static ip doesn't have internet access

[carilwang]

I don't get internet access, even ping gateway doesn't work, and ssh into it take long time
here is my /etc/network/interfaces

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auto lo
iface lo inet loopback

auto eth0
iface eth0 inet static
address 192.168.8.21
netmask 255.255.255.0
network	192.168.8.0
broadcast 192.168.8.255
gateway 192.168.8.1

ifconfig

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eth0      Link encap:Ethernet  HWaddr b8:27:eb:75:ba:8b  
          inet addr:192.168.8.21  Bcast:192.168.8.255  Mask:255.255.255.0
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:86519 errors:0 dropped:0 overruns:0 frame:0
          TX packets:43711 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000 
          RX bytes:120471080 (114.8 MiB)  TX bytes:3425212 (3.2 MiB)

lo        Link encap:Local Loopback  
          inet addr:127.0.0.1  Mask:255.0.0.0
          UP LOOPBACK RUNNING  MTU:65536  Metric:1
          RX packets:106 errors:0 dropped:0 overruns:0 frame:0
          TX packets:106 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0 
          RX bytes:9328 (9.1 KiB)  TX bytes:9328 (9.1 KiB)

route -n
Kernel IP routing table

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Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
0.0.0.0         192.168.8.1     0.0.0.0         UG    0      0        0 eth0
192.168.8.0     0.0.0.0         255.255.255.0   U     0      0        0 eth0

It has been like that for couple months, I have to use static dhcp to get static ip. Does anyone know what is going on.

I am using raspbian

[DougieLawson]

Delete the lines

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network   192.168.8.0
broadcast 192.168.8.255

they aren't needed.

Are you sure that 192.168.8.1 is your gateway router address? Check on a system that's working or check what you get if your RPi is re-configured to use DHCP.

[carilwang]

I am very sure those two line is not a problem

here is the ifconfig for the dhcp

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eth0      Link encap:Ethernet  HWaddr b8:27:eb:0a:31:d1  
          inet addr:192.168.8.245  Bcast:192.168.8.255  Mask:255.255.255.0
          inet6 addr: fe80::ba27:ebff:fe0a:31d1/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:3090528 errors:0 dropped:0 overruns:0 frame:0
          TX packets:146750 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000 
          RX bytes:157797933 (150.4 MiB)  TX bytes:18156754 (17.3 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:65536  Metric:1
          RX packets:88 errors:0 dropped:0 overruns:0 frame:0
          TX packets:88 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0 
          RX bytes:8857 (8.6 KiB)  TX bytes:8857 (8.6 KiB)

and the route -n

Kernel IP routing table
Destination Gateway Genmask Flags Metric Ref Use Iface
0.0.0.0 192.168.8.1 0.0.0.0 UG 0 0 0 eth0
192.168.8.0 0.0.0.0 255.255.255.0 U 0 0 0 eth0

[DougieLawson]

So when you switch back to a static address can you try
ping -c3 192.168.8.1
ping -c3 8.8.8.8
ping -c3 google.com

Those two lines are 100% pointless, with a known address, gateway and netmask your system can calculate the network ID and the broadcast address (and it will always get the right answer).

[rpdom]

Hang on... your interfaces file says

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address 192.168.8.21

but your ifconfig shows

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          inet addr:192.168.8.245

perhaps you are getting a dhcp address instead/as well and that is messing things up?

This has been happening since the decision to drop support for interfaces and move to dhcpcd5 instead. You may need to either tell dhcpcd5 (if it is installed) to let interfaces handle eth0, or set your static address there instead (/etc/dhcpcd.conf) http://manpages.debian.org/cgi-bin/man. ... hcpcd.conf
Look at either "deny interfaces", or "static value" in that man page.

[DougieLawson]

With the new raspberrypi-net-mods you CAN NOT set static addresses in /etc/network/interfaces.

You MUST have this

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# Please note that this file is written to be used with dhcpcd.
# For static IP, consult /etc/dhcpcd.conf and 'man dhcpcd.conf'.

auto lo
iface lo inet loopback

auto eth0
allow-hotplug eth0
iface eth0 inet manual

auto wlan0
allow-hotplug wlan0
iface wlan0 inet manual
wpa-conf /etc/wpa_supplicant/wpa_supplicant.conf

auto wlan1
allow-hotplug wlan1
iface wlan1 inet manual
wpa-conf /etc/wpa_supplicant/wpa_supplicant.conf

in your interfaces file.

The place to set your static address is in /etc/dhcpcd.conf by adding this

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interface eth0
static ip_address=192.168.0.10/24
static routers=192.168.0.1
static domain_name_servers=192.168.0.1

to the bottom of that file.