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- About mark-obrien
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Member since
10-16-2002
363
Posts
119
Helpful
24
Solutions
11-16-2005
02:08 PM
Check the config of the router to see if there is an access-class under the "line vty x y". An access-class refers to an ACL which specifies permissions to access the router. HTH Mark
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Created by
mark-obrien
in Other Network Architecture Subjects
in Other Network Architecture Subjects
11-11-2005
04:54 PM
11-11-2005
04:54 PM
Actually both fast ethernet interfaces on Router 2 are showing several state changes. Check to see that the switch ports that connect to Router 2 are operating at 100/full, and see if those switch ports and the fast ethernet interface show high amounts of errors. Interestingly, Router 1 reports that the state last changed over a year ago. Good Luck, Mark
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10-29-2005
09:49 AM
Are the virtual terminal lines configured on r1? Look for the following in r1's config: line vty 0 4 password xxx Without this the router can not accept telnet connections. Mark
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10-29-2005
09:00 AM
1. The MAC address of the router is used. 2. Straight-through. 3. Erased. 4. Datalink. 9. Identification between the local router and the connected frame relay switch. 9. Multicasting can cause congestion if there is more packets sent than the capacity of the network, same as any other type traffic. However, multicasting will cause less congestion than sending the same packet individually several times as a unicast. 10. Trunk ports may be configured on routers in "router-on-a-stick" scenarios. Configure sub-interfaces on the fast/gigabit-ethernet interface with encapsulation of "isl (vlan#)" or "dot1q (vlan#)". 11. I have never run across a limit of loopback interfaces, but as with any software product, there must be some limit. I've got to go. I will answer the rest of your questions when I get back. Mark.
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Created by
mark-obrien
in Application Networking
in Application Networking
02-18-2005
09:51 AM
02-18-2005
09:51 AM
Gilles, I was able to sniff three segments simultaneously. Two of these segments were between the client and the CSM and the third was the server VLAN. I did see the same "fragmentation needed" packet in each segment, and the IP header of the packet in the server VLAN did have the destination address changed to that of the real server. However, the body of the fragmentation needed message included the source address of the virtual server. The real server, thinking that the message did not apply to itself, did not perform the necessary reduction of segment size. Is there a way to make the CSM change the source address of an offending packet in the body of an "ICMP Unreachable - Fragmentation Needed" message? Mark
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Created by
mark-obrien
in Application Networking
in Application Networking
02-09-2005
06:16 AM
02-09-2005
06:16 AM
Thank you, Gilles.
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02-08-2005
02:27 PM
If a CSM receives a "Destination Unreachable - Fragmentation needed and DF set" ICMP message, does it pass the packet along, after changing the destination address, to the real server that sent the offending packet? Thanks in advance.
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Labels:
Created by
mark-obrien
in Other Network Architecture Subjects
in Other Network Architecture Subjects
12-27-2004
07:08 AM
12-27-2004
07:08 AM
You can use the Interface range command: interface range fa0/1 - 24 spanning-tree portfast Be careful that no switches are connected to ports within the range. Good luck Mark
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Created by
mark-obrien
in Other Network Architecture Subjects
in Other Network Architecture Subjects
08-28-2004
07:54 AM
08-28-2004
07:54 AM
Amber lights indicate a physical problem with a port. Ports that are blocking in spanning tree have no physical problem, therefore they will not be amber. Good luck. Mark
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Created by
mark-obrien
in Other Network Architecture Subjects
in Other Network Architecture Subjects
08-28-2004
07:46 AM
08-28-2004
07:46 AM
Look for a power adaptor that provides nominally -48 VDC. Make sure that it will provide at least 39 Watts (you can get more Watts, but not less). Buy some 14 AWG wire and connect positive on the power supply to positive on the router, negative to negative and ground to ground. Check Radio Shack or a local hardware store. (Not responsible for houses burning, personal injury, or things exploding, follow local electrical code.) Good luck. Mark
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Created by
mark-obrien
in Other Network Architecture Subjects
in Other Network Architecture Subjects
08-28-2004
07:33 AM
08-28-2004
07:33 AM
Sorry, but what you've shown here indicates that telco is correct (now anyway, but not at first) about everything except, perhaps, the DLCIs that are present, and this can be worked around. Joe Freeman suggested you turn on CDP. This, in addition to configuring IP addresses on each of your physical interfaces, will allow you to map DLCIs to those IP addresses using "show frame-relay map" and "show cdp neighbor detail". Once you have the DLCI-to-IP mappings, you can use this information to build whatever sub-interfaces you want. Good luck. Mark
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Created by
mark-obrien
in Other Network Architecture Subjects
in Other Network Architecture Subjects
08-08-2004
05:28 AM
08-08-2004
05:28 AM
The 3550 has a connected route to 192.168.11.0/26, so the default gateway is not involved. It ARPs directly for 192.168.11.5, and send the echo request, with both the MAC destination and IP destination set to those of the host. For the echo reply, the host recognizes 192.168.11.4 as being on its subnet, so it also doesn't involve the default gateway. The reply is sent with the MAC destination and IP destination (192.168.11.4) of the 3550. When 192.168.99.2 pings 192.168.11.5, the packet gets to the 3550, and again the 3550 sends the packet directly to 192.168.11.5. However, that host, recognizing that 192.168.99.2 is not on its subnet, sends the reply to its default gateway. The default gateway does not have 192.168.99.2, or a subnet containing that address, in its routing table, so the reply never gets back to 192.168.99.2. Mark
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Created by
mark-obrien
in Other Network Architecture Subjects
in Other Network Architecture Subjects
08-08-2004
05:05 AM
08-08-2004
05:05 AM
Jide, Will these incoming calls be completed using modems or as data calls on the B channels? Mark
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Created by
mark-obrien
in Other Network Architecture Subjects
in Other Network Architecture Subjects
08-07-2004
03:11 AM
08-07-2004
03:11 AM
Norman, I'm sorry, I mis-typed the static route that the internet router will need. Instead of "ip route 192.168.99.0 255.255.255.0 192.168.22.4" in the internet router, that needs to be "ip route 192.168.99.0 255.255.255.0 192.168.11.4". Here's what is happening. The ping packet from 192.168.99.2 to 192.168.11.5 goes from that host to the host's default gateway, 192.168.99.1. The C3550 has a connected route to 192.168.11.0/26, and sends the packet directly to that host. 192.168.11.5 sends its response, with destination address 192.168.99.2, towards its default gateway, 192.168.11.1, or the internet router. That router has no route to 192.168.99.2 (thanks to my prevous mistake). If you put the static route in that I gave above, it should work. HTH Mark
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Created by
mark-obrien
in Other Network Architecture Subjects
in Other Network Architecture Subjects
08-06-2004
05:29 PM
08-06-2004
05:29 PM
The C3550 does not need the route pointing 192.168.11.0 255.255.255.192 to 192.168.11.4. This is a connected route and the C3550 knows how to get there without a static pointing to itself. You have not given any information about the router with the IP address 192.168.11.1, but this router needs the static route "ip route 192.168.99.0 255.255.255.0 192.168.22.4" in order for the packets to get back to the C3550. Hope this helps, Mark
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11-16-2005
Check the config of the router to see if there is an access-class under
the "line vty x y". An acces...
Created by
mark-obrien
in Other Network Architecture Subjects
11-11-2005
11-11-2005
Actually both fast ethernet interfaces on Router 2 are showing several
state changes. Check to see t...
10-29-2005
Are the virtual terminal lines configured on r1? Look for the following
in r1's config:line vty 0 4 ...
Created by
mark-obrien
in Routing
10-29-2005
10-29-2005
1. The MAC address of the router is used.2. Straight-through.3.
Erased.4. Datalink.9. Identification...
02-18-2005
Gilles,I was able to sniff three segments simultaneously. Two of these
segments were between the cli...
02-08-2005
If a CSM receives a "Destination Unreachable - Fragmentation needed and
DF set" ICMP message, does i...
Created by
mark-obrien
in Other Network Architecture Subjects
12-27-2004
12-27-2004
You can use the Interface range command:interface range fa0/1 - 24
spanning-tree portfastBe careful ...
Created by
mark-obrien
in Other Network Architecture Subjects
08-28-2004
08-28-2004
Amber lights indicate a physical problem with a port. Ports that are
blocking in spanning tree have ...
Created by
mark-obrien
in Other Network Architecture Subjects
08-28-2004
08-28-2004
Look for a power adaptor that provides nominally -48 VDC. Make sure that
it will provide at least 39...
Created by
mark-obrien
in Other Network Architecture Subjects
08-28-2004
08-28-2004
Sorry, but what you've shown here indicates that telco is correct (now
anyway, but not at first) abo...
Created by
mark-obrien
in Other Network Architecture Subjects
08-08-2004
08-08-2004
The 3550 has a connected route to 192.168.11.0/26, so the default
gateway is not involved. It ARPs d...
08-08-2004
Jide,Will these incoming calls be completed using modems or as data
calls on the B channels?Mark
Created by
mark-obrien
in Other Network Architecture Subjects
08-07-2004
08-07-2004
Norman,I'm sorry, I mis-typed the static route that the internet router
will need. Instead of "ip ro...
Created by
mark-obrien
in Other Network Architecture Subjects
08-06-2004
08-06-2004
The C3550 does not need the route pointing 192.168.11.0 255.255.255.192
to 192.168.11.4. This is a c...
Public Statistics
| Date Registered | 10-16-2002 11:09 AM |
| Date Last Visited | 08-18-2017 03:51 AM |
| Total Messages Posted | 363 |
| Total Helpful Votes Received | 119 |
