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тАО06-01-2006 05:35 AM
тАО06-01-2006 05:35 AM
Issue:
If i ping from a workstation behind the router 2 out of 3 pings drop consistantly, but the 3rd ping goes through with no probelm and with low latency.
If I ping from behind the switch across the router it pings consistantly.
The cisco router has almost no utiliztion and about 32 MB ram free.
Any ideas?
Solved! Go to Solution.
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тАО06-01-2006 07:16 PM
тАО06-01-2006 07:16 PM
Re: Router on a Stick HP2554 vs. 1721
The Routerport to the SWITCH and the SWITCHport to the router are trunked?
One Router subnetz one VLAN.
The physical connection is ok, both ports has no errors?
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тАО06-02-2006 02:21 AM
тАО06-02-2006 02:21 AM
Re: Router on a Stick HP2554 vs. 1721
two tagged, one untagged
2. on sub per vlan.
3. no errors, no duplex mismatch. speed hardcoaded, etc
New info, I was pinging from one machine last night, and it was going through fine, got to another and it drops every other ping. It's like the swtich/router can only handle so many sessions.
I found a duples mismatch on another port that was sending lots of multi-cast traffic. i waiting for traffic to ramp up so I can see if this was part of the issue.
***********
Hi Charlie
The Routerport to the SWITCH and the SWITCHport to the router are trunked?
One Router subnetz one VLAN.
The physical connection is ok, both ports has no errors?
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тАО06-05-2006 08:18 PM
тАО06-05-2006 08:18 PM
Re: Router on a Stick HP2554 vs. 1721
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тАО06-06-2006 02:39 AM
тАО06-06-2006 02:39 AM
Re: Router on a Stick HP2554 vs. 1721
I swapped out the switch with new 2600 series and it's appears to be doing the same thing.
Oh well, I'm just going to ditch the HP and buy a 4 port Fa wic for the 1721. I'll let you know if that fixes it.
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тАО06-06-2006 06:55 PM
тАО06-06-2006 06:55 PM
Re: Router on a Stick HP2554 vs. 1721
Your Cisco needs then only an interface/Subnet to the SWITCH with the other vlans/subnets.
That should be able be done.
Carsten
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тАО06-07-2006 12:32 AM
тАО06-07-2006 12:32 AM
Re: Router on a Stick HP2554 vs. 1721
http://www.hp.com/rnd/support/faqs/8000_4000_2424.htm#question27
You say that when you ping behind the router that is when you see the pings drop. When you ping behind the switch it is okay. To me this indicates that the config on the router and switch are okay on that side... possibly the issue is on that other side behind the router.
Have you tried doing any packet captures to see exactly where these first few packets are getting dropped? It sounds like the problem is occuring during ARP resolution, which is why the first few get dropped and presumably after that they all go through fine once the router has the correct ARP information.
Matt
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тАО06-07-2006 03:22 AM
тАО06-07-2006 03:22 AM
Re: Router on a Stick HP2554 vs. 1721
New info, it turns out the pings dropping have nothing to do with where you are pinging from. Sometimes you start a ping from a workstation and every one goes through quickly. Then you do it again a few min later and they will drop. Had another person ping and his were dropping while mine were flying through. This does smack of a mac or arp caching issue to me.
Switch:
; J4813A Configuration Editor; Created on release #F.05.17
hostname "xxxxxxxx"
snmp-server contact "someone@somewhere"
cdp run
console inactivity-timer 120
interface 21
speed-duplex 10-full
exit
ip default-gateway 175.16.162.1
sntp server 10.5.0.1
timesync sntp
sntp unicast
snmp-server community "public" Unrestricted
snmp-server community "something" Unrestricted
vlan 1
name "DEFAULT_VLAN"
untagged 1-20,22-26
ip address a*** ****
no untagged 21
[24;1H [2K-- MORE --, next page: Space, next line: Enter, quit: Control-C [24;1H [24;1H [2K [24;1H [1;24r [24;1H exit
vlan 2
name "VLAN2.349"
tagged 18
exit
vlan 3
name "VLAN3.349"
untagged 21
ip address b*** ****
tagged 18
exit
no aaa port-access authenticator active
############
ROuter:
interface FastEthernet0
description connected to Theater Local HP Switch
no ip address
no ip redirects
no ip unreachables
no ip proxy-arp
ip virtual-reassembly
ip route-cache flow
ip policy route-map EIGRPdeny
speed auto
no keepalive
!
no interface FastEthernet0.1
description default VLAN$ETH-LAN$
encapsulation dot1Q 1 native
ip address a**** ****
ip access-group 110 in
ip access-group 110 out
ip helper-address ****
no snmp trap link-status
no cdp enable
!
no interface FastEthernet0.2 (disabled/currently unused)
description 802.1q port to Theater$FW_INSIDE$
encapsulation dot1Q 2
ip helper-address ****
shutdown
no snmp trap link-status
no cdp enable
!
no interface FastEthernet0.3
description 802.1q port to NCM DCN LAN$ETH-LAN$
encapsulation dot1Q 3
ip address b*** **** ip access-group 111 in
ip access-group 111 out
no ip redirects
no ip unreachables
no ip proxy-arp
ip inspect SDM_LOW out
ip ips sdm_ips_rule in
ip virtual-reassembly
ip policy route-map VSATEIGRPdeny
no ip mroute-cache
no snmp trap link-status
no cdp enable
P.S. the only thing on vlan 3 is one device doing a multicast stream. The 2600 i replaced the 2500 with locked up the other night. Swapped the 2500 back and its back to the normal not working systmes, meaning pings drop but the site is half functional, just slow.
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тАО06-07-2006 11:37 AM
тАО06-07-2006 11:37 AM
Re: Router on a Stick HP2554 vs. 1721
Possibly enable that VLAN and assign an untagged port on the 2524 to test with if you haven't done so already.
I'm starting to feel that there may be another device on the network that has the same IP address as the router's VLAN 1 interface. It would explain just about everything.
On the clients on that site, do a 'arp -a' and make sure that the Router IP address is matching to the correct mac-address. If you're remote you won't be able to see this yourself, you will need some onsite to check this. By the time that you would have connected through to the machine, the mac-address of the router would be in use.
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тАО06-08-2006 02:36 AM
тАО06-08-2006 02:36 AM