identifier 10.0.0.138;
option dhcp-server-identifier 10.0.0.138;
option dhcp-server-identifier 10.0.0.138;
option dhcp-server-identifier 10.0.0.138;
option dhcp-server-identifier 10.0.0.138;
option dhcp-server-identifier 10.0.0.138;
option dhcp-server-identifier 10.0.0.138;
option dhcp-server-identifier 10.0.0.138;
they look to be the same...
however, are not able to interpret this value ...
here I write two complete records (the last two):
lease {
interface "em0";
fixed-address 10.0.0.1;
option subnet-mask 255.255.255.0;
option routers 10.0.0.138;
option dhcp-lease-time 3600;
option dhcp-message-type 5;
option domain-name-servers 10.0.0.138;
option dhcp-server-identifier 10.0.0.138;
option domain-name "Home";
renew 2 2014/10/07 08:05:32;
rebind 2 2014/10/07 08:29:41;
expire 2 2014/10/07 08:37:11;
}
lease {
interface "em0";
fixed-address 10.0.0.3;
option subnet-mask 255.255.255.0;
option routers 10.0.0.138;
option dhcp-lease-time 3600;
option dhcp-message-type 5;
option domain-name-servers 10.0.0.138;
option dhcp-server-identifier 10.0.0.138;
option domain-name "Home";
renew 2 2014/10/07 08:34:07;
rebind 2 2014/10/07 08:58:03;
expire 2 2014/10/07 09:05:33;
}
what it mean ?
On Tue, Oct 7, 2014 at 11:05 AM, Ed Greshko wrote:
> On 10/07/14 15:47, Angelo Moreschini wrote:
> > for me the value is :
> > lf
> /var/lib/NetworkManager/dhclient-40d1ee1f-f089-4c90-afd9-e37016bc720c-em0.lease
> >
> > but I don't know about what file are you talking ...
>
> cat
> /var/lib/NetworkManager/dhclient-40d1ee1f-f089-4c90-afd9-e37016bc720c-em0.lease
> | grep dhcp-server-identifier
>
> Are they all the same?
>
> --
> If you can't laugh at yourself, others will gladly oblige.
> --
> users mailing list
> users@lists.fedoraproject.org
> To unsubscribe or change subscription options:
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>
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Re: IP addresses on local network change
On 10/07/14 15:47, Angelo Moreschini wrote: > for me the value is : > lf > /var/lib/NetworkManager/dhclient-40d1ee1f-f089-4c90-afd9-e37016bc720c-em0.lease > > but I don't know about what file are you talking ... cat /var/lib/NetworkManager/dhclient-40d1ee1f-f089-4c90-afd9-e37016bc720c-em0.lease | grep dhcp-server-identifier Are they all the same? -- If you can't laugh at yourself, others will gladly oblige. -- users mailing list users@lists.fedoraproject.org To unsubscribe or change subscription options: https://admin.fedoraproject.org/mailman/listinfo/users Fedora Code of Conduct: http://fedoraproject.org/code-of-conduct Guidelines: http://fedoraproject.org/wiki/Mailing_list_guidelines Have a question? Ask away: http://ask.fedoraproject.org
Re: IP addresses on local network change
for me the value is : lf /var/lib/NetworkManager/dhclient-40d1ee1f-f089-4c90-afd9-e37016bc720c-em0.lease but I don't know about what file are you talking ... thank you On Mon, Oct 6, 2014 at 4:22 PM, Ed Greshko wrote: > On 10/06/14 20:51, Dave Ihnat wrote: > > I would also wonder if there are dueling DHCP servers > > on the segment. > > You should be able to determine if there are dueling DHCP servers by doing > a "ps -eaf | grep dhclient" and looking for the -lf parameter and then > examining the contents of the file. > > In my case -lf > /var/lib/NetworkManager/dhclient-5ce325cb-5048-48d7-bdc0-457f278fe1f1-enp0s3.lease > > Looking at the file you'd find "dhcp-server-identifier" and multiple > leases. If the IP address of "dhcp-server-identifier" changes, then you > have dueling DHCP servers. > > -- > If you can't laugh at yourself, others will gladly oblige. > > -- > users mailing list > users@lists.fedoraproject.org > To unsubscribe or change subscription options: > https://admin.fedoraproject.org/mailman/listinfo/users > Fedora Code of Conduct: http://fedoraproject.org/code-of-conduct > Guidelines: http://fedoraproject.org/wiki/Mailing_list_guidelines > Have a question? Ask away: http://ask.fedoraproject.org > -- users mailing list users@lists.fedoraproject.org To unsubscribe or change subscription options: https://admin.fedoraproject.org/mailman/listinfo/users Fedora Code of Conduct: http://fedoraproject.org/code-of-conduct Guidelines: http://fedoraproject.org/wiki/Mailing_list_guidelines Have a question? Ask away: http://ask.fedoraproject.org
Re: IP addresses on local network change
On 10/06/14 20:51, Dave Ihnat wrote: > I would also wonder if there are dueling DHCP servers > on the segment. You should be able to determine if there are dueling DHCP servers by doing a "ps -eaf | grep dhclient" and looking for the -lf parameter and then examining the contents of the file. In my case -lf /var/lib/NetworkManager/dhclient-5ce325cb-5048-48d7-bdc0-457f278fe1f1-enp0s3.lease Looking at the file you'd find "dhcp-server-identifier" and multiple leases. If the IP address of "dhcp-server-identifier" changes, then you have dueling DHCP servers. -- If you can't laugh at yourself, others will gladly oblige. -- users mailing list users@lists.fedoraproject.org To unsubscribe or change subscription options: https://admin.fedoraproject.org/mailman/listinfo/users Fedora Code of Conduct: http://fedoraproject.org/code-of-conduct Guidelines: http://fedoraproject.org/wiki/Mailing_list_guidelines Have a question? Ask away: http://ask.fedoraproject.org
Re: IP addresses on local network change
On 10/06/2014 02:51 PM, Dave Ihnat wrote: On Mon, Oct 06, 2014 at 02:22:42PM +0200, Ralf Corsepius wrote: On 10/06/2014 01:02 PM, Angelo Moreschini wrote: That's not unusual with DHCP. DHCP assigned IP-addresses usually have limited life-time until they expire. After expiration machines may be assigned a new IP-address. However, I will point out that DHCP servers _tend_ to reassign the same IP address to a machine renewing its lease. Sure. But I've seen some implementations (on home-routers), which were not doing so, but iterated through the whole pool of addresses, instead. Ralf -- users mailing list users@lists.fedoraproject.org To unsubscribe or change subscription options: https://admin.fedoraproject.org/mailman/listinfo/users Fedora Code of Conduct: http://fedoraproject.org/code-of-conduct Guidelines: http://fedoraproject.org/wiki/Mailing_list_guidelines Have a question? Ask away: http://ask.fedoraproject.org
Re: IP addresses on local network change
On Mon, Oct 06, 2014 at 02:22:42PM +0200, Ralf Corsepius wrote: > On 10/06/2014 01:02 PM, Angelo Moreschini wrote: > That's not unusual with DHCP. DHCP assigned IP-addresses usually > have limited life-time until they expire. After expiration machines > may be assigned a new IP-address. However, I will point out that DHCP servers _tend_ to reassign the same IP address to a machine renewing its lease. If you're seeing the address change frequently, I would also wonder if there are dueling DHCP servers on the segment. Determine what should be the definitive DHCP server and make sure nothing else thinks it is also a DHCP server (e.g., other computers, a firewall/router appliance, etc.) > If you want to access a machine under a static IP-address, you'd > have to set up your DHCP-server accordingly. How to do so would > depend upon you DHCP-server's implementation. Well, actually, there are a couple of approaches: o A DHCP server should be configured to only use a portion of the available IP address range for the subnet. For instance, if you're using a RFC1918 IPv4 subnet of 192.168.100.0/24, it would be common to restrict DHCP to the range 192.168.100.100-199. Anything below or above that range is available for static assignment. o You can reserve IP addresses within the DHCP pool by MAC address. This is usually used when you've a legacy IP assignment that is in the DHCP pool and, for whatever reason, is difficult to change. Cheers, -- Dave Ihnat dih...@dminet.com -- users mailing list users@lists.fedoraproject.org To unsubscribe or change subscription options: https://admin.fedoraproject.org/mailman/listinfo/users Fedora Code of Conduct: http://fedoraproject.org/code-of-conduct Guidelines: http://fedoraproject.org/wiki/Mailing_list_guidelines Have a question? Ask away: http://ask.fedoraproject.org
Re: IP addresses on local network change
On 10/06/2014 01:02 PM, Angelo Moreschini wrote: Hi, I can only think that all can be correlated tothe dynamic assignmentof the IP address (DHCP), My guess would be the same. but the change of the IP happen also if the computers are not rebooted. That's not unusual with DHCP. DHCP assigned IP-addresses usually have limited life-time until they expire. After expiration machines may be assigned a new IP-address. If you want to access a machine under a static IP-address, you'd have to set up your DHCP-server accordingly. How to do so would depend upon you DHCP-server's implementation. Ralf -- users mailing list users@lists.fedoraproject.org To unsubscribe or change subscription options: https://admin.fedoraproject.org/mailman/listinfo/users Fedora Code of Conduct: http://fedoraproject.org/code-of-conduct Guidelines: http://fedoraproject.org/wiki/Mailing_list_guidelines Have a question? Ask away: http://ask.fedoraproject.org
IP addresses on local network change
Hi, I am newbie to Fedora and I would like ask for a (for me important) clarification regarding the assignment of the IP address of the computers of my LAN. Having problems to access to a repository located on another computer on my LAN, I used, several times, the ping command to check the accessibility of the nodes in the network ... With my surprise, the answers that I received using the ping command (with IP number) had not been consistent. ...an IP number available at a certain time was no longer available some time after (and vice-verse); And happened also that non-existent IP addresses in the network occurred as available, ...some times Moreover, a test done with /sbin/ifconfig stated that some IP addresses changed in the time.. ... [angelo@zorro ~]$ /sbin/ifconfig em0: flags=4163 mtu 1500 inet 10.0.0.6 netmask 255.255.255.0 broadcast 10.0.0.255 inet6 fe80::227:eff:fe1f:824c prefixlen 64 scopeid 0x20 ether 00:27:0e:1f:82:4c txqueuelen 1000 (Ethernet) RX packets 28131 bytes 30128278 (28.7 MiB) RX errors 0 dropped 0 overruns 0 frame 0 TX packets 20820 bytes 2430096 (2.3 MiB) TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0 device interrupt 20 memory 0xf210-f212 [angelo@zorro ~]$ /sbin/ifconfig em0: flags=4163 mtu 1500 inet 10.0.0.1 netmask 255.255.255.0 broadcast 10.0.0.255 inet6 fe80::227:eff:fe1f:824c prefixlen 64 scopeid 0x20 ether 00:27:0e:1f:82:4c txqueuelen 1000 (Ethernet) RX packets 44558 bytes 37451123 (35.7 MiB) RX errors 0 dropped 0 overruns 0 frame 0 TX packets 33627 bytes 6296194 (6.0 MiB) TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0 device interrupt 20 memory 0xf210-f212 I didn't expect a such (for me) strange situation, and I would like to have some explanation about it. I can only think that all can be correlated to the dynamic assignment of the IP address (DHCP), but the change of the IP happen also if the computers are not rebooted. If, is possible, I should like have a reference to documentation that can explain this my problem. Thank you Regards Angelo -- users mailing list users@lists.fedoraproject.org To unsubscribe or change subscription options: https://admin.fedoraproject.org/mailman/listinfo/users Fedora Code of Conduct: http://fedoraproject.org/code-of-conduct Guidelines: http://fedoraproject.org/wiki/Mailing_list_guidelines Have a question? Ask away: http://ask.fedoraproject.org
