[nos-bbs] JNOS axudp to BPQ on the same host?
Darin Franklin
KE0NUC at pobox.com
Mon Sep 7 01:57:38 EDT 2020
I am running JNOS 2.0m.4 on a Raspberry Pi (Buster), and I want to connect with axudp to a local instance of BPQ (LinBPQ 6.0.20.1), running on the same host. Ultimately, I want to connect to a remote BPQ host over the Internet, but I am doing this first for troubleshooting. I think that my problems are related to the routing for tun0.
When I use 192.168.2.1 (the tun0 address) for the "bpq" interface, then I am able to connect from JNOS to BPQ.
attach axudp bpq 256 192.168.2.1 KE0NUC-3 10092 10092
jnos> c bpq KE0NUC-3
Trying KE0NUC-3 on port bpq...
AX25 session 1 connected to KE0NUC-3
::: KE0NUC-3 BPQ Node
If I use 192.168.1.102 (the RPi host address), then I cannot connect to BPQ.
attach axudp bpq 256 192.168.1.102 KE0NUC-3 10092 10092
jnos> c bpq KE0NUC-3
Trying KE0NUC-3 on port bpq...
(wait forever...)
How do I get this second case to work?
Here is my network configuration inside JNOS.
jnos> route
Destination Len Interface Gateway Metric PD Timer Use
default 0 tun0 1 man 0
jnos> ifconfig
bpq IP addr 192.168.2.2 MTU 256 Link encap AX25
Link addr KE0NUC-3 BBS KE0NUC-9 Paclen 256 Irtt 5000
AXIP dest 192.168.1.102
flags 0xcb0 trace 0x0 netmask 0x00000000 broadcast 0.0.0.0
sent: ip 0 tot 0 idle 0:00:00:21
recv: ip 0 tot 0 idle 0:00:00:21
tun0 IP addr 192.168.2.2 MTU 1500 Link encap TUN
flags 0x0 trace 0x0 netmask 0x00000255 broadcast 0.0.0.0
sent: ip 0 tot 0 idle 0:00:00:21
recv: ip 3 tot 3 idle 0:00:00:09
loopback IP addr 127.0.0.1 MTU 65535 Link encap None
flags 0x0 trace 0x0 netmask 0xffffffff broadcast 255.255.255.255
sent: ip 0 tot 0 idle 0:00:00:21
recv: ip 0 tot 0 idle 0:00:00:21
encap IP addr 0.0.0.0 MTU 65535 Link encap None
flags 0x0 trace 0x0 netmask 0xffffffff broadcast 255.255.255.255
sent: ip 0 tot 0 idle 0:00:00:21
recv: ip 0 tot 0 idle 0:00:00:21
Here is my Linux host configuration.
% 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 303 0 0 wlan0
192.168.1.0 0.0.0.0 255.255.255.0 U 303 0 0 wlan0
192.168.2.2 0.0.0.0 255.255.255.255 UH 0 0 0 tun0
% ifconfig
enxb827eb3e3f22: flags=4099<UP,BROADCAST,MULTICAST> mtu 1500
ether b8:27:eb:3e:3f:22 txqueuelen 1000 (Ethernet)
RX packets 0 bytes 0 (0.0 B)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 0 bytes 0 (0.0 B)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
lo: flags=73<UP,LOOPBACK,RUNNING> mtu 65536
inet 127.0.0.1 netmask 255.0.0.0
inet6 ::1 prefixlen 128 scopeid 0x10<host>
loop txqueuelen 1000 (Local Loopback)
RX packets 18 bytes 1354 (1.3 KiB)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 18 bytes 1354 (1.3 KiB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
tun0: flags=4305<UP,POINTOPOINT,RUNNING,NOARP,MULTICAST> mtu 1500
inet 192.168.2.1 netmask 255.255.255.255 destination 192.168.2.2
inet6 fe80::f4e4:f9ab:a069:295e prefixlen 64 scopeid 0x20<link>
unspec 00-00-00-00-00-00-00-00-00-00-00-00-00-00-00-00 txqueuelen 500 (UNSPEC)
RX packets 0 bytes 0 (0.0 B)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 5 bytes 240 (240.0 B)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
wlan0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500
inet 192.168.1.102 netmask 255.255.255.0 broadcast 192.168.1.255
inet6 fe80::a907:7d27:45f8:3b7c prefixlen 64 scopeid 0x20<link>
ether b8:27:eb:6b:6a:77 txqueuelen 1000 (Ethernet)
RX packets 4407 bytes 306384 (299.2 KiB)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 3698 bytes 1211310 (1.1 MiB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
autoexec.nos:
log on
hostname KE0NUC
ax25 mycall KE0NUC-1
ax25 bbscall KE0NUC-9
ip address 192.168.2.2
attach tun tun0 1500 0
shell ifconfig tun0 192.168.2.1 pointopoint 192.168.2.2 mtu 1500 up
ifconfig tun0 ipaddress 192.168.2.2
ifconfig tun0 netmask 255.255.255.0
ifconfig tun0 mtu 1500
attach axudp bpq 256 192.168.1.102 KE0NUC-3 10092 10092
#attach axudp bpq 256 192.168.2.1 KE0NUC-3 10092 10092
start ax25
start telnet
bpq32.cfg:
SIMPLE
NODECALL=KE0NUC-3
LOCATOR EN13
CTEXT:
::: KE0NUC-3 BPQ Node
***
PORT
ID=axudp
DRIVER=BPQAXIP
MAXFRAME=1
CONFIG
UDP 10092
MAP KE0NUC 0.0.0.0 UDP 10092 B
ENDPORT
I do have ip_forward enabled.
% cat /proc/sys/net/ipv4/ip_forward
1
Here is what I see when I try to connect.
% sudo tcpdump -i tun0 -n -vvv -u port 10092
tcpdump: listening on tun0, link-type RAW (Raw IP), capture size 262144 bytes
00:26:43.049772 IP (tos 0x0, ttl 254, id 49, offset 0, flags [none], proto UDP (17), length 45)
192.168.2.2.10092 > 192.168.1.102.10092: [udp sum ok] UDP, length 17
00:26:43.170969 IP (tos 0x0, ttl 64, id 33956, offset 0, flags [DF], proto UDP (17), length 45)
192.168.2.1.10092 > 192.168.2.2.10092: [udp sum ok] UDP, length 17
00:26:43.271933 IP (tos 0x0, ttl 64, id 33957, offset 0, flags [DF], proto UDP (17), length 69)
192.168.2.1.10092 > 192.168.2.2.10092: [udp sum ok] UDP, length 41
00:26:53.134874 IP (tos 0x0, ttl 254, id 50, offset 0, flags [none], proto UDP (17), length 45)
192.168.2.2.10092 > 192.168.1.102.10092: [udp sum ok] UDP, length 17
00:26:53.308508 IP (tos 0x0, ttl 64, id 34238, offset 0, flags [DF], proto UDP (17), length 45)
192.168.2.1.10092 > 192.168.2.2.10092: [udp sum ok] UDP, length 17
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