A tag for discussion of "routing", the process of selecting which network path to send traffic to.
0
votes
2answers
73 views
Weird TCP ports open on remote host, Apple Airport Extreme, my network only [closed]
I'm getting strange results for open ports on internet hosts on my network. I suspect some kind of weird router behavior, but I can't really figure out what it is.
NMAP from my workstation (on my ...
5
votes
1answer
63 views
Why there is a maximum of 4096 queues in WFQ?
In QoS there is a variety of Queuing methods and one of them is WFQ, which organizes the flows in different queues where each queue has a weight that determines which flow will go first.
Now for ...
6
votes
1answer
63 views
BGP remote-triggered blackhole (RTBH) filter for Juniper
I'm trying to find the most elegant way to implement a RTBH filter for routes received from a customer.
The filter should:
Only accept the customers own prefixes from a prefix-list
Only accept /32 ...
3
votes
1answer
85 views
Routing table in QNX
I've an embedded system running on QNX 6.2.1. (I'll call it QNX box.) The QNX box has two network adaptors. I've configured the driver, so they appear as en0 and en1. Here are their IP settings:
...
6
votes
2answers
79 views
Reliable connectivity to China
I have been struggling on getting reliable connectivity to China (AS4837 China Unicom Backbone, AS4134 China Telecom Backbone, AS4538 China Education and Research Network Center)
On most links I have ...
5
votes
3answers
112 views
Inbound BGP load-balancing from same ISP router
I have two BGP routers for DIA with an issue with one provider in that the two links to this provider land on the same SP router. My ethernet handoffs via two separate MetroE links from another ...
2
votes
1answer
75 views
Isolating Juniper Management Plane
Out of the box, it seems that the Juniper management routing is part of the default route table. Can I use logical systems to isolate the service plane from management routing? Are there any ...
2
votes
2answers
65 views
Setting the same gateway address at a DR site as our main site
I have a question about routed traffic across a site to site VPN between 2 Cisco ASA 5510's. We have our office side and our DR side and the question is could I have an IP conflict of gateway IP ...
4
votes
4answers
115 views
USA proxy IP in a box [closed]
My boss, US expat, is requesting a solution to watch his US TV shows and other content while he is staying here (small European country you probably never heard of). As I think, the ideal solution ...
9
votes
2answers
297 views
RIP routing is broken between two routers
There are 2 routers connected something like this:
Network1 ----- (172.16.1.1/24) Router 1 (172.16.3.1/30) ------ (172.16.3.2/30) Router 2 ------ (172.16.2.1/24) Network 2
I try to add addresses ...
10
votes
3answers
203 views
CEF operations on L3 switch vs router
I understand that L3 switches use CEF for faster packet forwarding. However, CEF will not work for packets that need to undergo NAT. Does this mean CEF isn't used by edge routers and edge L3 switches? ...
9
votes
3answers
133 views
Circular BGP propagation
This one is a difficult to describe, it's hypothetical because I'm learning about routing and right now I'm focused on BGP.
Let's say my ASN is 6500, and I announce 1.0.0.0/8. My peer, AS 6501 ...
7
votes
3answers
117 views
Default-network and default-gateway
When would you choose to use the ip default-network command instead of the ip default-gateway command?
6
votes
1answer
130 views
What factors drive L2 vs L3 in the access layer?
When designing an access layer, best practices today seem to indicate going toward a L3 design. I know the answers may be different depending on whether or not we talking about a DC design or ...
2
votes
2answers
75 views
Is migrating to VRF or rolling-back an easy proposition?
If VRF is implemented for routing table separation such as having an overlay network for a guest network that doesn't mix with regular LAN routing, is migrating to it easily done on Cisco switches ...
3
votes
6answers
87 views
What are the reasons for choosing separate or combined VPN and Internet routers?
Here's a network design question: I've just been reading "IPv6 for Enterprise Networks" by McFarland et. al. and it (among other Cisco documents) separates out Internet routing from remote access VPN. ...
5
votes
3answers
50 views
How to apply configuration after replacing Routing Engine(RE) for CISCO7609-S?
Senario:
I have the backup configuration file. But I don't any USB drive or compact flash card. After replacing the Routing Engine, I tried to copy/paste the configs (around 12k lines) from the ...
11
votes
1answer
237 views
What is the difference between a VRF and GRF? (cisco)
I've heard about VRF's and GRF's, but was is the difference between those 2? (cisco)
2
votes
7answers
166 views
Dynamic Routing Protocol (IGP) over IPSec VPN tunnels to branch offices?
What are the best practices for running an IGP to learn networks at HQ from branch offices when those offices connect via IPSec LAN-to-LAN VPN tunnels over the Internet? The branch offices terminate ...
-3
votes
0answers
47 views
Difference between UPnP on router and Windows 7 PC [closed]
I have dd-wrt netgear router . Upnp service is disabled on it.
I know I can also disable Upnp on my desktop machine by going in services.msc and disabling Upnp device host and SSDP.
I know that if ...
3
votes
2answers
106 views
Adding static routes with metrics in Windows7
I have been trying to add a static route in my windows machine as follows:
C:\Windows\system32>route ADD 10.0.0.25 10.10.10.3 metric 1
OK!
But when I checked the routing table, the metrics of ...
7
votes
6answers
438 views
Best practice for dual-homing site with two ISPs?
I am subscribed to two ISPs, a fast expensive one and a cheap but slower one. They use different technologies, cable and ADSL, so there isn't much of a single point of failure, and all my comms ...
6
votes
1answer
123 views
Remote Campus Routing Design
A third party provider supplies connectivity my remote satellite campus over metro ethernet. Due to red tape the provider is required to supply a routed point-to-point connection (R2 and R3) to the ...
7
votes
3answers
153 views
Cisco: prevent vlan's of communicating with eachother on cisco router (ACL alternative)
Setup: Cisco router with multiple VLAN's configured on it.
How can you prevent 2 VLAN's communicating with eachother? Normally I would do this with ACL's like this:
access-list 102 deny ip 1.1.1.0 ...
4
votes
2answers
68 views
VPN routing for hosts with multiple ip addresses
I use Mikrotik RouterOS as the NAT router. Some hosts behind the router also have a direct connection to the Internet and these hosts have a default route to the ISP's gateway instead of RouterOS.
I ...
8
votes
2answers
148 views
What are the differences between VRRP and HSRP?
Is there any significant difference between VRRP and HSRP?
7
votes
4answers
141 views
Difference between access list and prefix list?
Can someone explain with an example whats the difference between an access list and prefix list.
4
votes
2answers
131 views
BGP - Soft Reset Outbound & Verification
My understanding of the command:
clear ip bgp * soft out
is that the router on which the command is issued will re-advertise everything it knows about BGP to it's neighbors. As I see it, it's as if ...
18
votes
8answers
2k views
How would a router with /32 WAN subnet mask communicate with the rest of the Internet?
I'm studying networking and one of the most basic things I've been told countless times is that computers can't communicate outside of their own subnet.
On the other hand, by looking at some ADSL ...
9
votes
2answers
174 views
Why don't iperf, scamper and path MTU discovery packet captures agree on the path's MTU?
Let's do some path MTU discovery between two Debian hosts separated by a Debian router that runs Shorewall-generated iptables rules. Each of the two hosts uses a single Ethernet link while the router ...
5
votes
2answers
168 views
Policy routing configuration in Fortigate
I have an scenario where a Fortigate firewall is used to separate internal networks from the Internet (FortiOS Version 4.0 MR3 patch 11). Right now there is a single Internet connection attached to ...
6
votes
4answers
230 views
Distributing static routes across an OSPF area
If you have a router which does not support OSPF, but your routing topology makes use of OSPF as all other devices do support it, what is the best way to get this routers networks in to the OSPF area?
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8
votes
3answers
144 views
Routing with seperate WAN link for backups
We have two geographically separate data centers. We are preparing to implement a new WAN connection (dark cloud) that would be used only for backup traffic. The servers will have two NIC cards ...
