On both wired and wireless connections, I can only access one of 192.168.1.1 (the router web portal) and the general Internet.  Which "mode" my devices are in is seemingly random.  This has persisted so far for 5 days (since I began using this network).

When connected to the Internet, I can go to 192.168.102.1 and I see a landing page for "mikrotik routeros", but I cannot go to 192.168.1.1. When connected to the router but not the Internet, 192.168.1.1 yields the router web portal, and 192.168.102.1 is inaccessible.

Attempted solutions


Upgrading router firmware  
Resetting router to factory settings  
Rebooting devices  
Fiddling with router settings (changing wireless security modes, removing wireless security, etc)  
Upgrading wireless drivers on computers  


Some data


Affects BlackBerry, Windows, Android and Ubuntu devices
All devices work properly on other networks
Devices may switch modes if they have been offline for a long time (eg: overnight), but restarting a device has no effect
Router is TP-Link TL-WR740N v4
Router firmware DD-WRT v24-sp2 (04/18/14) std - build 23919
Both wired and wireless connections are affected, but not necessarily simultaneously


I don't know anything about networking, but here's some info that seems helpful taken from my Ubuntu laptop.

With internet access (wired in this case, but it varies):

~ $ route -n
Kernel IP routing table
Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
0.0.0.0         192.168.102.1   0.0.0.0         UG    0      0        0 eth0
192.168.102.0   0.0.0.0         255.255.254.0   U     1      0        0 eth0

~ $ ifconfig
eth0      Link encap:Ethernet  HWaddr 54:ee:75:0c:02:80  
          inet addr:192.168.103.232  Bcast:192.168.103.255  Mask:255.255.254.0
          inet6 addr: fe80::56ee:75ff:fe0c:280/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:3273 errors:0 dropped:0 overruns:0 frame:0
          TX packets:3035 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000 
          RX bytes:2276482 (2.2 MB)  TX bytes:517732 (517.7 KB)
          Interrupt:20 Memory:f0500000-f0520000 

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:4315 errors:0 dropped:0 overruns:0 frame:0
          TX packets:4315 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0 
          RX bytes:342880 (342.8 KB)  TX bytes:342880 (342.8 KB)


With "router access" (wireless in this case, but it varies):

~ $ route -n
Kernel IP routing table
Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
0.0.0.0         192.168.1.1     0.0.0.0         UG    0      0        0 wlan0
192.168.1.0     0.0.0.0         255.255.255.0   U     9      0        0 wlan0

~ $ ifconfig
eth0      Link encap:Ethernet  HWaddr 54:ee:75:0c:02:80  
          UP BROADCAST MULTICAST  MTU:1500  Metric:1
          RX packets:9422 errors:0 dropped:0 overruns:0 frame:0
          TX packets:7545 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000 
          RX bytes:6216683 (6.2 MB)  TX bytes:1399280 (1.3 MB)
          Interrupt:20 Memory:f0500000-f0520000 

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:4446 errors:0 dropped:0 overruns:0 frame:0
          TX packets:4446 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0 
          RX bytes:353415 (353.4 KB)  TX bytes:353415 (353.4 KB)

wlan0     Link encap:Ethernet  HWaddr e8:2a:ea:60:31:4b  
          inet addr:192.168.1.105  Bcast:192.168.1.255  Mask:255.255.255.0
          inet6 addr: fe80::ea2a:eaff:fe60:314b/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:77013 errors:0 dropped:0 overruns:0 frame:0
          TX packets:49506 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000 
          RX bytes:25275438 (25.2 MB)  TX bytes:30355132 (30.3 MB)


With both (wired with wireless turned on):

~ $ route -n
Kernel IP routing table
Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
0.0.0.0         192.168.102.1   0.0.0.0         UG    0      0        0 eth0
192.168.1.0     0.0.0.0         255.255.255.0   U     9      0        0 wlan0
192.168.102.0   0.0.0.0         255.255.254.0   U     1      0        0 eth0



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