No se puede usar el reenvío de IP en Android a menos que el punto de acceso esté activado

No se puede usar el reenvío de IP en Android a menos que el punto de acceso esté activado

Realmente estancado en esto, quiero cambiar la puerta de enlace de mi PC para que mi teléfono esté conectado a la misma red wifi en mi casa. Cuando el punto de acceso está activado y me conecto con otro dispositivo, funciona como se esperaba. Cuando desactivo el punto de acceso y cambio la puerta de enlace de mi PC al teléfono y habilito el reenvío, los contadores en la tabla FORWARD de iptables no cambian.

He habilitado todo el reenvío de puertos que utiliza el hotspot. Consulte el resultado de sysctl a continuación.

La IP de la computadora es 192.168.0.57

El teléfono/tableta a través del cual estoy intentando conectarme es un Samsung Galaxy TAB A6 que actualmente ejecuta una rom personalizada de linaje. Android 9 tampoco tuvo éxito con la imagen de archivo 8.1.

Ejecutar ping 8.8.8.8 desde la pc da estos resultados:

La respuesta tcpdump cuando el punto de acceso está activado

06:55:33.500227 IP 19.18.39.197 > dns.google: ICMP echo request, id 21730, seq 1, length 64
06:55:33.528039 IP dns.google > 19.18.39.197: ICMP echo reply, id 21730, seq 1, length 64
06:55:34.578520 IP 19.18.39.197 > dns.google: ICMP echo request, id 21731, seq 1, length 64
06:55:34.603065 IP dns.google > 19.18.39.197: ICMP echo reply, id 21731, seq 1, length 64
06:55:35.717137 IP 19.18.39.197 > dns.google: ICMP echo request, id 21732, seq 1, length 64
06:55:35.763043 IP dns.google > 19.18.39.197: ICMP echo reply, id 21732, seq 1, length 64

La respuesta de tcpdump sin el hotspot

06:58:16.566254 IP 19.18.39.197 > 192.168.0.57: ICMP net cache2.service.virginmedia.net unreachable, 
length 68

que sigue repitiéndose

ifconfig and ip r:

:/ # ip r
19.0.0.0/8 dev rmnet1 proto kernel scope link src 19.18.39.197
192.168.0.0/24 dev wlan0 proto kernel scope link src 192.168.0.50
:/ # ifconfig
wlan0     Link encap:Ethernet  HWaddr 08:78:08:ac:fc:04  Driver ar6k_wlan
          inet addr:192.168.0.50  Bcast:192.168.0.255  Mask:255.255.255.0
          inet6 addr: fe80::a78:8ff:feac:fc04/64 Scope: Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:5876 errors:0 dropped:0 overruns:0 frame:0
          TX packets:3845 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:3000
          RX bytes:935863 TX bytes:580125

rmnet1    Link encap:Point-to-Point Protocol
          inet addr:19.18.39.197  P-t-P:19.18.39.197  Mask:255.0.0.0
          UP POINTOPOINT RUNNING NOARP MULTICAST  MTU:1500  Metric:1
          RX packets:3351 errors:0 dropped:0 overruns:0 frame:0
          TX packets:3383 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:1564260 TX bytes:1053730

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:5435 errors:0 dropped:0 overruns:0 frame:0
          TX packets:5435 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:869529 TX bytes:869529

iptables: nada cambia en la cadena directa con el punto de acceso desactivado

:/ # iptables -vnL
Chain INPUT (policy ACCEPT 6542 packets, 1282K bytes)
 pkts bytes target     prot opt in     out     source               destination

Chain FORWARD (policy ACCEPT 1666 packets, 346K bytes)
 pkts bytes target     prot opt in     out     source               destination

Chain OUTPUT (policy ACCEPT 6514 packets, 925K bytes)
 pkts bytes target     prot opt in     out     source               destination

:/ # iptables -t nat -vnL
Chain PREROUTING (policy ACCEPT 3072 packets, 203K bytes)
pkts bytes target     prot opt in     out     source               destination

Chain INPUT (policy ACCEPT 2074 packets, 126K bytes)
pkts bytes target     prot opt in     out     source               destination

Chain OUTPUT (policy ACCEPT 199 packets, 13593 bytes)
pkts bytes target     prot opt in     out     source               destination

Chain POSTROUTING (policy ACCEPT 62 packets, 4337 bytes)
pkts bytes target     prot opt in     out     source               destination
710 58824 MASQUERADE  all  --  *      rmnet1  0.0.0.0/0            0.0.0.0/0

Sysctl (Estos se deshabilitan cuando apagas el punto de acceso y los vuelvo a habilitar)

  :/ # sysctl -a |grep forward
    net.ipv4.conf.all.forwarding = 1
    net.ipv4.conf.all.mc_forwarding = 0
    net.ipv4.conf.default.forwarding = 1
    net.ipv4.conf.default.mc_forwarding = 0
    net.ipv4.conf.ip6tnl0.forwarding = 1
    net.ipv4.conf.ip6tnl0.mc_forwarding = 0
    net.ipv4.conf.lo.forwarding = 1
    net.ipv4.conf.lo.mc_forwarding = 0
    net.ipv4.conf.rmnet0.forwarding = 1
    net.ipv4.conf.rmnet0.mc_forwarding = 0
    net.ipv4.conf.rmnet1.forwarding = 1
    net.ipv4.conf.rmnet1.mc_forwarding = 0
    net.ipv4.conf.rmnet2.forwarding = 1
    net.ipv4.conf.rmnet2.mc_forwarding = 0
    net.ipv4.conf.rmnet3.forwarding = 1
    net.ipv4.conf.rmnet3.mc_forwarding = 0
    net.ipv4.conf.rmnet4.forwarding = 1
    net.ipv4.conf.rmnet4.mc_forwarding = 0
    net.ipv4.conf.rmnet5.forwarding = 1
    net.ipv4.conf.rmnet5.mc_forwarding = 0
    net.ipv4.conf.rmnet6.forwarding = 1
    net.ipv4.conf.rmnet6.mc_forwarding = 0
    net.ipv4.conf.rmnet7.forwarding = 1
    net.ipv4.conf.rmnet7.mc_forwarding = 0
    net.ipv4.conf.sit0.forwarding = 1
    net.ipv4.conf.sit0.mc_forwarding = 0
    net.ipv4.conf.umts_dm0.forwarding = 1
    net.ipv4.conf.umts_dm0.mc_forwarding = 0
    net.ipv4.conf.wlan0.forwarding = 1
    net.ipv4.conf.wlan0.mc_forwarding = 0
    net.ipv4.ip_forward = 1
    net.ipv4.ip_forward_use_pmtu = 0
    sysctl: key 'net.ipv4.route.flush': Permission denied
    net.ipv6.conf.all.forwarding = 1
    net.ipv6.conf.default.forwarding = 1
    net.ipv6.conf.ip6tnl0.forwarding = 1
    net.ipv6.conf.lo.forwarding = 1
    net.ipv6.conf.rmnet0.forwarding = 1
    net.ipv6.conf.rmnet1.forwarding = 1
    net.ipv6.conf.rmnet2.forwarding = 1
    net.ipv6.conf.rmnet3.forwarding = 1
    net.ipv6.conf.rmnet4.forwarding = 1
    net.ipv6.conf.rmnet5.forwarding = 1
    net.ipv6.conf.rmnet6.forwarding = 1
    net.ipv6.conf.rmnet7.forwarding = 1
    net.ipv6.conf.sit0.forwarding = 1
    net.ipv6.conf.umts_dm0.forwarding = 1
    net.ipv6.conf.wlan0.forwarding = 1

¿Parece que el punto de acceso está cambiando una opción que no sé cuándo se activa y que permite el reenvío con la esperanza de que alguien tenga una idea?

EDITAR

Gracias a la ayuda de AB, este problema se debió a que Android creó reglas de IP cuando el punto de acceso estaba activado y que no estaba replicando cuando el punto de acceso estaba apagado.

Como se solicitó aquí, las mesas están primero con el punto de acceso desactivado.

:/ # ip link
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN mode DEFAULT group default
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
2: umts_dm0: <POINTOPOINT,MULTICAST,NOARP> mtu 1500 qdisc noop state DOWN mode DEFAULT group default qlen 1000
    link/ppp
3: rmnet0: <POINTOPOINT,MULTICAST,NOARP> mtu 1500 qdisc noop state DOWN mode DEFAULT group default qlen 1000
    link/ppp
4: rmnet1: <POINTOPOINT,MULTICAST,NOARP,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UNKNOWN mode DEFAULT group default qlen 1000
    link/ppp
5: rmnet2: <POINTOPOINT,MULTICAST,NOARP> mtu 1500 qdisc noop state DOWN mode DEFAULT group default qlen 1000
    link/ppp
6: rmnet3: <POINTOPOINT,MULTICAST,NOARP> mtu 1500 qdisc noop state DOWN mode DEFAULT group default qlen 1000
    link/ppp
7: rmnet4: <POINTOPOINT,MULTICAST,NOARP> mtu 1500 qdisc noop state DOWN mode DEFAULT group default qlen 1000
    link/ppp
8: rmnet5: <POINTOPOINT,MULTICAST,NOARP> mtu 1500 qdisc noop state DOWN mode DEFAULT group default qlen 1000
    link/ppp
9: rmnet6: <POINTOPOINT,MULTICAST,NOARP> mtu 1500 qdisc noop state DOWN mode DEFAULT group default qlen 1000
    link/ppp
10: rmnet7: <POINTOPOINT,MULTICAST,NOARP> mtu 1500 qdisc noop state DOWN mode DEFAULT group default qlen 1000
    link/ppp
11: sit0@NONE: <NOARP> mtu 1480 qdisc noop state DOWN mode DEFAULT group default
    link/sit 0.0.0.0 brd 0.0.0.0
12: ip6tnl0@NONE: <NOARP> mtu 1452 qdisc noop state DOWN mode DEFAULT group default
    link/tunnel6 :: brd ::
13: wlan0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state UP mode DORMANT group default qlen 3000
    link/ether 08:78:08:ac:fc:04 brd ff:ff:ff:ff:ff:ff
14: p2p0: <BROADCAST,MULTICAST> mtu 1500 qdisc noop state DOWN mode DEFAULT group default qlen 3000
    link/ether 0a:78:08:ac:fc:04 brd ff:ff:ff:ff:ff:ff

1|:/ # ip address
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
    inet 127.0.0.1/8 scope host lo
       valid_lft forever preferred_lft forever
    inet6 ::1/128 scope host
       valid_lft forever preferred_lft forever
2: umts_dm0: <POINTOPOINT,MULTICAST,NOARP> mtu 1500 qdisc noop state DOWN group default qlen 1000
    link/ppp
3: rmnet0: <POINTOPOINT,MULTICAST,NOARP> mtu 1500 qdisc noop state DOWN group default qlen 1000
    link/ppp
4: rmnet1: <POINTOPOINT,MULTICAST,NOARP,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UNKNOWN group default qlen 1000
    link/ppp
    inet 19.18.242.148/8 scope global rmnet1
       valid_lft forever preferred_lft forever
5: rmnet2: <POINTOPOINT,MULTICAST,NOARP> mtu 1500 qdisc noop state DOWN group default qlen 1000
    link/ppp
6: rmnet3: <POINTOPOINT,MULTICAST,NOARP> mtu 1500 qdisc noop state DOWN group default qlen 1000
    link/ppp
7: rmnet4: <POINTOPOINT,MULTICAST,NOARP> mtu 1500 qdisc noop state DOWN group default qlen 1000
    link/ppp
8: rmnet5: <POINTOPOINT,MULTICAST,NOARP> mtu 1500 qdisc noop state DOWN group default qlen 1000
    link/ppp
9: rmnet6: <POINTOPOINT,MULTICAST,NOARP> mtu 1500 qdisc noop state DOWN group default qlen 1000
    link/ppp
10: rmnet7: <POINTOPOINT,MULTICAST,NOARP> mtu 1500 qdisc noop state DOWN group default qlen 1000
    link/ppp
11: sit0@NONE: <NOARP> mtu 1480 qdisc noop state DOWN group default
    link/sit 0.0.0.0 brd 0.0.0.0
12: ip6tnl0@NONE: <NOARP> mtu 1452 qdisc noop state DOWN group default
    link/tunnel6 :: brd ::
13: wlan0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state UP group default qlen 3000
    link/ether 08:78:08:ac:fc:04 brd ff:ff:ff:ff:ff:ff
    inet 192.168.0.50/24 brd 192.168.0.255 scope global wlan0
       valid_lft forever preferred_lft forever
    inet6 fe80::a78:8ff:feac:fc04/64 scope link
       valid_lft forever preferred_lft forever
14: p2p0: <BROADCAST,MULTICAST> mtu 1500 qdisc noop state DOWN group default qlen 3000
    link/ether 0a:78:08:ac:fc:04 brd ff:ff:ff:ff:ff:ff

130|:/ # ip route
19.0.0.0/8 dev rmnet1 proto kernel scope link src 19.18.242.148
192.168.0.0/24 dev wlan0 proto kernel scope link src 192.168.0.50
:/ # ip rule
0:      from all lookup local
10000:  from all fwmark 0xc0000/0xd0000 lookup legacy_system
10500:  from all iif lo oif wlan0 uidrange 0-0 lookup wlan0
10500:  from all iif lo oif rmnet1 uidrange 0-0 lookup rmnet1
13000:  from all fwmark 0x10063/0x1ffff iif lo lookup local_network
13000:  from all fwmark 0x10065/0x1ffff iif lo lookup wlan0
13000:  from all fwmark 0x50064/0x5ffff iif lo lookup rmnet1
14000:  from all iif lo oif wlan0 lookup wlan0
14000:  from all fwmark 0x40000/0x40000 iif lo oif rmnet1 lookup rmnet1
15000:  from all fwmark 0x0/0x10000 lookup legacy_system
16000:  from all fwmark 0x0/0x10000 lookup legacy_network
17000:  from all fwmark 0x0/0x10000 lookup local_network
19000:  from all fwmark 0x65/0x1ffff iif lo lookup wlan0
22000:  from all fwmark 0x0/0xffff iif lo lookup wlan0
32000:  from all unreachable
:/ #
1|:/ # ip rule show table local
0:      from all lookup local
:/ # ip rule show table rmnet1
10500:  from all iif lo oif rmnet1 uidrange 0-0 lookup rmnet1
13000:  from all fwmark 0x50064/0x5ffff iif lo lookup rmnet1
14000:  from all fwmark 0x40000/0x40000 iif lo oif rmnet1 lookup rmnet1
:/ # ip rule show table wlan0
10500:  from all iif lo oif wlan0 uidrange 0-0 lookup wlan0
13000:  from all fwmark 0x10065/0x1ffff iif lo lookup wlan0
14000:  from all iif lo oif wlan0 lookup wlan0
19000:  from all fwmark 0x65/0x1ffff iif lo lookup wlan0
22000:  from all fwmark 0x0/0xffff iif lo lookup wlan0
:/ # ip rule show table local_network
13000:  from all fwmark 0x10063/0x1ffff iif lo lookup local_network
17000:  from all fwmark 0x0/0x10000 lookup local_network
:/ # ip rule show table legacy_network
16000:  from all fwmark 0x0/0x10000 lookup legacy_network
:/ # ip rule show table legacy_system
10000:  from all fwmark 0xc0000/0xd0000 lookup legacy_system
15000:  from all fwmark 0x0/0x10000 lookup legacy_system
:/ #
:/ # ip route show table local
broadcast 19.0.0.0 dev rmnet1 proto kernel scope link src 19.18.242.148
local 19.18.242.148 dev rmnet1 proto kernel scope host src 19.18.242.148
broadcast 19.255.255.255 dev rmnet1 proto kernel scope link src 19.18.242.148
broadcast 127.0.0.0 dev lo proto kernel scope link src 127.0.0.1
local 127.0.0.0/8 dev lo proto kernel scope host src 127.0.0.1
local 127.0.0.1 dev lo proto kernel scope host src 127.0.0.1
broadcast 127.255.255.255 dev lo proto kernel scope link src 127.0.0.1
broadcast 192.168.0.0 dev wlan0 proto kernel scope link src 192.168.0.50
local 192.168.0.50 dev wlan0 proto kernel scope host src 192.168.0.50
broadcast 192.168.0.255 dev wlan0 proto kernel scope link src 192.168.0.50
:/ # ip route show table rmnet1
default via 19.18.242.1 dev rmnet1 proto static
19.18.242.1 dev rmnet1 proto static scope link
19.18.242.148 dev rmnet1 proto static scope link
:/ # ip route show table wlan0
default via 192.168.0.1 dev wlan0 proto static
192.168.0.0/24 dev wlan0 proto static scope link
:/ # ip route show table local_network
:/ # ip route show table legacy_network
:/ # ip route show table legacy_system
:/ #

Y con el hotspot encendido

:/ # ip link
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN mode DEFAULT group default
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
2: umts_dm0: <POINTOPOINT,MULTICAST,NOARP> mtu 1500 qdisc noop state DOWN mode DEFAULT group default qlen 1000
    link/ppp
3: rmnet0: <POINTOPOINT,MULTICAST,NOARP> mtu 1500 qdisc pfifo_fast state DOWN mode DEFAULT group default qlen 1000
    link/ppp
4: rmnet1: <POINTOPOINT,MULTICAST,NOARP,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UNKNOWN mode DEFAULT group default qlen 1000
    link/ppp
5: rmnet2: <POINTOPOINT,MULTICAST,NOARP> mtu 1500 qdisc noop state DOWN mode DEFAULT group default qlen 1000
    link/ppp
6: rmnet3: <POINTOPOINT,MULTICAST,NOARP> mtu 1500 qdisc noop state DOWN mode DEFAULT group default qlen 1000
    link/ppp
7: rmnet4: <POINTOPOINT,MULTICAST,NOARP> mtu 1500 qdisc noop state DOWN mode DEFAULT group default qlen 1000
    link/ppp
8: rmnet5: <POINTOPOINT,MULTICAST,NOARP> mtu 1500 qdisc noop state DOWN mode DEFAULT group default qlen 1000
    link/ppp
9: rmnet6: <POINTOPOINT,MULTICAST,NOARP> mtu 1500 qdisc noop state DOWN mode DEFAULT group default qlen 1000
    link/ppp
10: rmnet7: <POINTOPOINT,MULTICAST,NOARP> mtu 1500 qdisc noop state DOWN mode DEFAULT group default qlen 1000
    link/ppp
11: sit0@NONE: <NOARP> mtu 1480 qdisc noop state DOWN mode DEFAULT group default
    link/sit 0.0.0.0 brd 0.0.0.0
12: ip6tnl0@NONE: <NOARP> mtu 1452 qdisc noop state DOWN mode DEFAULT group default
    link/tunnel6 :: brd ::
13: wlan0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state UP mode DEFAULT group default qlen 3000
    link/ether 08:78:08:ac:fc:04 brd ff:ff:ff:ff:ff:ff
:/ #
:/ # ip address
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
    inet 127.0.0.1/8 scope host lo
       valid_lft forever preferred_lft forever
    inet6 ::1/128 scope host
       valid_lft forever preferred_lft forever
2: umts_dm0: <POINTOPOINT,MULTICAST,NOARP> mtu 1500 qdisc noop state DOWN group default qlen 1000
    link/ppp
3: rmnet0: <POINTOPOINT,MULTICAST,NOARP> mtu 1500 qdisc pfifo_fast state DOWN group default qlen 1000
    link/ppp
4: rmnet1: <POINTOPOINT,MULTICAST,NOARP,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UNKNOWN group default qlen 1000
    link/ppp
    inet 19.18.242.148/8 scope global rmnet1
       valid_lft forever preferred_lft forever
5: rmnet2: <POINTOPOINT,MULTICAST,NOARP> mtu 1500 qdisc noop state DOWN group default qlen 1000
    link/ppp
6: rmnet3: <POINTOPOINT,MULTICAST,NOARP> mtu 1500 qdisc noop state DOWN group default qlen 1000
    link/ppp
7: rmnet4: <POINTOPOINT,MULTICAST,NOARP> mtu 1500 qdisc noop state DOWN group default qlen 1000
    link/ppp
8: rmnet5: <POINTOPOINT,MULTICAST,NOARP> mtu 1500 qdisc noop state DOWN group default qlen 1000
    link/ppp
9: rmnet6: <POINTOPOINT,MULTICAST,NOARP> mtu 1500 qdisc noop state DOWN group default qlen 1000
    link/ppp
10: rmnet7: <POINTOPOINT,MULTICAST,NOARP> mtu 1500 qdisc noop state DOWN group default qlen 1000
    link/ppp
11: sit0@NONE: <NOARP> mtu 1480 qdisc noop state DOWN group default
    link/sit 0.0.0.0 brd 0.0.0.0
12: ip6tnl0@NONE: <NOARP> mtu 1452 qdisc noop state DOWN group default
    link/tunnel6 :: brd ::
13: wlan0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state UP group default qlen 3000
    link/ether 08:78:08:ac:fc:04 brd ff:ff:ff:ff:ff:ff
    inet 192.168.43.241/24 brd 192.168.43.255 scope global wlan0
       valid_lft forever preferred_lft forever
    inet6 fe80::a78:8ff:feac:fc04/64 scope link
       valid_lft forever preferred_lft forever
:/ #
:/ # ip route
19.0.0.0/8 dev rmnet1 proto kernel scope link src 19.18.242.148
192.168.43.0/24 dev wlan0 proto kernel scope link src 192.168.43.241
:/ # ip rule
0:      from all lookup local
10000:  from all fwmark 0xc0000/0xd0000 lookup legacy_system
10500:  from all iif lo oif rmnet1 uidrange 0-0 lookup rmnet1
10500:  from all iif lo oif wlan0 uidrange 0-0 lookup local_network
13000:  from all fwmark 0x10063/0x1ffff iif lo lookup local_network
13000:  from all fwmark 0x10064/0x1ffff iif lo lookup rmnet1
14000:  from all iif lo oif rmnet1 lookup rmnet1
14000:  from all iif lo oif wlan0 lookup local_network
15000:  from all fwmark 0x0/0x10000 lookup legacy_system
16000:  from all fwmark 0x0/0x10000 lookup legacy_network
17000:  from all fwmark 0x0/0x10000 lookup local_network
18000:  from all iif wlan0 lookup rmnet1
19000:  from all fwmark 0x64/0x1ffff iif lo lookup rmnet1
22000:  from all fwmark 0x0/0xffff iif lo lookup rmnet1
32000:  from all unreachable
:/ # ip rule show table local
0:      from all lookup local
:/ # ip rule show table rmnet1
10500:  from all iif lo oif rmnet1 uidrange 0-0 lookup rmnet1
13000:  from all fwmark 0x10064/0x1ffff iif lo lookup rmnet1
14000:  from all iif lo oif rmnet1 lookup rmnet1
18000:  from all iif wlan0 lookup rmnet1
19000:  from all fwmark 0x64/0x1ffff iif lo lookup rmnet1
22000:  from all fwmark 0x0/0xffff iif lo lookup rmnet1
:/ # ip rule show table wlan0
Error: argument "wlan0" is wrong: table id value is invalid

255|:/ # ip rule show table local_network
10500:  from all iif lo oif wlan0 uidrange 0-0 lookup local_network
13000:  from all fwmark 0x10063/0x1ffff iif lo lookup local_network
14000:  from all iif lo oif wlan0 lookup local_network
17000:  from all fwmark 0x0/0x10000 lookup local_network
:/ # ip rule show table legacy_network
16000:  from all fwmark 0x0/0x10000 lookup legacy_network
:/ # ip rule show table legacy_system
10000:  from all fwmark 0xc0000/0xd0000 lookup legacy_system
15000:  from all fwmark 0x0/0x10000 lookup legacy_system
:/ #
:/ # ip route show table local
broadcast 19.0.0.0 dev rmnet1 proto kernel scope link src 19.18.242.148
local 19.18.242.148 dev rmnet1 proto kernel scope host src 19.18.242.148
broadcast 19.255.255.255 dev rmnet1 proto kernel scope link src 19.18.242.148
broadcast 127.0.0.0 dev lo proto kernel scope link src 127.0.0.1
local 127.0.0.0/8 dev lo proto kernel scope host src 127.0.0.1
local 127.0.0.1 dev lo proto kernel scope host src 127.0.0.1
broadcast 127.255.255.255 dev lo proto kernel scope link src 127.0.0.1
broadcast 192.168.43.0 dev wlan0 proto kernel scope link src 192.168.43.241
local 192.168.43.241 dev wlan0 proto kernel scope host src 192.168.43.241
broadcast 192.168.43.255 dev wlan0 proto kernel scope link src 192.168.43.241
:/ # ip route show table rmnet1
default via 19.18.242.1 dev rmnet1 proto static
19.18.242.1 dev rmnet1 proto static scope link
19.18.242.148 dev rmnet1 proto static scope link
:/ # ip route show table wlan0
Error: argument "wlan0" is wrong: table id value is invalid

255|:/ # ip route show table local_network
192.168.43.0/24 dev wlan0 proto static scope link
:/ # ip route show table legacy_network
:/ # ip route show table legacy_system
:/ #

Creo que puedo hacer que funcione eliminando todo y simplificando, pero creo que Android simplemente recreará las reglas con un cambio de red, así que quiero resolver la regla que he pasado por alto.

EDITAR

Todo resuelto. El punto de acceso agrega enrutamiento entre las dos interfaces que falta cuando el punto de acceso se desconecta. Solo necesito volver a agregar estas 2 reglas:

:/ # ip rule add from all iif rmnet1 lookup wlan0
:/ # ip rule add from all iif wlan0 lookup rmnet1

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