I'm looking at two audio channels: SendAudio and ReceiveAudio coming from a WebRTC call. For each respectively, we can see the following metrics:
AudioSend
----------
packetsLost
packetsSent
AudioReceive
----------
packetsLost
packetsReceived
My question is, what is the correct equation to calculate the packet loss for each? Are the 'lost' packets included in the packetsSent/packetsReceived?
For example, packet loss as a percent for two WebRTC events could be defined as:
AudioSend Packet Loss as a Percent
currentEvent.packetsLost - previousEvent.packetsLost
--------------------------------------------------------------------------------------------------------------
(currentEvent.packetsSent + currentEvent.packetsLost) - (previousEvent.packetsSent - previousEvent.packetsLost)
Note: we need two events as packetsLost and packetsSent are both running sums (so we need the delta between two events).
This would be the case if the lost packets are NOT included in the packetsSent value (i.e. they would have to be added for to sum the total amount of packets that were SUPPOSE to be sent).
From Igor's input:
AudioSend Packet Loss as a Percent
packetsLost
----------- * 100
packetsSent
AudioReceived Packet Loss as a Percent
packetsLost
----------------------------- * 100
packetsReceived + packetsLost
PacketsLost is not included in the packetsReceived, but included in packetsSent. PacketsSent = packetsReceived + packetsLost + packetsDuplicated. PacketsDuplicated will be discarded by the receiver. So I suppose you want to calculate audio quality based on the packets loss, I think you should use bit rate as audio quality.
const lastTotalBytesReceived = lastScanResult.totalBytes;
const currentTotalBytesReceived = currentScanResult.bytesReceived;
lastScanResult.totalBytes = currentTotalBytesReceived;
const receivedBitsDelta = 8 * (currentTotalBytesReceived - lastTotalBytesReceived);
const passedSeconds = (currentTime - lastScanResult.time) / 1000.0;
lastScanResult.quality = Math.round(Math.min(100, receivedBitsDelta / expectedAudioBitRate * 100));
lastScanResult.time = currentTime;
ExpectedAudioBitRate for OPUS will be 35000 and for other codecs 70000
For a port-knocking scheme, I'm wondering how to make the iptables recent module temporarily (for just a few seconds) list-name matched source addresses. My intuition tells me that I need the --set function of the recent module to accept the --seconds option, making the list assignment temporary, but all I can see is the way to assign the list name to an address permanently and have another rule remove the list-name assignment only upon receipt of some later packet. The reason that doesn't fit into my mental concept is because the removal (--reap or --remove, I suppose) of the address from the list will only occur upon reception of a future packet, whereas my intuition wants the address removed at a certain time expiration regardless of whether any packets arrive to trigger said name removal. The only way I can see to do something vaguely similar to this is very non-intuitive to me, and therefore suspicious to me that I'm missing something about how it all works: I would need a recent module rule and --rcheck option to ensure the listed packet's name matches and that it had gotten assigned within the previous x seconds and remove it with a jump destination, the rule in that jump destination would be to assign the next list name to the source address. In the meantime, the length of the lists just keeps growing (don't they?), filling up with stray source addresses that never completed the knock sequence[s]. What a simple solution it would be for the recent module to accept the --seconds option with --set! Can anyone help me help me see this more clearly?
( I've looked at other knocking solutions using iptables, but they are limited to only using each port-protocol combination for one knock in the sequence, while a good knocking solution should, IMHO, allow for the same port-protocol combo to be used as many times in the knock sequence as the user wants it to be used. knockd had that same limitation, as well as exhibiting terrible non-robust operation. I tried to obtain the pknock module for iptables, but it appears that not all its components exist [specifically two shell scripts referred to in the documentation, knock.sh and knock-orig.sh, supposedly "found in doc/pknock/util", wherever that is...certainly not SF, Github, nor anywhere else I could see], making me very suspicious of using it.)
EDIT: I'm seeing that the ruleset needs to be even more complex than described - the knock steps numbered two and above all need to match the packet by name first, then jump it to their own chain that removes the name, determines whether the correct timing and port-protocol matches, then jump it to yet another chain to rename it, or don't jump it if timing or knock is off which falls into a drop rule. WHEW
My initial solution is shown below. The knocks in this example just happen to be unique, but non-unique knocks will function fine as well. As you can see, I make every knocking packet reap every list because I don't know if the lists self-limit the length of time they'll keep entries otherwise. It seems like the only way to ensure that no list can get too long.
$--> iptables -wnvL
Chain INPUT (policy DROP)
pkts bytes target prot opt in out source destination
0 0 ACCEPT tcp -- $internal_net_interface * 0.0.0.0/0 0.0.0.0/0 tcp dpt:22 ctstate RELATED,ESTABLISHED /* extract ssh for knock testg frm private side in ssh */
0 0 ACCEPT all -- * * 0.0.0.0/0 0.0.0.0/0 recent: REMOVE name: authorized side: source mask: 255.255.255.255 ctstate NEW /* 1-packet pass: 1 chance to establish or then knock higher */
0 0 knockerstest all -- $internal_net_interface * 0.0.0.0/0 0.0.0.0/0 recent: CHECK seconds: 200 name: knocker side: source mask: 255.255.255.255 /* for knock capability */
0 0 knockstage1 tcp -- $internal_net_interface * 0.0.0.0/0 0.0.0.0/0 tcp dpt:1 flags:0x17/0x02 recent: SET name: knocker side: source mask: 255.255.255.255 /* for knock capability, 1st port */
0 0 knockers all -- $external_net_interface * 0.0.0.0/0 0.0.0.0/0 recent: CHECK seconds: 200 name: knocker side: source mask: 255.255.255.255 ctstate NEW /* for port knock capability */
0 0 knockstage1 tcp -- $external_net_interface * 0.0.0.0/0 0.0.0.0/0 ctstate NEW tcp dpt:1 flags:0x17/0x02 recent: SET name: knocker side: source mask: 255.255.255.255 /* for port knock capability, 1st port */
Chain knockerreap (10 references)
pkts bytes target prot opt in out source destination
0 0 all -- * * 0.0.0.0/0 0.0.0.0/0 recent: CHECK seconds: 60 reap name: knocker side: source mask: 255.255.255.255
0 0 all -- * * 0.0.0.0/0 0.0.0.0/0 recent: SET name: knockstage1 side: source mask: 255.255.255.255
0 0 all -- * * 0.0.0.0/0 0.0.0.0/0 recent: SET name: knockstage2 side: source mask: 255.255.255.255
0 0 all -- * * 0.0.0.0/0 0.0.0.0/0 recent: SET name: knockstage3 side: source mask: 255.255.255.255
0 0 all -- * * 0.0.0.0/0 0.0.0.0/0 recent: SET name: knockstage4 side: source mask: 255.255.255.255
0 0 all -- * * 0.0.0.0/0 0.0.0.0/0 recent: SET name: knockstage5 side: source mask: 255.255.255.255
0 0 all -- * * 0.0.0.0/0 0.0.0.0/0 recent: SET name: knockstage6 side: source mask: 255.255.255.255
0 0 all -- * * 0.0.0.0/0 0.0.0.0/0 recent: SET name: knockstage7 side: source mask: 255.255.255.255
0 0 all -- * * 0.0.0.0/0 0.0.0.0/0 recent: SET name: knockstage8 side: source mask: 255.255.255.255
0 0 all -- * * 0.0.0.0/0 0.0.0.0/0 recent: CHECK seconds: 12 reap name: knockstage1 side: source mask: 255.255.255.255
0 0 all -- * * 0.0.0.0/0 0.0.0.0/0 recent: CHECK seconds: 12 reap name: knockstage2 side: source mask: 255.255.255.255
0 0 all -- * * 0.0.0.0/0 0.0.0.0/0 recent: CHECK seconds: 12 reap name: knockstage3 side: source mask: 255.255.255.255
0 0 all -- * * 0.0.0.0/0 0.0.0.0/0 recent: CHECK seconds: 12 reap name: knockstage4 side: source mask: 255.255.255.255
0 0 all -- * * 0.0.0.0/0 0.0.0.0/0 recent: CHECK seconds: 12 reap name: knockstage5 side: source mask: 255.255.255.255
0 0 all -- * * 0.0.0.0/0 0.0.0.0/0 recent: CHECK seconds: 12 reap name: knockstage6 side: source mask: 255.255.255.255
0 0 all -- * * 0.0.0.0/0 0.0.0.0/0 recent: CHECK seconds: 12 reap name: knockstage7 side: source mask: 255.255.255.255
0 0 all -- * * 0.0.0.0/0 0.0.0.0/0 recent: CHECK seconds: 12 reap name: knockstage8 side: source mask: 255.255.255.255
0 0 all -- * * 0.0.0.0/0 0.0.0.0/0 recent: REMOVE name: knockstage1 side: source mask: 255.255.255.255
0 0 all -- * * 0.0.0.0/0 0.0.0.0/0 recent: REMOVE name: knockstage2 side: source mask: 255.255.255.255
0 0 all -- * * 0.0.0.0/0 0.0.0.0/0 recent: REMOVE name: knockstage3 side: source mask: 255.255.255.255
0 0 all -- * * 0.0.0.0/0 0.0.0.0/0 recent: REMOVE name: knockstage4 side: source mask: 255.255.255.255
0 0 all -- * * 0.0.0.0/0 0.0.0.0/0 recent: REMOVE name: knockstage5 side: source mask: 255.255.255.255
0 0 all -- * * 0.0.0.0/0 0.0.0.0/0 recent: REMOVE name: knockstage6 side: source mask: 255.255.255.255
0 0 all -- * * 0.0.0.0/0 0.0.0.0/0 recent: REMOVE name: knockstage7 side: source mask: 255.255.255.255
0 0 all -- * * 0.0.0.0/0 0.0.0.0/0 recent: REMOVE name: knockstage8 side: source mask: 255.255.255.255
Chain knockers (1 references)
pkts bytes target prot opt in out source destination
0 0 knockerreap all -- * * 0.0.0.0/0 0.0.0.0/0 ! ctstate NEW /* for port knock capability */
0 0 knockersort all -- * * 0.0.0.0/0 0.0.0.0/0 ctstate NEW /* for port knock capability */
0 0 LOG all -- * * 0.0.0.0/0 0.0.0.0/0 LOG flags 0 level 4 prefix "pktfail:knock|late|ctstate "
0 0 all -- * * 0.0.0.0/0 0.0.0.0/0 recent: CHECK seconds: 60 reap name: knocker side: source mask: 255.255.255.255
0 0 all -- * * 0.0.0.0/0 0.0.0.0/0 recent: REMOVE name: knocker side: source mask: 255.255.255.255
0 0 knockerreap all -- * * 0.0.0.0/0 0.0.0.0/0
0 0 DROP all -- * * 0.0.0.0/0 0.0.0.0/0
Chain knockersort (2 references)
pkts bytes target prot opt in out source destination
0 0 knockstage2 tcp -- * * 0.0.0.0/0 0.0.0.0/0 tcp dpt:2 flags:0x17/0x02 recent: CHECK seconds: 12 name: knockstage2 side: source mask: 255.255.255.255 /* knock to stage 2 successful */
0 0 knockstage3 tcp -- * * 0.0.0.0/0 0.0.0.0/0 tcp dpt:3 flags:0x17/0x02 recent: CHECK seconds: 12 name: knockstage3 side: source mask: 255.255.255.255 /* knock to stage 3 successful */
0 0 knockstage4 tcp -- * * 0.0.0.0/0 0.0.0.0/0 tcp dpt:4 flags:0x17/0x02 recent: CHECK seconds: 12 name: knockstage4 side: source mask: 255.255.255.255 /* knock to stage 4 successful */
0 0 knockstage5 tcp -- * * 0.0.0.0/0 0.0.0.0/0 tcp dpt:5 flags:0x17/0x02 recent: CHECK seconds: 12 name: knockstage5 side: source mask: 255.255.255.255 /* knock to stage 5 successful */
0 0 knockstage6 tcp -- * * 0.0.0.0/0 0.0.0.0/0 tcp dpt:6 flags:0x17/0x02 recent: CHECK seconds: 12 name: knockstage6 side: source mask: 255.255.255.255 /* knock to stage 6 successful */
0 0 knockstage7 tcp -- * * 0.0.0.0/0 0.0.0.0/0 tcp dpt:7 flags:0x17/0x02 recent: CHECK seconds: 12 name: knockstage7 side: source mask: 255.255.255.255 /* knock to stage 7 successful */
Chain knockerstest (1 references)
pkts bytes target prot opt in out source destination
0 0 knockersort all -- * * 0.0.0.0/0 0.0.0.0/0
0 0 LOG all -- * * 0.0.0.0/0 0.0.0.0/0 LOG flags 0 level 4 prefix "knockertest fail "
0 0 all -- * * 0.0.0.0/0 0.0.0.0/0 recent: CHECK seconds: 60 reap name: knocker side: source mask: 255.255.255.255
0 0 all -- * * 0.0.0.0/0 0.0.0.0/0 recent: REMOVE name: knocker side: source mask: 255.255.255.255
0 0 knockerreap all -- * * 0.0.0.0/0 0.0.0.0/0
0 0 DROP all -- * * 0.0.0.0/0 0.0.0.0/0
Chain knockstage1 (2 references)
pkts bytes target prot opt in out source destination
0 0 knockerreap all -- * * 0.0.0.0/0 0.0.0.0/0
0 0 LOG all -- * * 0.0.0.0/0 0.0.0.0/0 recent: SET name: knockstage2 side: source mask: 255.255.255.255 /* Entry in log makes blacklisting get delayed until after knocking time window expires */ LOG flags 0 level 4 prefix "knocked: Stage1 "
0 0 DROP all -- * * 0.0.0.0/0 0.0.0.0/0
Chain knockstage2 (1 references)
pkts bytes target prot opt in out source destination
0 0 knockerreap all -- * * 0.0.0.0/0 0.0.0.0/0
0 0 LOG all -- * * 0.0.0.0/0 0.0.0.0/0 recent: SET name: knockstage3 side: source mask: 255.255.255.255 /* Entry in log makes blacklisting get delayed until after knocking time window expires */ LOG flags 0 level 4 prefix "knocked: Stage2 "
0 0 DROP all -- * * 0.0.0.0/0 0.0.0.0/0
Chain knockstage3 (1 references)
pkts bytes target prot opt in out source destination
0 0 knockerreap all -- * * 0.0.0.0/0 0.0.0.0/0
0 0 LOG all -- * * 0.0.0.0/0 0.0.0.0/0 recent: SET name: knockstage4 side: source mask: 255.255.255.255 /* Entry in log makes blacklisting get delayed until after knocking time window expires */ LOG flags 0 level 4 prefix "knocked: Stage3 "
0 0 DROP all -- * * 0.0.0.0/0 0.0.0.0/0
Chain knockstage4 (1 references)
pkts bytes target prot opt in out source destination
0 0 knockerreap all -- * * 0.0.0.0/0 0.0.0.0/0
0 0 LOG all -- * * 0.0.0.0/0 0.0.0.0/0 recent: SET name: knockstage5 side: source mask: 255.255.255.255 /* Entry in log makes blacklisting get delayed until after knocking time window expires */ LOG flags 0 level 4 prefix "knocked: Stage4 "
0 0 DROP all -- * * 0.0.0.0/0 0.0.0.0/0
Chain knockstage5 (1 references)
pkts bytes target prot opt in out source destination
0 0 knockerreap all -- * * 0.0.0.0/0 0.0.0.0/0
0 0 LOG all -- * * 0.0.0.0/0 0.0.0.0/0 recent: SET name: knockstage6 side: source mask: 255.255.255.255 /* Entry in log makes blacklisting get delayed until after knocking time window expires */ LOG flags 0 level 4 prefix "knocked: Stage5 "
0 0 DROP all -- * * 0.0.0.0/0 0.0.0.0/0
Chain knockstage6 (1 references)
pkts bytes target prot opt in out source destination
0 0 knockerreap all -- * * 0.0.0.0/0 0.0.0.0/0
0 0 LOG all -- * * 0.0.0.0/0 0.0.0.0/0 recent: SET name: knockstage7 side: source mask: 255.255.255.255 /* Entry in log makes blacklisting get delayed until after knocking time window expires */ LOG flags 0 level 4 prefix "knocked: Stage6 "
0 0 DROP all -- * * 0.0.0.0/0 0.0.0.0/0
Chain knockstage7 (1 references)
pkts bytes target prot opt in out source destination
0 0 knockerreap all -- * * 0.0.0.0/0 0.0.0.0/0
0 0 LOG all -- * * 0.0.0.0/0 0.0.0.0/0 recent: SET name: authorized side: source mask: 255.255.255.255 /* allows time-limited access */ LOG flags 0 level 4 prefix "knock full success "
0 0 DROP all -- * * 0.0.0.0/0 0.0.0.0/0
I have an Apache (OHS) httpd process (1 out of 8 actually) talking to 2 web entry servers (WES), both on RedHat. Plotting the response times taken from the respective logfiles shows a constant delta of around 50 ms between both. Using strace strace -o <trace output> -ttT -s 2048 -f -xx -p <Pid> I found that in 85% of the requests (where encrypted transfer is involved) the httpd process is somehow stuck in poll(), which returns only after 38.something ms. The remaining 10 ms are mainly due to excessive gettimeofday() and other time() related system calls. The WES on the other hand claims he could send the data within below 100 µs but accuses "resource temporarily unavailable" via recvfrom() and now poll()s on his side for some 50 ms before recvfrom() finishes (with the confirmation of the data transfer from the Apache, I suppose).
WES:
40685 16:54:57.111496 poll([{fd=39, events=POLLOUT|POLLWRNORM}], 1, 300000) = 1 ([{fd=39, revents=POLLOUT|POLLWRNORM}]) <0.000071>
40685 16:54:57.111666 sendto(39, " <encrypted data> ) ", 1053, 0, NULL, 0) = 1053 <0.000067>
40685 16:54:57.112249 recvfrom(39, 0x7ff8380c0243, 5, 0, 0, 0) = -1 EAGAIN (Resource temporarily unavailable) <0.000061>
40685 16:54:57.112405 poll([{fd=39, events=POLLIN}], 1, 300000 <unfinished ...>
40685 16:54:57.165084 <... poll resumed> ) = 1 ([{fd=39, revents=POLLIN}]) <0.052659>
40685 16:54:57.165177 recvfrom(39, " ", 1, MSG_PEEK, NULL, NULL) = 1 <0.000114>
40685 16:54:57.165388 ioctl(39, FIONREAD, [205]) = 0 <0.000078>
Apache (OHS):
63195 16:54:57.145220 <... poll resumed> ) = 1 ([{fd=22, revents=POLLIN}]) <0.038408>
63195 16:54:57.145299 read(22, " <encrypted data> ", 8000) = 1053 <0.000018>
63195 16:54:57.145739 clock_gettime(CLOCK_REALTIME, {1435589697, 145769536}) = 0 <0.000018>
63195 16:54:57.145810 gettimeofday({1435589697, 145826}, NULL) = 0 <0.000025>
63195 16:54:57.145879 clock_gettime(CLOCK_REALTIME, {1435589697, 145902010}) = 0 <0.000021>
63195 16:54:57.145960 clock_gettime(CLOCK_REALTIME, {1435589697, 145986422}) = 0 <0.000017>
I have two questions:
Is the information in the trace output sufficient to identify the cause of the excessive poll() 38 ms (and obviously what is it then)?
What can be done to improve tracing in case 1) must be answered with no?
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I'm Trying to write a Cisco Command Line Parser to have an automated Graphical User Interface replacement for the Cisco console output. I have been able to get the ping time using Regular Expressions from a ping output and graph it, but am now stuck with more detailed out put of other commands like "Show interfaces" command,
any ideas how I can parse the Show Interface command output and extract all the useful info which i need?
Here is a "Show Interfaces" out put example:
FastEthernet0/0 is up, line protocol is up
Hardware is MV96340 Ethernet, address is 0018.189d.1df0 (bia 0018.189d.1df0)
Description: IP+ connection
Internet address is 164.128.251.50/24
MTU 1500 bytes, BW 100000 Kbit/sec, DLY 100 usec,
reliability 255/255, txload 1/255, rxload 1/255
Encapsulation ARPA, loopback not set
Keepalive set (10 sec)
Full-duplex, 100Mb/s, 100BaseTX/FX
ARP type: ARPA, ARP Timeout 04:00:00
Last input 00:00:00, output 00:00:00, output hang never
Last clearing of "show interface" counters never
Input queue: 0/75/3718/0 (size/max/drops/flushes); Total output drops: 0
Queueing strategy: fifo
Output queue: 0/40 (size/max)
5 minute input rate 2000 bits/sec, 6 packets/sec
5 minute output rate 3000 bits/sec, 10 packets/sec
152817108 packets input, 1043050554 bytes
Received 77347880 broadcasts (67140888 IP multicasts)
0 runts, 0 giants, 3351 throttles
381823 input errors, 0 CRC, 0 frame, 0 overrun, 381823 ignored
0 watchdog
0 input packets with dribble condition detected
--More-- 99065802 packets output, 440637782 bytes, 0 underruns
0 output errors, 0 collisions, 2 interface resets
300246 unknown protocol drops
0 babbles, 0 late collision, 0 deferred
0 lost carrier, 0 no carrier
0 output buffer failures, 0 output buffers swapped out
FastEthernet0/1 is administratively down, line protocol is down
Hardware is MV96340 Ethernet, address is 0018.189d.1df1 (bia 0018.189d.1df1)
MTU 1500 bytes, BW 100000 Kbit/sec, DLY 100 usec,
reliability 255/255, txload 1/255, rxload 1/255
Encapsulation ARPA, loopback not set
Keepalive set (10 sec)
Auto-duplex, Auto Speed, 100BaseTX/FX
ARP type: ARPA, ARP Timeout 04:00:00
Last input never, output never, output hang never
Last clearing of "show interface" counters never
Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 0
Queueing strategy: fifo
Output queue: 0/40 (size/max)
5 minute input rate 0 bits/sec, 0 packets/sec
5 minute output rate 0 bits/sec, 0 packets/sec
0 packets input, 0 bytes
Received 0 broadcasts (0 IP multicasts)
--More-- 0 runts, 0 giants, 0 throttles
--More-- 0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored
0 watchdog
0 input packets with dribble condition detected
0 packets output, 0 bytes, 0 underruns
0 output errors, 0 collisions, 0 interface resets
0 unknown protocol drops
0 babbles, 0 late collision, 0 deferred
0 lost carrier, 0 no carrier
0 output buffer failures, 0 output buffers swapped out
Tunnel0 is up, line protocol is up
Hardware is Tunnel
Interface is unnumbered. Using address of FastEthernet0/0 (164.128.251.50)
MTU 17912 bytes, BW 100 Kbit/sec, DLY 50000 usec,
reliability 255/255, txload 1/255, rxload 1/255
Encapsulation TUNNEL, loopback not set
Keepalive not set
Tunnel source 164.128.251.50 (FastEthernet0/0), destination 164.128.32.1
Tunnel Subblocks:
src-track:
Tunnel0 source tracking subblock associated with FastEthernet0/0
Set of tunnels with source FastEthernet0/0, 1 member (includes iterators), on interface
Tunnel protocol/transport PIM/IPv4
--More-- Tunnel TOS/Traffic Class 0xC0, Tunnel TTL 255
--More-- Tunnel transport MTU 1472 bytes
Tunnel is transmit only
Tunnel transmit bandwidth 8000 (kbps)
Tunnel receive bandwidth 8000 (kbps)
Last input never, output 28w1d, output hang never
Last clearing of "show interface" counters never
Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 0
Queueing strategy: fifo
Output queue: 0/0 (size/max)
5 minute input rate 0 bits/sec, 0 packets/sec
5 minute output rate 0 bits/sec, 0 packets/sec
0 packets input, 0 bytes, 0 no buffer
Received 0 broadcasts (0 IP multicasts)
0 runts, 0 giants, 0 throttles
0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored, 0 abort
44 packets output, 2464 bytes, 0 underruns
0 output errors, 0 collisions, 0 interface resets
0 unknown protocol drops
0 output buffer failures, 0 output buffers swapped out
Virtual-Access1 is up, line protocol is up
Hardware is Virtual Access interface
Description: Internally created by SSLVPN context TEST
MTU 1406 bytes, BW 100000 Kbit/sec, DLY 100000 usec,
--More-- reliability 255/255, txload 1/255, rxload 1/255
--More-- Encapsulation SSL
Internal vaccess
Vaccess status 0x0, loopback not set
Keepalive set (10 sec)
DTR is pulsed for 5 seconds on reset
Last input never, output never, output hang never
Last clearing of "show interface" counters 29w5d
Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 0
Queueing strategy: fifo
Output queue: 0/40 (size/max)
5 minute input rate 0 bits/sec, 0 packets/sec
5 minute output rate 0 bits/sec, 0 packets/sec
0 packets input, 0 bytes, 0 no buffer
Received 0 broadcasts (0 IP multicasts)
0 runts, 0 giants, 0 throttles
0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored, 0 abort
0 packets output, 0 bytes, 0 underruns
0 output errors, 0 collisions, 0 interface resets
0 unknown protocol drops
0 output buffer failures, 0 output buffers swapped out
0 carrier transitions
Interface_Long_Split = Regex.Split(Result_Long, "(POS[0-9]/[0-9]/[0-9])|(POS[0-9]/[0-9])|(GigabitEthernet[0-9]/[0-9])|(FastEthernet[0-9]/[0-9])")
Dim count As Integer = 0
For i = 0 To Interface_Long_Split.Length
If Regex.IsMatch(Interface_Long_Split(i), "(POS[0-9]/[0-9]/[0-9])|(POS[0-9]/[0-9])|(GigabitEthernet[0-9]/[0-9])|(FastEthernet[0-9]/[0-9])") = True Then
ReDim Preserve Interfaces_List(count)
Interfaces_List(count) = Interface_Long_Split(i)
count = count + 1
End If
imho you are probably on a hiding to nothing.
you could try parsing those complex outputs a line at a time rather than as one big blob.
My data is 30KB on disk (Serialized object) was size should the binary field in t-sql be?
Is the brackets bit bytes ?
... so is binary(30000) .... 30KB?
Thanks
You need to use the varbinary(max) data type; the maximum allowed size for binary is 8,000 bytes. Per the MSDN page on binary and varbinary:
varbinary [ ( n | max) ]
Variable-length binary data. n can be a value from 1 through 8,000. max indicates that the maximum storage size is 2^31-1 bytes. The storage size is the actual length of the data entered + 2 bytes. The data that is entered can be 0 bytes in length.
The number after binary() is the number of bytes, see MSDN:
binary [ ( n ) ]
Fixed-length binary data of n bytes. n
must be a value from 1 through 8,000.
Storage size is n+4 bytes.
Whether 30kb is 30000 or 30720 bytes depends on which binary prefix system your file system is using.