Re: bin/44032: pppd: proxyarp is not working

[Egervary Gergely <gergely%egervary.hu@localhost>]

> | A year has passed, and it seems we still do not have proxyarp working
> | properly.
> |
> | I'm now running on todays 5.1_STABLE.
> |
> | [10.0.0.192]---ppp---[10.0.0.1]---ethernet---[10.0.0.2]
> |
> | - pppd on 10.0.0.1 says:
> |    pppd[1291]: found interface vlan10 for proxy arp
> |    (looks okay)
> |       
> | - 10.0.0.192 can ping 10.0.0.1, but not 10.0.0.2 and vice versa
> |
> | - on 10.0.0.1:
> |    # arp 10.0.0.192
> |    arp: 10.0.0.192 (10.0.0.192) -- no entry
> |
> |    # arp -s 10.0.0.192 00:11:22:33:44:55 pub
> |    arp: set: proxy entry exists for non 802 device
> |
> | - on 10.0.0.2:
> |    # arp 10.0.0.192
> |    arp: 10.0.0.192 (10.0.0.192) -- no entry
> |
> |    # tcpdump -i vlan10
> |    00:17:47.028819 ARP, Request who-has 10.0.0.192 tell 10.0.0.2,
> |    length 28
> |    00:17:48.036521 ARP, Request who-has 10.0.0.192 tell 10.0.0.2,
> |    length 28
> |    ...
> |
> | Any ideas?
>
> Can you put some debugging in sifproxyarp and see what's going on?

Finally, I have done some debugging.

- In sifproxyarp(), arpmsg.hwa contains the correct MAC address.
- Socket write() succeeds with 112 bytes written, that looks good.
- If I comment out the socket write(), and manually enter the
arp entry (arp -s 10.0.0.192 <mac> pub proxy) then the kernel still
does not respond to arp who-has requests.

Now, some questions:

- The proxy arp entries are not visible in `arp -a'. Should not they
be visible? For example, on Linux they are visible.

- Once I add an arp entry with `arp -s 10.0.0.192 <mac> pub proxy'
I cannot remove it later. (arp: delete: can't locate 10.0.0.192)
Is this normal?

- Is proxy arp working good for somebody out there? Could you please
test it?

Thank you.
--
Gergely EGERVARY