Hi, Given in tcpdump there was no response at all (not even a rejection), my guess is there is a firewall on the OpenWrt host that drops all port 22 packets. Are firewall rules listed if you go "iptables -vnL" , or in a config file?
Cheers, Matt > On Tue 20/10/2020, at 1:50 pm, 许大仙 <xuyiwe...@gmail.com> wrote: > > Hi! > Sorry to disturb you. > I meet some problems when I try to connect to Dropbear Server of Openwrt. > So I really need your help. > > Here's the thing: > 1. I run QEMU with Openwrt(guest) for emulating an ARM system on ubuntu > 18.04(host). > Run the following commands on ubuntu 18.04: > qemu-system-aarch64 -net nic,vlan=0 -net nic,vlan=1 -net user,vlan=1 \ > -m 1024 -smp 2 -cpu cortex-a57 -M virt -nographic \ > -kernel openwrt-19.07.3-armvirt-64-Image-initramfs \ > -drive if=none,file=disk.img,format=raw,id=hd0 \ > -net user,host=10.0.2.10,hostfwd=tcp:127.0.0.1:10021-:22 \ > -net nic,model=e1000 > Details: https://openwrt.org/docs/guide-user/virtualization/qemu > <https://openwrt.org/docs/guide-user/virtualization/qemu>. > > 2. But I can not access dropbear of Openwrt through ssh in my host > machine——ubuntu 18.04. > SSH timeout: > <image.png> > Dropbear Service of Openwrt in QEMU: > <image.png> > > 3. I tried to use tcpdump to capture packages in Openwrt and found that > dropbear did not respond to any data packet received on port 22. > Captured packages: > <image.png> > > This is so strange. Could you give me some possible reasons? > Under what circumstances will Dropbear not reply to the packet? > > > Additional Information: > 1. Config of dropbear > <image.png> > 2. User Networking of QEMU > https://wiki.qemu.org/Documentation/Networking > <https://wiki.qemu.org/Documentation/Networking> > <image.png> >
