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Cisco 2951 router issues

roncro
Level 3
Level 3

Hello,   I have a Cisco 2951 router I use at home,  and I suspect it to give me some issues.

 

The internet (via a cisco cable modem)  drops the conenction (status says there is no traffic)  and the connection drops

I checked the router and I see log messages saying:

Oct 12 01:09:41.068: %IP_VFR-3-COALESCE_ERROR: Unable to coalesce fragments arriving through GigabitEthernet0/0 - datagram 4121 bytes is too big. UDP packet 75.75.75.75:53 -> A.B.C.D:59499 has ident: 50999 flags:0x0 and 3 fragments

 

At first I thought it was the modem, or the cable connection,  but now I am not sure.  The problem seems to be intermittent and comes in "waves".

(The 75.75.75.75 is a comcast dns server)

 

Also,  when the  internet connection drops,  the router seems to become unresponsive (can't ping it,  if logged it it drops the session)

any ideas?

Thanks,

 

Ron

1 Accepted Solution

Accepted Solutions

Hello


@roncro wrote:

 

If I delete the oldest IOS,  and put the new one

 (c2951-universalk9-mz.SPA.156-3.M9.bin)

on it I'd have 4Mb left or so, is that a good idea?


Yes, if you have the new ios on now and you dont have much space remove the old one, also the cpexpress tar  file if you dont use it?.


delete flash0:c2951-universalk9-mz.SPA.151-4.M4.bin
delete flash0:cpexpress.tar 


@roncro wrote:

%Error opening tftp://192.168.2.8/c2951-universalk9-mz.SPA.154-1.T1.bin
(No such file or directory)
I guess I am doing something wrong

copy flash0:c2951-universalk9-mz.SPA.154-1.T1.bin tftp: <--colon

Please rate and mark as an accepted solution if you have found any of the information provided useful.
This then could assist others on these forums to find a valuable answer and broadens the community’s global network.

Kind Regards
Paul

View solution in original post

22 Replies 22

roncro
Level 3
Level 3

Also once the connection is up,  when I ping google.com  the

icmp

responses I get  come from youtube-ui.l.google.com ..   and when I do a traceroute to something (like a dns server)  I  seeem to get different routes,  with different response times

I found some references to bugs that could generate this error. Is the router directly on the internet with a public IP address? If so, it could be getting attacked. If it is behind a firewall then the bug scenario sounds more likely.

Yes it is connected to the internet via a modem, but from the outside only an ssh port is open,  and is directly forwarded to a linux machine. (which has a firewall)

balaji.bandi
Hall of Fame
Hall of Fame

Can you post show version and show interface

GigabitEthernet0/0

 

BB

***** Rate All Helpful Responses *****

How to Ask The Cisco Community for Help

Here it is,

 

it looks like it just restarted ...  

 

 

here is the info,  thanks!

Charon-2951 uptime is 16 minutes
System returned to ROM by address error at PC 0x4AC7AD4, address 0x4AC7AD4 at 09:36:57 MDT Thu Oct 12 2023
System restarted at 09:38:53 MDT Thu Oct 12 2023
System image file is "flash0:c2951-universalk9-mz.SPA.151-4.M4.bin"
Last reload type: Normal Reload


This product contains cryptographic features and is subject to United
States and local country laws governing import, export, transfer and
use. Delivery of Cisco cryptographic products does not imply
third-party authority to import, export, distribute or use encryption.
Importers, exporters, distributors and users are responsible for
compliance with U.S. and local country laws. By using this product you
agree to comply with applicable laws and regulations. If you are unable
to comply with U.S. and local laws, return this product immediately.

A summary of U.S. laws governing Cisco cryptographic products may be found at:
http://www.cisco.com/wwl/export/crypto/tool/stqrg.html

If you require further assistance please contact us by sending email to
export@cisco.com.

Cisco CISCO2951/K9 (revision 1.1) with 483328K/40960K bytes of memory.
Processor board ID FCZ1622702R
3 Gigabit Ethernet interfaces
1 terminal line
DRAM configuration is 72 bits wide with parity enabled.
255K bytes of non-volatile configuration memory.
250880K bytes of ATA System CompactFlash 0 (Read/Write)


License Info:

License UDI:

-------------------------------------------------
Device# PID SN
-------------------------------------------------
*0 CISCO2951/K9 FCZ1622702R




Technology Package License Information for Module:'c2951'

-----------------------------------------------------------------
Technology Technology-package Technology-package
Current Type Next reboot
------------------------------------------------------------------
ipbase ipbasek9 Permanent ipbasek9
security None None None
uc uck9 Permanent uck9
data None None None

Configuration register is 0x2102


Charon-2951#show interface GigabitEthernet0/0
GigabitEthernet0/0 is up, line protocol is up
Hardware is PQ3_TSEC, address is a44c.11d4.afc0 (bia a44c.11d4.afc0)
Description: WAN
Internet address is 69.254.c.d/23
MTU 1500 bytes, BW 1000000 Kbit/sec, DLY 10 usec,
reliability 255/255, txload 1/255, rxload 1/255
Encapsulation ARPA, loopback not set
Keepalive set (10 sec)
Full Duplex, 1Gbps, media type is RJ45
output flow-control is unsupported, input flow-control is unsupported
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: 0/75/185/0 (size/max/drops/flushes); Total output drops: 0
Queueing strategy: fifo
Output queue: 0/40 (size/max)
5 minute input rate 1371000 bits/sec, 158 packets/sec
5 minute output rate 72000 bits/sec, 56 packets/sec
464814 packets input, 458030740 bytes, 0 no buffer
Received 5 broadcasts (0 IP multicasts)
0 runts, 0 giants, 3 throttles
0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored
0 watchdog, 0 multicast, 0 pause input
189244 packets output, 26921538 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 pause output
0 output buffer failures, 0 output buffers swapped out

 

 

 

Hello
Possible bug <here> try upgrading software.


Please rate and mark as an accepted solution if you have found any of the information provided useful.
This then could assist others on these forums to find a valuable answer and broadens the community’s global network.

Kind Regards
Paul

Thanks Paul,

I checked and saw, this below.  Is there an "ideal"  size to try?  (without messing too much up?)

(I did actually see some " Unable to coalesce fragments.."  errors  yesterday,  but don't see them now any more.  They appeared to be generated by a

comcast/xfinity dns server

)

thanks,

Ron

Charon-2951(config)#buffers huge size ?
<18024-65535> Size of huge buffers

Charon-2951#show buffers
Buffer elements:
592 in free list (500 max allowed)
55988 hits, 0 misses, 617 created

Public buffer pools:
Small buffers, 104 bytes (total 80, permanent 50, peak 80 @ 00:28:35):
77 in free list (20 min, 150 max allowed)
18326 hits, 10 misses, 0 trims, 30 created
0 failures (0 no memory)
Middle buffers, 600 bytes (total 58, permanent 25, peak 58 @ 00:28:35):
56 in free list (10 min, 150 max allowed)
10816 hits, 11 misses, 0 trims, 33 created
0 failures (0 no memory)
Big buffers, 1536 bytes (total 51, permanent 50, peak 51 @ 00:29:22):
51 in free list (5 min, 150 max allowed)
27026 hits, 0 misses, 0 trims, 1 created
0 failures (0 no memory)
VeryBig buffers, 4520 bytes (total 11, permanent 10, peak 11 @ 00:29:22):
11 in free list (0 min, 100 max allowed)
8098 hits, 0 misses, 0 trims, 1 created
0 failures (0 no memory)
Large buffers, 5024 bytes (total 1, permanent 0, peak 1 @ 00:29:36):
1 in free list (0 min, 10 max allowed)
0 hits, 0 misses, 0 trims, 1 created
0 failures (0 no memory)
Huge buffers, 18024 bytes (total 5, permanent 0, peak 5 @ 00:29:22):
5 in free list (4 min, 10 max allowed)
0 hits, 0 misses, 0 trims, 5 created
0 failures (0 no memory)

Hello Paul,

Upgrading the software,  that means downloading a newer version of

"System Bootstrap, Version 15.0(1r)M13, RELEASE SOFTWARE (fc1)"  or of "flash0:c2951-universalk9-mz.SPA.151-4.M4.bin" 

(does one need a subscription for that?)

thanks,

 

Ron

If you like to download the software if your account CCO entitled then you can download

you need to download only IOS Image, Until the release notes ask you to upgrade ROMMON you do not need to upgrade that.

You can download 15.6 or 15.7 if you are entitled to download.

BB

***** Rate All Helpful Responses *****

How to Ask The Cisco Community for Help

Hello BB,

I don't have a service contract for that router,  so it looks like I can't download the updates.

thanks,

 

Ron

Hello
As long as you have a valid licence you will be okay


Please rate and mark as an accepted solution if you have found any of the information provided useful.
This then could assist others on these forums to find a valuable answer and broadens the community’s global network.

Kind Regards
Paul

Ok,  thanks,  I am trying to make room now.

Maybe I should first see if I can make

c2951-universalk9-mz.SPA.154-1.T1.bin

the current running image, since

flash0:c2951-universalk9-mz.SPA.151-4.M4.bin

is the one in use.

 

Then after that worked,  delete

151-4-mM4

one..  and try the

156/157?

(I wonder why it is on there, maybe it's corrupted)

thanks,

 

Ron

Hello
Yes install the new image and set the boot variable to run it as default.


Example:  xxx.bin file
Copy new ios to flash via tftp:

copy tftp:xxxxxxx.bin flash:


verify /md5 flash:xxxx.bin

dir flash:
sh bootvar
conf t
no boot system
boot system flash:xxxnNEWxx.bin
boot system flash:xxxnOLDxx.bin
exit
wr

reload



rtr should boot to new image, as/when your happy delete the old image from flash.




Please rate and mark as an accepted solution if you have found any of the information provided useful.
This then could assist others on these forums to find a valuable answer and broadens the community’s global network.

Kind Regards
Paul

I am going to try that;

the one that is running now is

 flash0:c2951-universalk9-mz.SPA.151-4.M4.bin

There is another one located on

flash: c2951-universalk9-mz.SPA.154-1.T1.bin  

(but don't know the state)

and I have also

 c2951-universalk9-mz.SPA.156-3.M9.bin

(but not on flash)

 

So with the above I want to switch to the

c2951-universalk9-mz.SPA.154-1.T1.bin

to see if it works.   Then back up the

c2951-universalk9-mz.SPA.151-4.M4.bin

with tftp and delete it.

Thendo the same thing again with

c2951-universalk9-mz.SPA.156-3.M9.bin

 

thanks!

 

Ron