[CentOS] Forgetting network settings

cahit Eyigünlü cahit.eyigunlu at gmail.com
Mon Mar 29 15:00:04 UTC 2010


Thanks rohan but our gateway on 24 ip block so i need to do it on way that i
send , unortunately this wont work becuase that is a global ip adress and
they can not set a gateway for each 255 block for ex. i have 5 more ip 2 of
them is on 78.159.xx.xx block so i need to set default gw to 217.20.117.1

2010/3/29 Rohan Gilchrist <rohan at gilchrist.me>

> So you're saying that your default gateway is an IP address that's part of
> a *different* network/subnet?
>
> I don't know how this network has been designed, but typically I would
> expect that your default gateway would be something like
>
> 188.72.255.1
>
> rather than 217.20.117.1 that you've mentioned earlier.
>
> Take a look at mine for example:
>
> [~]ifconfig
> eth0      Link encap:Ethernet  HWaddr FE:FD:6D:4A:C1:69
>           inet addr:109.xx.xxx.105  Bcast:109.74.193.255
>  Mask:255.255.255.0
>           inet6 addr: fe80::fcfd:6dff:fe4a:c169/64 Scope:Link
>            UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
>            RX packets:78742 errors:0 dropped:0 overruns:0 frame:0
>           TX packets:67114 errors:0 dropped:0 overruns:0 carrier:0
>           collisions:0 txqueuelen:1000
>           RX bytes:35442733 (33.8 MiB)  TX bytes:12607832 (12.0 MiB)
>
> lo        Link encap:Local Loopback
>           inet addr:127.0.0.1  Mask:255.0.0.0
>           inet6 addr: ::1/128 Scope:Host
>           UP LOOPBACK RUNNING  MTU:16436  Metric:1
>            RX packets:8292 errors:0 dropped:0 overruns:0 frame:0
>           TX packets:8292 errors:0 dropped:0 overruns:0 carrier:0
>           collisions:0 txqueuelen:0
>           RX bytes:1195297 (1.1 MiB)  TX bytes:1195297 (1.1 MiB)
>
> [~]netstat -rn
> Kernel IP routing table
> Destination     Gateway         Genmask         Flags   MSS Window  irtt
> Iface
> 109.xx.xxx.0    0.0.0.0         255.255.255.0   U         0 0          0
> eth0
> 169.254.0.0     0.0.0.0         255.255.0.0     U         0 0          0
> eth0
> 0.0.0.0         109.xx.xxx.1    0.0.0.0         UG        0 0          0
> eth0
>
> So you can see my host has .105 assigned to eth0, and the default gateway
> is .1 of the same network/subnet.
>
> You might want to check that your addressing is correct.
>
>
>
> On Mon, 29 Mar 2010, cahit Eyig?nl? wrote:
>
> > there is no problem with my internet connection i just want that to do
> this cent os automatically :route add default gw 217.20.117.1
> > before typing this my netstat -rn looks like this :
> > root at lin3 [~]# netstat -rn (that is not able to connect to internet)
> > Kernel IP routing table
> > Destination     Gateway         Genmask         Flags   MSS Window  irtt
> Iface
> > 217.20.117.1    0.0.0.0         255.255.255.255 UH        0 0          0
> eth0
> > 188.72.255.0    0.0.0.0         255.255.255.0   U         0 0          0
> eth0
> > 169.254.0.0     0.0.0.0         255.255.0.0     U         0 0          0
> eth0
> > after adding gateway : (this works perfect)
> > root at lin3 [~]# netstat -rn
> > Kernel IP routing table
> > Destination     Gateway         Genmask         Flags   MSS Window  irtt
> Iface
> > 217.20.117.1    0.0.0.0         255.255.255.255 UH        0 0          0
> eth0
> > 188.72.255.0    0.0.0.0         255.255.255.0   U         0 0          0
> eth0
> > 169.254.0.0     0.0.0.0         255.255.0.0     U         0 0          0
> eth0
> > 0.0.0.0         217.20.117.1    0.0.0.0         UG        0 0          0
> eth0
> >
> > i just want to add bold line automatically
> >
> > and this is my ifconfig :
> > root at lin3 [~]# ifconfig -a
> > eth0      Link encap:Ethernet  HWaddr 00:0C:29:83:21:44
> >           inet addr:188.72.255.189  Bcast:188.72.255.255
>  Mask:255.255.255.0
> >           inet6 addr: fe80::20c:29ff:fe83:2144/64 Scope:Link
> >           UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
> >           RX packets:9653 errors:0 dropped:0 overruns:0 frame:0
> >           TX packets:458 errors:0 dropped:0 overruns:0 carrier:0
> >           collisions:0 txqueuelen:1000
> >           RX bytes:876648 (856.1 KiB)  TX bytes:50814 (49.6 KiB)
> >           Base address:0x2000 Memory:d8920000-d8940000
> >
> > lo        Link encap:Local Loopback
> >           inet addr:127.0.0.1  Mask:255.0.0.0
> >           inet6 addr: ::1/128 Scope:Host
> >           UP LOOPBACK RUNNING  MTU:16436  Metric:1
> >           RX packets:483 errors:0 dropped:0 overruns:0 frame:0
> >           TX packets:483 errors:0 dropped:0 overruns:0 carrier:0
> >           collisions:0 txqueuelen:0
> >           RX bytes:75305 (73.5 KiB)  TX bytes:75305 (73.5 KiB)
> >
> > sit0      Link encap:IPv6-in-IPv4
> >           NOARP  MTU:1480  Metric:1
> >           RX packets:0 errors:0 dropped:0 overruns:0 frame:0
> >           TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
> >           collisions:0 txqueuelen:0
> >           RX bytes:0 (0.0 b)  TX bytes:0 (0.0 b)
> >
> >
> >
> > 2010/3/29 Matt Iavarone <matt.iavarone at gmail.com>
> >       2010/3/29 cahit Eyig?nl? <cahit.eyigunlu at gmail.com>:
> > > This is my two line on route-eth0
> > >  address0=217.20.117.1
> > >  subnet0=255.255.255.255
> > > but what should be next line for default gateway the only thing that i
> could
> > > not complete is default gateway setting
> > > and my netstat table must looklike this :
> > > Destination     Gateway         Genmask         Flags   MSS Window
>  irtt
> > > Iface
> > > 217.20.117.1    0.0.0.0         255.255.255.255 UH        0 0
>  0
> > > eth0
> > > xx.xx.xx.0     0.0.0.0         255.255.255.0   U         0 0          0
> eth0
> > > 0.0.0.0         217.20.117.1    0.0.0.0         UG        0 0
>  0
> > > eth0
> > > and now i see only the first two line truely i am adding 3rd line on
> every
> > > time restart manually with route add default gw
> > >
> > > 2010/3/29 Les Mikesell <lesmikesell at gmail.com>
> > >>
> > >> cahit Eyig?nl? wrote:
> > >> > i am reaching the network with this :
> > >> > route add -net 217.20.117.1 netmask 255.255.255.255 dev eth0
> > >> > route add default gw 217.20.117.1
> > >> >
> > >> > i have added eth0
> > >> > address0=217.20.117.1
> > >> > subnet0=255.255.255.255
> > >> >
> > >> > the first command is ok but how could i set the second command to
> cent
> > >> > os to do it automatically
> > >> >
> > >>
> > >> If you create a file named /etc/sysconfig/network-scripts/route-eth0
> you
> > >> can put
> > >> lines in it that will have 'ip route' added at the beginning and
> executed
> > >> after
> > >> the interface is up.  "ip route" takes some different arguments than
> the
> > >> "route"
> > >> command - see "man ip" for details.
> > >>
> > >> --
> > >>   Les Mikesell
> > >>   lesmikesell at gmail.com
> > >>
> > >>
> > >>
> > >> _______________________________________________
> > >> CentOS mailing list
> > >> CentOS at centos.org
> > >> http://lists.centos.org/mailman/listinfo/centos
> > >
> > >
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> > >
> > >
> >
> > Why don't you post the results of 'ifconfig -a' and 'ip route show'?
> > Giving information piecemeal is not helping anyone.
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> >
> >
> >
> >
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