Watchguard X1000 and Cisco 1800 T-1 Router

I have a Watchguard X1000 and a Cisco 1800 Series T-1 Router in production.
There have been intermittent issues with VPN connectivity to the Watchguard Firebox.
E0/1 on the cisco is connected to the External interface on the firebox.
I have used simple ping tests to narrow down where the issue may be.

I started from the outside in and here is what I ended up determining.

When I put a heavy load of datagram pings from the router to the firewalls external interface, I get alot of time outs.  I'm talking a heavy load of 20,000 pings at 5,000 datagram size per.  Both interfaces are set to auto negotiate full duplex and I was wondering if I shouldn't just hard code these two interfaces.  

I'm pretty sure that the problem with my disconnecting VPN's is between these two devices from the testing that I've done so far.

Any suggestions or advise would be greatly apprecited.

Mike

LVL 10
mcrosslandAsked:
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Pentrix2Commented:
I would first hard code the interfaces to 100full, then I would make the mtu at least 1426 or 1485.
mcrosslandAuthor Commented:
My current MTU on the firebox is 1500
Nothing set on the router.
interface FastEthernet0/0
 description Connected to DDC LAN
 ip address x.x.x.x x.x.x.x
 no ip redirects
 no ip unreachables
 no ip proxy-arp
 ip route-cache flow
 duplex auto
 speed auto
 no mop enabled

Can you explain MTU a bit more?
mcrosslandAuthor Commented:
Changed both to 100 full.
Still getting time outs when doing a ping from the router to the firebox.
Here is what I'm putting in.  Maybe this will give some more insight.

rtr-ddc#ping
Protocol [ip]:
Target IP address: 65.115.200.210
Repeat count [5]: 10000
Datagram size [100]: 5000
Timeout in seconds [2]:
Extended commands [n]:
Sweep range of sizes [n]:
Type escape sequence to abort.
Sending 10000, 5000-byte ICMP Echos to 65.115.200.210, timeout is 2 seconds:
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Success rate is 99 percent (9911/10000), round-trip min/avg/max = 1/2/16 ms
rtr-ddc#ping
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Pentrix2Commented:
MTU is the datagram packet size.  The smaller it is, then the more fragments you'll get.  The larger you set it then the less, but this could also cause a delay.  So on the router set it to 100full with mtu being 1416.  Then try the test again.

Post the output:

show interface fa0/0
mcrosslandAuthor Commented:
rtr-ddc(config-if)#MTU 1416
% Interface FastEthernet0/1 does not support user settable mtu.
Pentrix2Commented:
alrite, i guess we can't put it there then.  :(

You got the output of the interface?
mcrosslandAuthor Commented:
interface FastEthernet0/0
 description Connected to DDC LAN
 ip address 65.115.200.209 255.255.255.248
 no ip redirects
 no ip unreachables
 no ip proxy-arp
 ip route-cache flow
 speed 100
 full-duplex
Pentrix2Commented:
I'm looking for this type of output (sh int fa0/0), not the configuration of the interface

Internet-GW#sh interfaces ethernet 0/0
Ethernet0/0 is up, line protocol is up
  Hardware is AmdP2, address is 0030.806d.0ba0 (bia 0030.806d.0ba0)
  Internet address is 65.126.22.161/27
  MTU 1500 bytes, BW 10000 Kbit, DLY 1000 usec,
     reliability 255/255, txload 3/255, rxload 1/255
  Encapsulation ARPA, loopback not set
  Keepalive set (10 sec)
  ARP type: ARPA, ARP Timeout 04:00:00
  Last input 00:00:09, output 00:00:00, 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 8000 bits/sec, 13 packets/sec
  5 minute output rate 128000 bits/sec, 16 packets/sec
     57754503 packets input, 952680732 bytes, 0 no buffer
     Received 585 broadcasts, 0 runts, 0 giants, 0 throttles
     32 input errors, 0 CRC, 0 frame, 0 overrun, 32 ignored
     0 input packets with dribble condition detected
     70867769 packets output, 2219388603 bytes, 0 underruns
     0 output errors, 925603 collisions, 2 interface resets
     0 babbles, 0 late collision, 427050 deferred
     0 lost carrier, 0 no carrier
     0 output buffer failures, 0 output buffers swapped out
Internet-GW#
mcrosslandAuthor Commented:
rtr-ddc#   show int f0/0
FastEthernet0/0 is up, line protocol is up
  Hardware is Gt96k FE, address is 0015.c6bb.2c1e (bia 0015.c6bb.2c1e)
  Description: Connected to DDC LAN
  Internet address is 65.115.200.209/29
  MTU 1500 bytes, BW 100000 Kbit, 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 00:08:37, output 00:00:03, 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 2000 bits/sec, 0 packets/sec
  5 minute output rate 40000 bits/sec, 0 packets/sec
     5872250 packets input, 2494628586 bytes
     Received 1616 broadcasts, 0 runts, 0 giants, 0 throttles
     0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored
     0 watchdog
     0 input packets with dribble condition detected
     5760197 packets output, 255181495 bytes, 0 underruns
     0 output errors, 0 collisions, 13 interface resets
     0 babbles, 0 late collision, 0 deferred
     0 lost carrier, 0 no carrier
     0 output buffer failures, 0 output buffers swapped out
mcrosslandAuthor Commented:
For what its worth, I'm going to run by there and change out my ethernet cable.
mcrosslandAuthor Commented:
Changed the cable and tested.  Still have time outs.
Put a high speed switch between the cisco and the watchguard and tested.  Same problem.
Pentrix2Commented:
Is this how your setup looks like:

internet
|
1801
|
watchguard
|
switch
|
users
mcrosslandAuthor Commented:
Yes
Pentrix2Commented:
I noticed you are pinging an external address when you did your 1,000 ping test.  Try pinging from the router to the watchguard outside interface.  I got a feeling the watchguard and the inside interface of the router is fine, but it's on the outside interface of the router.

Pentrix2
mcrosslandAuthor Commented:
That was from the router to the watchguard outside interface.
I tested both from the Ethernet source and the serial source on the router with the same types of timeouts.
Here is one from the serial interface to the watchguard external interface with a datagram size of 100.
rtr-ddc# ping
Protocol [ip]:
Target IP address: 65.115.200.210
Repeat count [5]: 10000
Datagram size [100]:
Timeout in seconds [2]:
Extended commands [n]: y
Source address or interface: 216.111.104.138
Type of service [0]:
Set DF bit in IP header? [no]:
Validate reply data? [no]:
Data pattern [0xABCD]:
Loose, Strict, Record, Timestamp, Verbose[none]:
Sweep range of sizes [n]:
Type escape sequence to abort.
Sending 10000, 100-byte ICMP Echos to 65.115.200.210, timeout is 2 secon
Packet sent with a source address of 216.111.104.138
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a1rh0pperVP of Technical ServicesCommented:
Check the Denial of Service settings on the Firebox.

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APPUNDCommented:
This is exactly the same issue I am having. However, it is a router to a metro-E line. can you mak the mtu size larger on a router ?
mcrosslandAuthor Commented:
This question is closed.   You can post another question and put in a reference to this question if you like.
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