diff --git a/pimd/DEBUG b/pimd/DEBUG
new file mode 100644
index 0000000..aeed9da
--- /dev/null
+++ b/pimd/DEBUG
@@ -0,0 +1,49 @@
+# $QuaggaId: $Format:%an, %ai, %h$ $
+
+DEBUG HINTS
+
+  - Check the source is issuing multicast packets with TTL high enough
+    to reach the recipients.
+
+  - Check the multicast packets are not being dropped due to
+    fragmentation problems.
+
+  - The following command generates a 100-kbps multicast stream for
+    channel 1.1.1.1,239.1.1.1 with TTL 10 and 1000-byte payload per UDP
+    packet (to avoid fragmentation):
+
+    nepim -b 1.1.1.1 -c 239.1.1.1 -T 10 -W 1000 -r 100k -a 1d
+
+  - Remotely you can receive that stream by running:
+
+    nepim -j 1.1.1.1+239.1.1.1@eth0
+    (Remember of enabling both "ip pim ssm" and "ip igmp" under eth0.)
+
+
+SAMPLE DEBUG COMMANDS
+
+  conf t
+   int eth0
+    ip pim ssm
+
+  test pim receive hello eth0 192.168.0.2 600 10 111 1000 3000 0
+  test pim receive join eth0 600 192.168.0.1 192.168.0.2 239.1.1.1 1.1.1.1
+
+  show ip pim join                                                         
+
+
+INTEROPERABILITY WITH CISCO
+
+  ! Cisco IP Multicast command reference:
+  ! ftp://ftpeng.cisco.com/ipmulticast/Multicast-Commands
+  !
+  ip pim ssm default ! enable SSM mode for groups 232.0.0.0/8
+  ip multicast-routing
+  ip pim state-refresh disable
+  no ip pim dm-fallback
+  !
+  interface FastEthernet0
+   ip pim sparse-mode
+   ip igmp version 3
+
+-x-