Hello dear list,
I'm using snmptrapd and get link up/down from a Nortel Networks switch:
The snmptrapd logs the traps in the logfile. But sometime, the value
from the MAC-Address is misinterpreted (as string, eg. "`s\\/c(")
In the network capture from tcpdump, the bytecode from a working trap
and a not working trap looks like the same, except the bytes from the
MAC itself.
Working trap:
10.32.12.240(via UDP: [10.32.12.240]:4682->[10.216.17.90]) TRAP, SNMP
v1, community public#012#011.1.3.6.1.4.1.45.1.6.2.1 Enterprise
Specific Trap (5) Uptime:
48:17:31:03.16#012#011.1.3.6.1.4.1.45.1.6.5.3.12.1.1.1.2 =
1#011.1.3.6.1.4.1.45.1.6.5.3.12.1.2.1.2 =
2#011.1.3.6.1.4.1.45.1.6.5.3.12.1.3.1.2 = "50 26 90 9E 66 44 "
Not working trap with wrong interpreted MAC:
10.22.2.240 (via UDP: [10.22.2.240]:2925->[10.216.17.90]) TRAP, SNMP
v1, community public#012#011.1.3.6.1.4.1.45.1.6.2.1 Enterprise
Specific Trap (5) Uptime:
33:21:06:58.47#012#011.1.3.6.1.4.1.45.1.6.5.3.12.1.1.1.22 =
1#011.1.3.6.1.4.1.45.1.6.5.3.12.1.2.1.22 =
22#011.1.3.6.1.4.1.45.1.6.5.3.12.1.3.1.22 = "`s\\/c("
I straced the snmptrapd while recvmsg:
recvmsg(8, {msg_name(16)={sa_family=AF_INET, sin_port=htons(3705),
sin_addr=inet_addr("10.22.2.240")},
msg_iov(1)=[{"0t\2\1\0\4\6public\244g\6\n+\6\1\4\1-\1\6\2\1@\4\n\26\2\360\2\1\6\2\1\5C\4\21\201\\V0G0\24\6\17+\6\1\4\1-\1\6\5\3\f\1\1\1\26\2\1\0010\24\6\17+\6\1\4\1-\1\6\5\3\f\1\2\1\26\2\1\0260\31\6\17+\6\1\4\1-\1\6\5\3\f\1\3\1\26\4\6`s\\/c(\5\21\1\5\4\0\4\6\0\37<\262\205w\1\1\3\1\2\1\1\1\3\201\23\2\1\23\0
I also installed the needed MIBs in /usr/share/snmp/mibs
- S5-ROOT-MIB.mib
- SYNOPTICS-ROOT-MIB.mib
and started the snmptrapd with -m ALL. But nothing changed (I used
strace -f -e open to exterminate, if the MIBs are loaded).
With this MIBs, I can use
snmptranslate -m ALL .1.3.6.1.4.1.45.1.6.2.1
S5-ROOT-MIB::s5EthTrap
What is going wrong, does anyone has a clue?
Thanks, Meike
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