Date: Sat, 29 Dec 2012 13:09:49 -0600 From: dweimer <dweimer@dweimer.net> To: <freebsd-questions@freebsd.org> Subject: Re: static ip address and ifconfig Message-ID: <29b73b32ef10a5f868eb1e3bbc6a0a95@dweimer.net> In-Reply-To: <50DF3A61.6040307@a1poweruser.com> References: "\"<50DF24BC.20507@a1poweruser.com>" <20121229124207.110dca60@europa>" <50DF30EA.1030408@a1poweruser.com> <20121229191604.cff1a883.freebsd@edvax.de> <50DF3A61.6040307@a1poweruser.com>
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On 2012-12-29 12:45, Fbsd8 wrote: > Polytropon wrote: >> On Sat, 29 Dec 2012 13:05:30 -0500, Fbsd8 wrote: >>> Mike Jeays wrote: >>>> On Sat, 29 Dec 2012 12:13:32 -0500 >>>> Fbsd8 <fbsd8@a1poweruser.com> wrote: >>>> >>>>> I don't have static ip address so I can not find out for myself. >>>>> Lets say I am a company that my ISP has assigned us >>>>> 25 static ip address. >>>>> >>>>> When I issue the ifconfig command what will it show me? >>>>> >>>>> Just the single primary static ip address or all 25 of them in a >>>>> list? >>>>> >>>>> Thanks >>>>> _______________________________________________ >>>> It will just show the one currently assigned. >>>> >>>> Try it - just bring up an xterm and type 'ifconfig' You don't have >>>> to be root, and you can't do any harm. >>>> >>>> >>>> em0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 0 >>>> mtu 1500 >>>> options=9b<RXCSUM,TXCSUM,VLAN_MTU,VLAN_HWTAGGING,VLAN_HWCSUM> >>>> ether 08:00:27:40:ca:a9 >>>> inet 10.0.2.15 netmask 0xffffff00 broadcast 10.0.2.255 # HERE IT >>>> IS >>>> media: Ethernet autoselect (1000baseT <full-duplex>) >>>> status: active >>>> >>> Nope 10.0.2.15 is a private lan IP address, its not public >>> routable. >>> question has to be answered by some body who has multiple static >>> public routable ip address assigned by their ISP. >> The presented example simply shows a typical ifconfig output. >> On the "inet" line, you can see the assigned IP addresses. >> As per definition, one interface can be assigned more than >> one IP address, and maybe those will show in the ifconfig >> output - however, this depends on your actual setup, for >> example when you have specific network gear that "translates" >> one or more static IP addresses into local addresses that >> are _then_ assigned to individual network interfaces. >> However, at my old location I had assigned one static IP >> address directly delivered to the NIC, and ifconfig did >> show exactly that address. >> Simply try "ifconfig" and show what it prints for YOU. >> > > Yes I understand all that, but lets go deeper into difference between > static and dynamic ip address assigned by the ISP. > > For anyone being a professional company who wants permanent presents > on the internet will pay extra fees for static ip > address because static ip address never change and this is required > for > domain name registration. Dynamic ip address are normally assigned by > the > ISP for home users having dsl or tv cable internet connections. > Dynamic > ip address can change and if used for domain name registration the > users > FQDN will no longer point to the correct host. > > Now to return to the original question. > Say I am a professional company and my ISP assigned me 25 static ip > address. > What will ifconfig show me on the interface facing the public > internet? > Just the single primary static ip address or all 25 of them in a > list? > > > _______________________________________________ > freebsd-questions@freebsd.org mailing list > http://lists.freebsd.org/mailman/listinfo/freebsd-questions > To unsubscribe, send any mail to > "freebsd-questions-unsubscribe@freebsd.org" It still all depends on your configuration, it won't look any different than a static private IP address shows when doing an ifconfig except it will be the public IP. Generally if you have a static IP you will have to set it manually, and it won't get it via DHCP. But I have worked with some DSL connections though that assigned the static IP through a DHCP reservation based on your modem/routers MAC address. However that would only work for a single IP. If you get 25, you can assign those with aliases to make a single server answer on the others as well, common for servers hosting multiple https web sites. Here's an example with Aliases, its from a LAN with private range, but would look no different except IPs if it was public range addresses. This is from my web/email server (the very one this message comes from), the secondary IP is for running jails, when testing upgrades. LAN: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 0 mtu 9000 options=209b<RXCSUM,TXCSUM,VLAN_MTU,VLAN_HWTAGGING,VLAN_HWCSUM,WOL_MAGIC> ether 00:07:e9:09:be:4f inet 192.168.5.1 netmask 0xffffff00 broadcast 192.168.5.255 inet 192.168.5.21 netmask 0xffffff00 broadcast 192.168.5.255 nd6 options=29<PERFORMNUD,IFDISABLED,AUTO_LINKLOCAL> media: Ethernet autoselect (1000baseT <full-duplex>) status: active Here's an example from a public range, pulled this from my pfSense box, which is on a Cable Connection with a block of 5 static IP Addresses. vr1: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 0 mtu 1500 options=8280b<RXCSUM,TXCSUM,VLAN_MTU,WOL_UCAST,WOL_MAGIC,LINKSTATE> ether 00:0d:b9:1c:78:2d inet 24.240.198.186 netmask 0xfffffff8 broadcast 24.240.198.191 inet6 fe80::20d:b9ff:fe1c:782d%vr1 prefixlen 64 scopeid 0x2 nd6 options=43<PERFORMNUD,ACCEPT_RTADV> media: Ethernet autoselect (100baseTX <full-duplex>) status: active There's just a single IP set, though it does relay connections on other IPs, using proxy arp to do this so there is no need for an alias to be defined. -- Thanks, Dean E. Weimer http://www.dweimer.net/
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