Cannot access router IP any more

**istvan5** · December 19th, 2019

Hi !

I did nothing, but I cannot access my router any more. Router address should be 192.168.0.1.
Something messed up. It looks very strange. Anybody an idea what's the solution?

What I know is, that the router is updated sometimes by the operator. Maybe they created a bug?

Internet -> Router -> this PC (Internet still works)

Ubuntu 16.04.6 LTS, Release 16.04, Codename xenial

Thank you!

what I checked and tried:

Code:

xx@Shuttle:~$ netstat -r
Kernel IP routing table
Destination     Gateway         Genmask         Flags   MSS Window  irtt Iface
default         gate90-146-207. 0.0.0.0         UG        0 0          0 eth0
90.146.207.0    *               255.255.255.0   U         0 0          0 eth0
dhcp-prim.liwes gate90-146-207. 255.255.255.255 UGH       0 0          0 eth0

Code:

xx@Shuttle:~$ netstat -r | awk '/default/ {print $2}'
gate90-146-207.

Code:

xx@Shuttle:~$ netstat -rn
Kernel IP routing table
Destination     Gateway         Genmask         Flags   MSS Window  irtt Iface
0.0.0.0         90.146.207.1    0.0.0.0         UG        0 0          0 eth0
90.146.207.0    0.0.0.0         255.255.255.0   U         0 0          0 eth0
212.33.36.130   90.146.207.1    255.255.255.255 UGH       0 0          0 eth0

Code:

xx@Shuttle:~$ route -n
Kernel IP routing table
Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
0.0.0.0         90.146.207.1    0.0.0.0         UG    100    0        0 eth0
90.146.207.0    0.0.0.0         255.255.255.0   U     100    0        0 eth0
212.33.36.130   90.146.207.1    255.255.255.255 UGH   100    0        0 eth0

Code:

xx@Shuttle:~$ ip route
default via 90.146.207.1 dev eth0  proto static  metric 100 
90.146.207.0/24 dev eth0  proto kernel  scope link  src 90.146.207.78  metric 100 
212.33.36.130 via 90.146.207.1 dev eth0  proto dhcp  metric 100

Code:

xx@Shuttle:~$ ifconfig
eth0      Link encap:Ethernet  HWaddr 80:ee:73:73:3e:51  
          inet addr:90.146.207.78  Bcast:90.146.207.255  Mask:255.255.255.0
          inet6 addr: fe80::8281:ce72:b36c:9e67/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:346145 errors:0 dropped:0 overruns:0 frame:0
          TX packets:54354 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000 
          RX bytes:85404651 (85.4 MB)  TX bytes:10856295 (10.8 MB)


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:3182 errors:0 dropped:0 overruns:0 frame:0
          TX packets:3182 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1 
          RX bytes:566293 (566.2 KB)  TX bytes:566293 (566.2 KB)

Code:

xx@Shuttle:~$ sudo route add default gw 192.168.0.1
SIOCADDRT: Network is unreachable

Code:

xx@Shuttle:~$ sudo ip route add default via 192.168.0.1
RTNETLINK answers: Network is unreachable

Code:

xx@Shuttle:~$ sudo lshw -class network
  *-network DISABLED      
       description: Wireless interface
       product: RTL8188CE 802.11b/g/n WiFi Adapter
       vendor: Realtek Semiconductor Co., Ltd.
       physical id: 0
       bus info: pci@0000:01:00.0
       logical name: wlan0
       version: 01
       serial: 64:5a:04:31:10:a6
       width: 64 bits
       clock: 33MHz
       capabilities: pm msi pciexpress bus_master cap_list ethernet physical wireless
       configuration: broadcast=yes driver=rtl8192ce driverversion=4.4.0-170-generic firmware=N/A latency=0 link=no multicast=yes wireless=IEEE 802.11bgn
       resources: irq:16 ioport:e000(size=256) memory:f7e00000-f7e03fff
  *-network
       description: Ethernet interface
       product: RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller
       vendor: Realtek Semiconductor Co., Ltd.
       physical id: 0
       bus info: pci@0000:02:00.0
       logical name: eth0
       version: 0c
       serial: 80:ee:73:73:3e:51
       size: 1Gbit/s
       capacity: 1Gbit/s
       width: 64 bits
       clock: 33MHz
       capabilities: pm msi pciexpress msix vpd bus_master cap_list ethernet physical tp mii 10bt 10bt-fd 100bt 100bt-fd 1000bt 1000bt-fd autonegotiation
       configuration: autonegotiation=on broadcast=yes driver=r8169 driverversion=2.3LK-NAPI duplex=full firmware=rtl8168g-2_0.0.1 02/06/13 ip=90.146.207.78 latency=0 link=yes multicast=yes port=MII speed=1Gbit/s
       resources: irq:28 ioport:d000(size=256) memory:f7d00000-f7d00fff memory:f0000000-f0003fff

Code:

sudo leafpad /etc/resolv.conf


# Dynamic resolv.conf(5) file for glibc resolver(3) generated by resolvconf(8)
#     DO NOT EDIT THIS FILE BY HAND -- YOUR CHANGES WILL BE OVERWRITTEN
nameserver 127.0.1.1

**SeijiSensei** · December 19th, 2019

Somehow you are no longer connecting through your router. The address 90.146.207.78 is a public address from LIWEST Kabelmedien GmbH, Lindengasse 18, A-4040 Linz, Austria. You need to examine your wiring again and talk to your ISP. You certainly don't want to have a computer directly on the public Internet if you can avoid it, even one running Ubuntu which is pretty secure out-of-the-box.

**praseodym** · December 20th, 2019

Try reseting the router to factory settings

**istvan5** · December 21st, 2019

Hi !

Thank you for your replies. Problem solved.
I contacted ISP, resetting the router solved the issue.

I tried reset before, but it did not work, because for my router,
pressing and holding down for at least 30 seconds are needed for a reset.
I thought 3 seconds should be ok, as the lights on the router goes out
and come back again, but this is just a reboot. ISP reset my router remotely.

xx@Shuttle:~$ route -n
Kernel IP routing table
Destination Gateway Genmask Flags Metric Ref Use Iface
0.0.0.0 192.168.0.1 0.0.0.0 UG 100 0 0 eth0
192.168.0.0 0.0.0.0 255.255.255.0 U 100 0 0 eth0

Thank you!