The broadcast going out on ax25 looks good, at least. I can trace
these packets in the agw, and they look right. But, those packets
sent on Windows 0.0.0.0 to 255.255.255.255 end up in a black hole
somewhere when they come over ax25. Becuase my test
code will see packets from the local machine going to 255.255.255.255
but the ones that the Win dhcp client sends just don't show up in
the same code.
Unfortunately, to test 'normal broadcast' packets, I need to dig up my
Visual C++ CD, and make some test code there. Unless someone
has a simple win32 based utility for sending out udp test packets?
Hmm?
-----Original Message-----
From: Cathryn Mataga <[EMAIL PROTECTED]>
To: [EMAIL PROTECTED] <[EMAIL PROTECTED]>
Date: Saturday, October 23, 1999 12:08 AM
Subject: Re: dhcpd + sv2agw
>Thanks for the pointer. Well, this patch does allow me to get the
>BROADCAST flag and address set. Except this still doesn't allow
>me to receive the broadcasts -- like you said. Or, at least I dhcpd
>doesn't work. I probably need to cook up a simpler test program
>than dhcpd.
>
>
>Btw, in mkiss.c, I think these two constants are wrong.
>
>
> static char ax25_bcast[AX25_ADDR_LEN] =
> {'Q'<<1,'S'<<1,'T'<<1,' '<<1,' '<<1,' '<<1,'0'<<1};
> static char ax25_test[AX25_ADDR_LEN] =
> {'L'<<1,'I'<<1,'N'<<1,'U'<<1,'X'<<1,' '<<1,'1'<<1};
>
>I think they should be 0 instead of '0', if ax25_addr is the
>final source on what is the correct format -- right? But, then
>how did Arp ever work? This is right, I think...
>
> static char ax25_bcast[AX25_ADDR_LEN] =
> {'Q'<<1,'S'<<1,'T'<<1,' '<<1,' '<<1,' '<<1,0<<1};
> static char ax25_test[AX25_ADDR_LEN] =
> {'L'<<1,'I'<<1,'N'<<1,'U'<<1,'X'<<1,' '<<1,1<<1};
>
>I was all fired up, about maybe this being the problem, but
>then still dhcpd doesn't work. Though I now have some other
>things to try again.
>
>Maybe it would be better to call asc2ax here -- hmm?
>
>
>>>
>>> I'm also still trying to figure out the BROADCAST flag, and whether
>>> this is necessary. My ethernet card shows a Bcast:XX.XX.XX.XX
>>> address and the BROADCAST flag in ifconfig, but none of my ax25
>>> ports do. Why doesn't /sbin/ifconfig ax2 broadcast turn this on?
>>
>>Broadcast operation seems to be broken, at least on those ax25 ports
>>supported via KISS. I ran into this problem some time back when trying
>>to get gated to work over the air. It is likely that the same problem is
>>keeping dhcp from working.
>>
>>Part of the problem is that the mkiss code is not setting the flag that tells
>>the rest of the system that it is capable of doing broadcasts. This all used
>>to work, but seems to have been broken sometime around the 2.2 kernel
>>release. From what I can tell, the networking code used to assume that
>>broadcast was supported, despite the flag not being set.
>>
>>The following code change will set the broadcast flag and allow ifconfig
>>to set the broadcast address.
>>
>>WARNING, while this won't break anything, I can't be sure it will fix the
>>dhcp problem either. It partially fixed my problems with gated, but I still
>>have problems receiving broadcasts, thus it's probably only part of the
>>problem. Offered in the hope it will fix your problem or at least point you
>>in the direction of a fix. My time has been limited lately and I haven't been
>>able to take this any farther.
>>
>>--
>>Make the following mod to the file /usr/src/linux/drivers/net/hamradio/mkiss.c
>>and recompile the kernal and modules.
>>
>>At line 1031 change the entry for
>> dev->flags = 0;
>>to
>> dev->flags = 0x2;
>>
>>ifconfig will now show the BROADCAST field and allow you to modify it.
>>Programs that check for broadcast capability (like gated and dhcpd) should
>>now attempt to use ax25 ports as well.
>>
>>
>>--
>>Let me know if this helps.
>>
>>Ken, N7IPB
>>[EMAIL PROTECTED] - TCP/IP packet radio in the Pacific Northwest
