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Date: Tue, 6 Jan 1998 18:06:44 -0500
From: Randall Hopper <rhh@ct.picker.com>
To: Brian Somers <brian@awfulhak.org>
Cc: questions@freebsd.org
Subject: Re: User PPP: Not getting return IP packets (?)
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(Sorry it's been so long since my original post.  Got side tracked into
other things over the holidays.)


Brian Somers <brian@awfulhak.org>:
 |>      Trying to set up ppp for my holiday ISP here.  It appears ppp connects
 |> ok and negotiates, interfaces are configed, routing tables set up, ...but
 |> after it's all done, IP packets sent out (such as ping) don't generate any
 |> response from the other end.
 |>
 ...
 |> 09:03:21: tun0: IPCP: IpcpLayerUp(9).
 |> 09:03:21: tun0: IPCP:  myaddr = 206.175.52.124  hisaddr = 205.156.197.250
 ...
 |> <ping commands executed here>
 |>
 |> 09:03:49: tun0: Command: quit
 |> 09:03:49: tun0: IPCP: OsLinkdown: 205.156.197.250
 |> 09:03:49: tun0: IPCP: IpcpLayerDown.
 |> 09:03:49: tun0: IPCP: Connect time: 28 secs: 0 octets in, 0 octets out
 |> 09:03:49: tun0: IPCP:  total 0 bytes/sec
 |
 |Hmmm, no IP sent or received.

That was farther up in the logs -- included above.  The 09:03:49 lines you
Cced are the beginning of the shutdown sequence.

 |But wait.... your ppp.linkup does include a MYADDR section with it in
 |:-(

Right.  As I mentioned, tun0 gets configed and the correct routes get
added.  ping request packets get sent across the modem link (confirmed with
tcpdump).  The only hitch is no IP packets (e.g. ping responses) ever get
sent back from the other side.

It's like the other side either 1) doesn't like something about my IP
packets, or 2) doesn't think the PPP link is fully up yet.

 |If the latest ppp doesn't come up with any interesting errors, post
 |the output of `netstat -rn' at the time of the pings.

I listed this in the 'netstat.out' attachments.  Here's another copy.
Everything looks good.  ppp added both of the tun0 routes.

# netstat -rn                                                   Routing tables

Internet:
Destination        Gateway            Flags     Refs     Use     Netif Expire
default            205.156.197.250    UGSc        0        0      tun0
127.0.0.1          127.0.0.1          UH          2       31       lo0
192.168.40         link#1             UC          0        0
192.168.40.1       0:40:33:2d:d7:15   UHLW        1     1957       ed0   1043
205.156.197.250    206.175.52.124     UH          1        0      tun0


Randall Hopper