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diff --git a/khashmir/const.py b/khashmir/const.py
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+# The contents of this file are subject to the BitTorrent Open Source License
+# Version 1.1 (the License).  You may not copy or use this file, in either
+# source code or executable form, except in compliance with the License.  You
+# may obtain a copy of the License at http://www.bittorrent.com/license/.
+#
+# Software distributed under the License is distributed on an AS IS basis,
+# WITHOUT WARRANTY OF ANY KIND, either express or implied.  See the License
+# for the specific language governing rights and limitations under the
+# License.
+
+# magic id to use before we know a peer's id
+NULL_ID =  20 * '\0'
+
+# Kademlia "K" constant, this should be an even number
+K = 8
+
+# SHA1 is 160 bits long
+HASH_LENGTH = 160
+
+# checkpoint every this many seconds
+CHECKPOINT_INTERVAL = 60 * 5 # five minutes
+
+# how often to find our own nodes
+FIND_CLOSE_INTERVAL = 60 * 15 # fifteen minutes
+
+### SEARCHING/STORING
+# concurrent krpc calls per find node/value request!
+CONCURRENT_REQS = K
+
+# how many hosts to post to
+STORE_REDUNDANCY = 3
+
+
+###  ROUTING TABLE STUFF
+# how many times in a row a node can fail to respond before it's booted from the routing table
+MAX_FAILURES = 3
+
+# never ping a node more often than this
+MIN_PING_INTERVAL = 60 * 15 # fifteen minutes
+
+# refresh buckets that haven't been touched in this long
+BUCKET_STALENESS = 60 * 15 # fifteen minutes
+
+
+###  KEY EXPIRER
+# time before expirer starts running
+KEINITIAL_DELAY = 15 # 15 seconds - to clean out old stuff in persistent db
+
+# time between expirer runs
+KE_DELAY = 60 * 5 # 5 minutes
+
+# expire entries older than this
+KE_AGE = 60 * 30 # 30 minutes
+
+
+## krpc errback codes
+KRPC_TIMEOUT = 20
+
+KRPC_ERROR = 1
+KRPC_ERROR_METHOD_UNKNOWN = 2
+KRPC_ERROR_RECEIVED_UNKNOWN = 3
+KRPC_ERROR_TIMEOUT = 4
+KRPC_SOCKET_ERROR = 5
+
+KRPC_CONNECTION_CACHE_TIME = KRPC_TIMEOUT * 2
+
+
+## krpc erorr response codes
+KERR_ERROR = (201, "Generic Error")
+KERR_SERVER_ERROR = (202, "Server Error")
+KERR_PROTOCOL_ERROR = (203, "Protocol Error")
+KERR_METHOD_UNKNOWN = (204, "Method Unknown")
+KERR_INVALID_ARGS = (205, "Invalid Argements")
+KERR_INVALID_TOKEN = (206, "Invalid Token")