Hello,
I have the following test scenario and 2 questions based on it that I
would like some clarity on please:
dsl_router<------>pppoe_concentrator<-------->host
Q1:
Should I be able to ping the concentrator pppoe "default gateway"?
Q2:
(elaborated further down below) Should there not be 3 capitalized P's in
the output of the "npppctl session all"?
After the dsl_router obtains an IP address from the pppoe_concentrator,
I cannot ping from the dsl_router to the pppoe_concentrator although
the host behind the concentrator does ping fine.
The concentrator has ip forwarding turned on, and a tcpdump shows no
icmp coming in on the pppx0 interface, but does show icmp coming from
the dsl_router on the em0 interface.
The pppoe_concentrator also has pf disabled for the purpose of testing.
On the dsl_router:
yassers@dsl_router:[~] $ sysctl | grep forwarding
net.inet.ip.forwarding=0
net.inet.ip.mforwarding=0
net.inet6.ip6.forwarding=0
net.inet6.ip6.mforwarding=0
yassers@dsl_router:[~] $ netstat -rnaf inet
Routing tables
Internet:
Destination Gateway Flags Refs Use Mtu Prio
Iface
default 10.0.0.1 UGS 0 56 - 8
pppoe0
10.0.0.1 10.0.0.101 UH 0 0 - 4
pppoe0
10.0.0.101 127.0.0.1 UHl 0 0 - 1
lo0
127/8 127.0.0.1 UGRS 0 0 32768 8
lo0
127.0.0.1 127.0.0.1 UH 1 0 32768 4
lo0
192.168.56/24 link#2 UC 3 0 - 4
em1
192.168.56.1 0a:00:27:00:00:00 UHLc 1 143 - 4
em1
192.168.56.100 08:00:27:47:47:e6 UHLc 1 1 - 4
em1
192.168.56.102 08:00:27:7a:48:8a UHLc 0 1 - 4
em1
192.168.56.110 08:00:27:05:00:bd UHLl 0 0 - 1
lo0
224/4 127.0.0.1 URS 0 0 32768 8
lo0
yassers@dsl_router:[~] $ uname -a
OpenBSD dsl_router 5.6 GENERIC#310 amd64
yassers@dsl_router:[~] $ ifconfig
lo0: flags=8049<UP,LOOPBACK,RUNNING,MULTICAST> mtu 32768
priority: 0
groups: lo
inet6 ::1 prefixlen 128
inet6 fe80::1%lo0 prefixlen 64 scopeid 0x4
inet 127.0.0.1 netmask 0xff000000
em0: flags=28843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST,NOINET6> mtu
1500
lladdr 08:00:27:f2:ff:72
priority: 0
media: Ethernet autoselect (1000baseT full-duplex)
status: active
em1: flags=28843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST,NOINET6> mtu
1500
lladdr 08:00:27:05:00:bd
priority: 0
media: Ethernet autoselect (1000baseT full-duplex)
status: active
inet 192.168.56.110 netmask 0xffffff00 broadcast 192.168.56.255
enc0: flags=20000<NOINET6>
priority: 0
groups: enc
status: active
pppoe0: flags=28851<UP,POINTOPOINT,RUNNING,SIMPLEX,MULTICAST,NOINET6>
mtu 1492
priority: 0
dev: em0 state: session
sid: 0xff88 PADI retries: 0 PADR retries: 0 time: 00:14:20
sppp: phase network authproto chap
groups: pppoe egress
status: active
inet 10.0.0.101 --> 10.0.0.1 netmask 0xffffffff
pflog0: flags=20141<UP,RUNNING,PROMISC,NOINET6> mtu 33144
priority: 0
groups: pflog
yassers@dsl_router:[~] $
ping failures from dsl_router:
yassers@dsl_router:[~] $ ping 10.0.0.1
PING 10.0.0.1 (10.0.0.1): 56 data bytes
--- 10.0.0.1 ping statistics ---
113 packets transmitted, 0 packets received, 100.0% packet loss
yassers@dsl_router:[~] $
corresponding tcpdumps on pppoe_concentrator:
# tcpdump -ni pppx0
tcpdump: listening on pppx0, link-type LOOP
^C
0 packets received by filter
0 packets dropped by kernel
# tcpdump -ni em0
tcpdump: listening on em0, link-type EN10MB
05:44:39.986289 PPPoE-Session
code Session, version 1, type 1, id 0xa88c, length 86
tcpdump: WARNING: compensating for unaligned libpcap packets
IP: 10.0.0.101 > 10.0.0.1: icmp: echo request
05:44:40.996252 PPPoE-Session
code Session, version 1, type 1, id 0xa88c, length 86
IP: 10.0.0.101 > 10.0.0.1: icmp: echo request
05:44:42.005899 PPPoE-Session
code Session, version 1, type 1, id 0xa88c, length 86
IP: 10.0.0.101 > 10.0.0.1: icmp: echo request
^C
4 packets received by filter
0 packets dropped by kernel
# pfctl -d
pfctl: pf not enabled
# npppctl session all
Ppp Id = 0
Ppp Id : 0
Username : yassers
Realm Name : LOCAL
Concentrated Interface : pppx0
Assigned IPv4 Address : 10.0.0.101
Tunnel Protocol : PPPoE
Tunnel From : 08:00:27:f2:ff:72
Start Time : 2015/05/07 05:38:10
Elapsed Time : 1514 sec (25 minutes)
Input Bytes : 864
Input Packets : 82
Input Errors : 0 (0.0%)
Output Bytes : 8935 (8.7 KB)
Output Packets : 131
Output Errors : 0 (0.0%)
based on ppp(4), and especially this snippet:
When the peer starts to talk in PPP, ppp detects this automatically and
returns to command mode.
ppp ON awfulhak> # No link has been established
Ppp ON awfulhak> # We've connected & finished
LCP
PPp ON awfulhak> # We've authenticated
PPP ON awfulhak> # We've agreed IP numbers
Can I assume that there are 2 phases that still need to happen with the
output of 'npppctl session all'? (only 1 capitalized "P")
