grep pptp /var/log/syslog
........
Jan  2 23:24:55 gateway pptp[3313]: anon log[decaps_gre:pptp_gre.c:407]: buffering packet 199964 (expecting 199963, lost or reordered)
Jan  2 23:24:55 gateway pptp[3313]: anon log[decaps_gre:pptp_gre.c:407]: buffering packet 199965 (expecting 199963, lost or reordered)
Jan  2 23:24:55 gateway pptp[3313]: anon log[decaps_gre:pptp_gre.c:407]: buffering packet 199966 (expecting 199963, lost or reordered)
Jan  2 23:24:55 gateway pptp[3313]: anon log[decaps_gre:pptp_gre.c:407]: buffering packet 199967 (expecting 199963, lost or reordered)
Jan  2 23:24:55 gateway pptp[3313]: anon log[decaps_gre:pptp_gre.c:407]: buffering packet 199968 (expecting 199963, lost or reordered)
Jan  2 23:24:55 gateway pptp[3313]: anon log[decaps_gre:pptp_gre.c:407]: buffering packet 199969 (expecting 199963, lost or reordered)
Jan  2 23:24:55 gateway pptp[3313]: anon log[decaps_gre:pptp_gre.c:407]: buffering packet 199970 (expecting 199963, lost or reordered)
Jan  2 23:24:56 gateway pptp[3313]: anon log[decaps_gre:pptp_gre.c:407]: buffering packet 200008 (expecting 200007, lost or reordered)
Jan  2 23:24:56 gateway pptp[3313]: anon log[decaps_gre:pptp_gre.c:407]: buffering packet 200009 (expecting 200007, lost or reordered)
Jan  2 23:24:56 gateway pptp[3313]: anon log[decaps_gre:pptp_gre.c:407]: buffering packet 200010 (expecting 200007, lost or reordered)
Jan  2 23:24:56 gateway pptp[3313]: anon log[decaps_gre:pptp_gre.c:407]: buffering packet 200011 (expecting 200007, lost or reordered)
Jan  2 23:24:56 gateway pptp[3313]: anon log[decaps_gre:pptp_gre.c:407]: buffering packet 200012 (expecting 200007, lost or reordered)
Jan  2 23:24:56 gateway pptp[3313]: anon log[decaps_gre:pptp_gre.c:407]: buffering packet 200013 (expecting 200007, lost or reordered)
Jan  2 23:24:56 gateway pptp[3313]: anon log[decaps_gre:pptp_gre.c:407]: buffering packet 200014 (expecting 200007, lost or reordered)

......
Jan  2 23:40:22 gateway pptp[8504]: anon log[decaps_gre:pptp_gre.c:407]: accepting packet 4514 (expecting 4509, lost or reordered)
Jan  2 23:40:22 gateway pptp[8504]: anon log[decaps_gre:pptp_gre.c:407]: accepting packet 4528 (expecting 4521, lost or reordered)
Jan  2 23:40:22 gateway pptp[8504]: anon log[decaps_gre:pptp_gre.c:407]: accepting packet 4558 (expecting 4556, lost or reordered)
Jan  2 23:40:23 gateway pptp[8504]: anon log[decaps_gre:pptp_gre.c:407]: accepting packet 4579 (expecting 4570, lost or reordered)
Jan  2 23:40:23 gateway pptp[8504]: anon log[decaps_gre:pptp_gre.c:407]: accepting packet 4618 (expecting 4615, lost or reordered)
Jan  2 23:40:23 gateway pptp[8504]: anon log[decaps_gre:pptp_gre.c:407]: accepting packet 4629 (expecting 4628, lost or reordered)
.......

Jan  3 00:01:48 gateway pptp[8504]: rx accepted  = 13214
Jan  3 00:01:48 gateway pptp[8504]: rx lost      = -274
Jan  3 00:01:48 gateway pptp[8504]: rx under win = 0
Jan  3 00:01:48 gateway pptp[8504]: rx over  win = 0
Jan  3 00:01:48 gateway pptp[8504]: rx buffered  = 274
Jan  3 00:01:48 gateway pptp[8504]: rx OS errors = 0
Jan  3 00:01:48 gateway pptp[8504]: rx truncated = 0
Jan  3 00:01:48 gateway pptp[8504]: rx invalid   = 0
Jan  3 00:01:48 gateway pptp[8504]: rx acks      = 0
Jan  3 00:01:48 gateway pptp[8504]: tx sent      = 11579
Jan  3 00:01:48 gateway pptp[8504]: tx failed    = 0
Jan  3 00:01:48 gateway pptp[8504]: tx short     = 0
Jan  3 00:01:48 gateway pptp[8504]: tx acks      = 341
Jan  3 00:01:48 gateway pptp[8504]: tx oversize  = 0
Jan  3 00:01:48 gateway pptp[8504]: round trip   = 188437 usecs

# /sbin/ifconfig
eth1      Link encap:Ethernet  Hardware Adresse 00:e0:7d:8a:81:ce
          inet Adresse:10.0.0.140  Bcast:10.0.0.255  Maske:255.255.255.0
          inet6-Adresse: fe80::2e0:7dff:fe8a:81ce/64 Gültigkeitsbereich:Verbindung
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metrik:1
          RX packets:511291 errors:0 dropped:0 overruns:0 frame:0
          TX packets:237366 errors:0 dropped:0 overruns:0 carrier:0
          Kollisionen:65724 Sendewarteschlangenlänge:1000
          RX bytes:353124098 (336.7 MiB)  TX bytes:33520119 (31.9 MiB)
          Interrupt:20 Basisadresse:0x3800

gateway:/etc/ppp# ping -c 3000 -s 4096 -f 10.0.0.138
PING 10.0.0.138 (10.0.0.138) 4096(4124) bytes of data.

--- 10.0.0.138 ping statistics ---
3000 packets transmitted, 3000 received, 0% packet loss, time 25107ms
rtt min/avg/max/mdev = 8.227/8.327/18.716/0.416 ms, pipe 2, ipg/ewma 8.372/8.302 ms


gateway:/etc/ppp# ping -c 3000  -f 10.0.0.138
PING 10.0.0.138 (10.0.0.138) 56(84) bytes of data.

--- 10.0.0.138 ping statistics ---
3000 packets transmitted, 3000 received, 0% packet loss, time 2073ms
rtt min/avg/max/mdev = 0.627/0.654/1.664/0.042 ms, ipg/ewma 0.691/0.649 ms