ppp has same local and remote ip address

Forum: Linux
SeanH 
i manage to establish a ppp connection but have identical local and remote
ip addresses. i can ping www.google.com and traceroute www.google.com but
the connection is dropped when i try and use a web browser. thanks in
advance.

cat /var/log/messages:

Apr  5 21:51:41 FriendlyARM local2.info chat[989]: send (ATDT*99#^M)
Apr  5 21:51:41 FriendlyARM local2.info chat[989]: expect (CONNECT)
Apr  5 21:51:41 FriendlyARM local2.info chat[989]: ^M
Apr  5 21:51:41 FriendlyARM local2.info chat[989]: ^M
Apr  5 21:51:41 FriendlyARM local2.info chat[989]: CONNECT
Apr  5 21:51:41 FriendlyARM local2.info chat[989]:  -- got it
Apr  5 21:51:41 FriendlyARM local2.info chat[989]: send (\d)
Apr  5 21:51:42 FriendlyARM daemon.info pppd[987]: Serial connection
established.
Apr  5 21:51:42 FriendlyARM daemon.info pppd[987]: Using interface ppp0
Apr  5 21:51:42 FriendlyARM daemon.notice pppd[987]: Connect: ppp0 <-->
/dev/ttySAC1
Apr  5 21:51:44 FriendlyARM daemon.notice pppd[987]: local  IP address
41.119.235.100
Apr  5 21:51:44 FriendlyARM daemon.notice pppd[987]: remote IP address
41.119.235.100
Apr  5 21:51:44 FriendlyARM daemon.notice pppd[987]: primary   DNS address
209.212.96.1
Apr  5 21:51:44 FriendlyARM daemon.notice pppd[987]: secondary DNS address
209.212.97.1

SeanH 
cat /var/log/messages on termination looks as follows:

Apr  5 21:51:42 FriendlyARM daemon.info pppd[987]: Using interface ppp0
Apr  5 21:51:42 FriendlyARM daemon.notice pppd[987]: Connect: ppp0 <-->
/dev/ttySAC1
Apr  5 21:51:44 FriendlyARM daemon.notice pppd[987]: local  IP address
41.119.235.100
Apr  5 21:51:44 FriendlyARM daemon.notice pppd[987]: remote IP address
41.119.235.100
Apr  5 21:51:44 FriendlyARM daemon.notice pppd[987]: primary   DNS address
209.212.96.1
Apr  5 21:51:44 FriendlyARM daemon.notice pppd[987]: secondary DNS address
209.212.97.1
Apr  5 22:09:21 FriendlyARM daemon.info pppd[987]: LCP terminated by peer
(User request)
Apr  5 22:09:21 FriendlyARM daemon.info pppd[987]: Connect time 17.7
minutes.
Apr  5 22:09:21 FriendlyARM daemon.info pppd[987]: Sent 4624 bytes,
received 12475 bytes.
Apr  5 22:09:24 FriendlyARM daemon.notice pppd[987]: Connection terminated.
Apr  5 22:09:24 FriendlyARM local2.info chat[1017]: timeout set to 3
seconds
Apr  5 22:09:24 FriendlyARM local2.info chat[1017]: abort on (NO CARRIER)
Apr  5 22:09:24 FriendlyARM local2.info chat[1017]: send (\d+++\d)
Apr  5 22:09:26 FriendlyARM local2.info chat[1017]: expect (OK)

Mark Lakata 
I had the same problem. The symptom was actually that the connection would
disconnect and drop back to the AT command mode, which would cause PPPD to
complain that it was receiving it's own echos. (AT mode locally echos
everything).

I traced it to the fact that the local and remote IP addresses were the
same.

I fixed it by added "noipdefault" to the pppd options. Now the local and
mote IP are different (remote is actually defaulting to 10.64.64.64, but I
think the remote IP address is irrelevant -- as long as it isn't the same
as the local IP).

Note: I don't have this problem with my Verizon modem, just my AT&T modem.