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Connect to RAS callback server: route problem

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Special Forums IP Networking Connect to RAS callback server: route problem
# 8  
Old 10-01-2007
I don't see pppd actually sending any packets down the wire.

what does "ifconfig ppp0" say?
# 9  
Old 10-01-2007
Code:
localhost ppp # ifconfig ppp0
ppp0      Link encap:Point-to-Point Protocol  
          inet addr:10.74.49.117  P-t-P:10.74.49.22  Mask:255.255.255.255
          UP POINTOPOINT RUNNING NOARP MULTICAST  MTU:1496  Metric:1
          RX packets:8 errors:0 dropped:0 overruns:0 frame:0
          TX packets:8 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:3 
          RX bytes:98 (98.0 b)  TX bytes:92 (92.0 b)

# 10  
Old 10-01-2007
Do the RX and TX counts go up when you ping or traceroute across the link?

Have you tried tcpdump or any other packet tracing?
# 11  
Old 10-01-2007
Oh yes. While I run the following ping, the command remains stuck but both TX and RX packets are increasing a lot:

Code:
localhost ppp # ping 10.74.49.22
PING 10.74.49.22 (10.74.49.22) 56(84) bytes of data.
^C
--- 10.74.49.22 ping statistics ---
247 packets transmitted, 0 received, 100% packet loss, time 246007ms

localhost ppp # ifconfig ppp0
ppp0      Link encap:Point-to-Point Protocol  
          inet addr:10.74.49.117  P-t-P:10.74.49.22  Mask:255.255.255.255
          UP POINTOPOINT RUNNING NOARP MULTICAST  MTU:1496  Metric:1
          RX packets:254 errors:0 dropped:0 overruns:0 frame:0
          TX packets:289 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:3 
          RX bytes:21051 (20.5 Kb)  TX bytes:23446 (22.8 Kb)

Also tcpdump shows me something, but I admit that I can't understand the output at all:

Code:
localhost ppp # tcpdump -i ppp0
tcpdump: verbose output suppressed, use -v or -vv for full protocol decode
listening on ppp0, link-type LINUX_SLL (Linux cooked), capture size 96 bytes
22:59:51.784268 IP 10.74.49.117 > 10.74.49.22: ICMP echo request, id 1303, seq 172, length 64
22:59:51.803173 IP 10.74.49.117.1072 > 212.216.112.112.domain: 16552+ PTR? 32.59.84.10.in-addr.arpa. (42)
22:59:52.784277 IP 10.74.49.117 > 10.74.49.22: ICMP echo request, id 1303, seq 173, length 64
22:59:53.784287 IP 10.74.49.117 > 10.74.49.22: ICMP echo request, id 1303, seq 174, length 64
22:59:54.784296 IP 10.74.49.117 > 10.74.49.22: ICMP echo request, id 1303, seq 175, length 64
22:59:55.784309 IP 10.74.49.117 > 10.74.49.22: ICMP echo request, id 1303, seq 176, length 64
22:59:56.784318 IP 10.74.49.117 > 10.74.49.22: ICMP echo request, id 1303, seq 177, length 64
22:59:56.804338 IP 10.74.49.117.1073 > 212.216.172.62.domain: 16552+ PTR? 32.59.84.10.in-addr.arpa. (42)

The IPs 212.216.112.112 and 212.216.172.62 are the DNS servers in my "/etc/resolv.conf" file, and are used only for the internet connection. To reach the remote machines behind RAS Server I'm using (for now!) a static hosts file or the direct IP address.
# 12  
Old 10-01-2007
1. what is at "32.59.84.10.in-addr.arpa", ie , 10.84.59.32? You seem to want the name of it.

2. Watch TCP dump while doing the following...

a. can you try "telnet <ras-server-ip> 135"

b. can you try "telnet <ras-server-ip> 137"

c. get the IP address of the true name server you are supposed to be using (not your /etc/resolv.conf internet one) and try using "nslookup lookup-name dns-server"

3. You are getting no ICMP echo replies back, can you ping when you are a Windows client? RAS server may have a firewall up.
# 13  
Old 10-02-2007
1. I don't know what 10.84.59.32 is. I've noticed that some output was written while some firefox extensions were trying to refresh their data and couldn't get it due to the internet temporary unavailable.

2. This is the tcpdump output, interleaved with the commands executed and their outputs:

Code:
localhost ppp # tcpdump -i ppp0
tcpdump: verbose output suppressed, use -v or -vv for full protocol decode
listening on ppp0, link-type LINUX_SLL (Linux cooked), capture size 96 bytes

===> a) telnet 10.74.49.22 135
===>    Trying 10.74.49.22... ^C After about a minute.
19:12:22.558271 IP 10.74.49.117.20558 > 10.74.49.22.epmap: S 2892706931:2892706931(0) win 5824 <mss 1456,sackOK,timestamp 230700 0,nop,wscale 7>
19:12:22.577869 IP 10.74.49.117.1108 > 212.216.112.112.domain: 482+ PTR? 22.49.74.10.in-addr.arpa. (42)
19:12:25.559651 IP 10.74.49.117.20558 > 10.74.49.22.epmap: S 2892706931:2892706931(0) win 5824 <mss 1456,sackOK,timestamp 231450 0,nop,wscale 7>

===> b) telnet 10.74.49.22 137
===>    Trying 10.74.49.22... ^C After about a minute.
19:12:27.579538 IP 10.74.49.117.1109 > 212.216.172.62.domain: 482+ PTR? 22.49.74.10.in-addr.arpa. (42)
19:12:31.559229 IP 10.74.49.117.20558 > 10.74.49.22.epmap: S 2892706931:2892706931(0) win 5824 <mss 1456,sackOK,timestamp 232950 0,nop,wscale 7>
19:12:32.579169 IP 10.74.49.117.1108 > 212.216.112.112.domain: 482+ PTR? 22.49.74.10.in-addr.arpa. (42)
19:12:37.578815 IP 10.74.49.117.1109 > 212.216.172.62.domain: 482+ PTR? 22.49.74.10.in-addr.arpa. (42)
19:12:42.597124 IP 10.74.49.117.1109 > 212.216.112.112.domain: 47546+ PTR? 117.49.74.10.in-addr.arpa. (43)
19:12:43.558381 IP 10.74.49.117.20558 > 10.74.49.22.epmap: S 2892706931:2892706931(0) win 5824 <mss 1456,sackOK,timestamp 235950 0,nop,wscale 7>
19:12:47.598123 IP 10.74.49.117.1110 > 212.216.172.62.domain: 47546+ PTR? 117.49.74.10.in-addr.arpa. (43)
19:12:52.597753 IP 10.74.49.117.1109 > 212.216.112.112.domain: 47546+ PTR? 117.49.74.10.in-addr.arpa. (43)
19:12:57.597400 IP 10.74.49.117.1110 > 212.216.172.62.domain: 47546+ PTR? 117.49.74.10.in-addr.arpa. (43)
19:13:02.615452 IP 10.74.49.117.1110 > 212.216.112.112.domain: 35246+ PTR? 112.112.216.212.in-addr.arpa. (46)
19:13:07.556689 IP 10.74.49.117.20558 > 10.74.49.22.epmap: S 2892706931:2892706931(0) win 5824 <mss 1456,sackOK,timestamp 241950 0,nop,wscale 7>
19:13:07.616720 IP 10.74.49.117.1111 > 212.216.172.62.domain: 35246+ PTR? 112.112.216.212.in-addr.arpa. (46)
19:13:12.616348 IP 10.74.49.117.1110 > 212.216.112.112.domain: 35246+ PTR? 112.112.216.212.in-addr.arpa. (46)
19:13:17.615996 IP 10.74.49.117.1111 > 212.216.172.62.domain: 35246+ PTR? 112.112.216.212.in-addr.arpa. (46)
19:13:22.634064 IP 10.74.49.117.1111 > 212.216.112.112.domain: 23012+ PTR? 62.172.216.212.in-addr.arpa. (45)
19:13:27.631300 IP 10.74.49.117.1112 > 212.216.172.62.domain: 23012+ PTR? 62.172.216.212.in-addr.arpa. (45)
19:13:32.630932 IP 10.74.49.117.1111 > 212.216.112.112.domain: 23012+ PTR? 62.172.216.212.in-addr.arpa. (45)
19:13:37.630579 IP 10.74.49.117.1112 > 212.216.172.62.domain: 23012+ PTR? 62.172.216.212.in-addr.arpa. (45)
19:13:44.019252 IP 10.74.49.117.4918 > 10.74.49.22.netbios-ns: S 2969828930:2969828930(0) win 5824 <mss 1456,sackOK,timestamp 251066 0,nop,wscale 7>
19:13:47.017902 IP 10.74.49.117.4918 > 10.74.49.22.netbios-ns: S 2969828930:2969828930(0) win 5824 <mss 1456,sackOK,timestamp 251816 0,nop,wscale 7>
19:13:53.017478 IP 10.74.49.117.4918 > 10.74.49.22.netbios-ns: S 2969828930:2969828930(0) win 5824 <mss 1456,sackOK,timestamp 253316 0,nop,wscale 7>
19:14:05.020633 IP 10.74.49.117.4918 > 10.74.49.22.netbios-ns: S 2969828930:2969828930(0) win 5824 <mss 1456,sackOK,timestamp 256316 0,nop,wscale 7>

===> c1) nslookup test1 10.68.25.1
===>     ;; connection timed out; no servers could be reached
19:15:05.767605 IP 10.74.49.117.1112 > d1y10001.domain: 26814+ A? test1.homenetwork. (37)
19:15:10.768021 IP 10.74.49.117.1112 > d1y10001.domain: 26814+ A? test1.homenetwork. (37)
19:15:15.771660 IP 10.74.49.117.1112 > d1y10001.domain: 26814+ A? test1.homenetwork. (37)

===> c2) nslookup test1 10.68.25.2
===>     ;; connection timed out; no servers could be reached
19:15:37.783807 IP 10.74.49.117.1112 > d2u10001.domain: 48180+ A? test1.homenetwork. (37)
19:15:42.785752 IP 10.74.49.117.1112 > d2u10001.domain: 48180+ A? test1.homenetwork. (37)
19:15:47.789400 IP 10.74.49.117.1112 > d2u10001.domain: 48180+ A? test1.homenetwork. (37)

31 packets captured
31 packets received by filter
0 packets dropped by kernel

3. Yes, from the Windows client I can ping successfully the server and any other machine on the network.
# 14  
Old 10-02-2007
1. play with your pppd options to get the simplest possible connection, you may need to research Windows RAS to Linux PPPD to find the best options.

2. get somebody sitting at the RAS server to tell you what is happening at their end.
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