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Version 15.1(4)M4 outgoing byte count wrong

In IOS Version 15.1(4)M4 running on an 1811 the output byte count appears to be wrong on Virtual-Access interfaces for L2TP/IPsec.

Virtual-Access2 is up, line protocol is up Hardware is Virtual Access interface MTU 1500 bytes, BW 100000 Kbit/sec, DLY 100000 usec, reliability 255/255, txload 1/255, rxload 1/255 Encapsulation PPP, LCP Closed Base PPPoVPDN vaccess Vaccess status 0x44, loopback not set Keepalive set (10 sec) DTR is pulsed for 5 seconds on reset Last input 00:00:00, output never, output hang never Last clearing of "show interface" counters 2d18h Input queue: 0/4096/0/0 (size/max/drops/flushes); Total output drops: 0 Queueing strategy: fifo Output queue: 0/40 (size/max) 5 minute input rate 4000 bits/sec, 2 packets/sec 5 minute output rate 0 bits/sec, 0 packets/sec 49120 packets input, 7045240 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 52961 packets output, 52168 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

Virtual-Access2.1 is up, line protocol is up Hardware is Virtual Access interface Interface is unnumbered. Using address of Loopback0 (172.31.32.126) MTU 1500 bytes, BW 7200 Kbit/sec, DLY 100000 usec, reliability 255/255, txload 1/255, rxload 1/255 Encapsulation PPP, LCP Open Open: IPCP PPPoVPDN vaccess, cloned from Virtual-Template2 Vaccess status 0x0 Protocol l2tp, tunnel id 26551, session id 31061 Keepalive set (10 sec) 5165 packets input, 972655 bytes 5167 packets output, 3595 bytes Last clearing of "show interface" counters never

The "packets input", "packets output" and "bytes input" look like they could be correct, but the "bytes output" clearly is wrong.

This worked OK on our previous router under 12.4 Is this a bug or a functionality change? Could it be that it can be made working with some config change?

interface Virtual-Template2 description L2TP/IPsec VPN template ip unnumbered Loopback0 ip access-group dialup-in in ip access-group dialup-out out ip mtu 1400 ip tcp adjust-mss 1350 peer default ip address pool vpnpool ppp authentication ms-chap-v2 ms-chap ppp pap refuse

Reply to
Rob
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I still wonder if it is a bug or if there is a new feature introduced between 12.4 and 15.1 that requires me to add some configuration to get correct bytecounts.

Reply to
Rob

I doubt there is anything to configure. We've been plagued with wrong traffic counts on various router loads over the last many years all the time on many different cisco platforms. Its something we can almost count on :( Until we find the magic version that fixes it with the feature set we want.

Reply to
Doug McIntyre

Well, it has worked OK here for quite some time (we make nice traffic graphs out of these via snmp), but I upgraded this router to this version because of an ISAKMP security issue and to see if it resolves other problems, and unfortunately I have now two new issues. (this one and the different handling of ip local pool)

Reply to
Rob

Unfortunately it turns out to be wrong in the RADIUS accounting as well...

Apparently it is not a display issue but the actual counter has been busted and its wrong value appears everywhere (show interfaces, SNMP values, RADIUS accounting)

Reply to
Rob

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