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Tips for local testing guestfwd


From: Felix Wu
Subject: Tips for local testing guestfwd
Date: Sun, 25 Jun 2023 22:58:36 -0700

Hi all,

TL,DR: I am working on QEMU ipv6 guestfwd feature and finished coding, and would like to learn the best practice to test it.
Context: in slirp side this task is tracking by [1].
Currently, I have done following:
i. made char parse + guestfwd functions happy with ipv6 address.
ii. enabled debug print and made sure the ip and port are inserted into the forward list in libslirp.
To sufficiently verify it's working, I do have three questions:
1. I want to forward a port in the guest (OS in QEMU) to a port 22 on the host OS, and ssh from guest back to host,
does this sound reasonable? If this is not a good idea, what method is recommended?
2. I want to understand what ip I should use. Currently I have following formats for the QEMU invocation in ipv6:
```
guestfwd=tcp:[::1]:1234-tcp:[my:host:ip:from:ifconfig]:22
```
I know the general form is `guestfwd=tcp:server:port-dev`, where server:port is for guest, dev is for host.
Adding [] in my implementation will let QEMU know it's ipv6.  
Is the aforementioned invocation correct? Or in this case [::1] is the local host address and I should put qemu address
for it instead?
3. Is there a default ipv6 address for QEMU instance? I think I need it in the invocation.

Thanks in advance! Felix

[1]. https://gitlab.freedesktop.org/slirp/libslirp/-/issues/67

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