No connection between simulAVR and gdb

问题

I'm trying to connect gdb to a running simulavr session. The commands used are:

simulavr -d atmega328 -f tiny.elf -B main -g

after which I get the message:

Waiting on port 1212 for gdb client to connect...

On sending ^C, I get:

^CSystemClock::Endless stopped
number of cpu cycles simulated: 909726536

which seems to be encouraging. When I try to connect to that session using gdb I get:

(gdb) file tiny.elf
Reading symbols from tiny.elf...done.
(gdb) target remote localhost:1212
localhost:1212: Connection timed out.       (This is after about 2')

Monitoring localhost, I see connection requests (SYN) being sent, but no reply from simulavr

Not sure if this is supposed to work, but I also tried to connect to simulavr with netcat - no luck either.

Anyone with ideas how to debug/solve this? Could this be a problem of the firewall?

EDIT: ifconfig lo show activity though:

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 25540  bytes 2149477 (2.0 MiB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 25540  bytes 2149477 (2.0 MiB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

Also, 127.0.0.1 is defined in /etc/hosts

EDIT2: This is the output of iptables -L -n

Chain INPUT (policy DROP)
target     prot opt source               destination         
ACCEPT     all  --  0.0.0.0/0            0.0.0.0/0           
ACCEPT     all  --  0.0.0.0/0            0.0.0.0/0           
ACCEPT     all  --  0.0.0.0/0            0.0.0.0/0            state RELATED,ESTABLISHED
ACCEPT     all  --  10.0.0.2             0.0.0.0/0           
ACCEPT     tcp  --  0.0.0.0/0            0.0.0.0/0            tcp dpt:631
ACCEPT     tcp  --  0.0.0.0/0            0.0.0.0/0            tcp dpt:3000

Chain FORWARD (policy ACCEPT)
target     prot opt source               destination         

Chain OUTPUT (policy ACCEPT)
target     prot opt source               destination

来源：https://stackoverflow.com/questions/51317961/no-connection-between-simulavr-and-gdb

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gdb

remote-debugging

avr