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1500 questions
6
votes
3 answers
Does NAT violate end to end argument?
Does NAT violate end to end argument?
What does end to end argument means in this context?
Rumesh Madhusanka
- 425
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6
votes
3 answers
CIDR and VLSM what are the differences?
CIDR improves the allocation of IP addresses. VLSM allows to define a subnet as we wish. Can CIDR used without using VLSM?
Rumesh Madhusanka
- 425
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- 11
6
votes
2 answers
Juniper SRX240 Clustering - Policy out of sync
I have two Juniper SRX240's in a cluster. After re-ordering some security policies on the primary device and committing them ok I now can not make any other changes without the warning
error: Policy is out of sync between RE and PFE…
Gareth Hastings
- 860
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- 30
6
votes
2 answers
Show connected (up) interfaces on cisco devices
Is there any way to show a total count of interfaces that are in status "up" on a cisco router?
The purpose is to let a script go through all routers and show a summarization count of "up" interfaces.
Bulki
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6
votes
1 answer
Why do IXPs need ASN?
Does anybody know why an IXP needs to have an ASN? Will that ASN appear in the AS-PATHs or will it be transparent?
konstantinosAR
- 179
- 6
6
votes
2 answers
MPLS can reroute, but can it route?
I have 4 Cisco routers, connected one to another like the following:
**R1**(s1/0)--(s1/0)**R2**(s1/1)--(s1/0)**R3**(s1/1)--(s1/0)**R4**
All of them have an IP address assigned on their interfaces. There is a route between R1 and R2, and a route…
Vulpo
- 243
- 2
- 5
6
votes
2 answers
Traffic from route-map to crypto-map
This is sort of an offshoot of my previous question Ipsec vpn, phase 2 unable to come up. The VPN is up and working but now I'm having an issue with getting the right traffic across it.
The only thing I want to go across it is port 80 traffic. I…
TheEditor
- 353
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6
votes
1 answer
How to use an optical tap? Which fiber should I use?
We have an optical tap (https://www.fs.com/products/73675.html) that provides an LC connector providing two TX instead of RX/TX.
As you can see, there is a conflict.
What I think I need:
A splitter from one LC connector RX/TX to two LC connectors…
無名前
- 408
- 3
- 15
6
votes
2 answers
Why do transport layer do data chunking. If there is fragmentation in Network Layer
I just curiously wanted to know about the question regarding L4, L3 Data Chunks, IP Fragmentation :
Data chunking happened at Layer 4(Transport, TCP), and
Fragmentation at Layer 3(Network, ipv4)
According to Wikipedia, data chunk happens at L4:…
user60007
6
votes
1 answer
What is the jsrv.1 interface for?
I have a Juniper EX2200 switch running JunOS 10.4R4.5.
Under Configure -> System Properties -> Management Access, I can configure which interface allow management access. There is a mystery interface call jsrv.1.
jsrv.1 is not listed in the…
myron-semack
- 225
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6
votes
3 answers
Sending less data than the TCP buffer could take
The accepted answer of this question explains:
When you send data, your TCP buffers it. So if you send a character it won't send it immediately but wait to see if you've got more.
But what if I don't have that much data to send? How does TCP…
TimSch
- 161
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- 4
6
votes
1 answer
Cisco 3750X Power Cable
I received a Cisco 3750X the other day. I went to go plug it in for testing and found that the standard three prong female power connector is no longer compatible with the power supply. Cisco has added a notch to their power supply port making the…
Craken
- 681
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6
votes
0 answers
Cisco nexus 9396 rebooted with reason xbar_client
Today my one of cisco nexus 9396PX switch got rebooted and this is what i found, based on following logs what could be wrong? We don't have Cisco support for this switch, trying to see if i can get help from community otherwise last option is…
Satish
- 4,451
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6
votes
1 answer
VPN client to multiple locations simultaneously
I need to connect to 15+ locations to run network scans weekly. All the locations have Fortigate firewalls over which I have full control. The current solution I have is to connect via IPSec VPN to each location one by one to run my scans. I have…
freb
- 163
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6
votes
2 answers
Change Ping Response for Traffic Blocked by Access Control List
I am trying to ping a host, let's say 10.1.1.1, from 20.1.1.1.
I have created the ACL:
R1(config)#access-list 1
R1(config)#Deny 20.1.1.1
R1(config)#Permit any
R1(config)# int s0/0
R1(config-if)#ip access-group 1 in
Never mind the configuration, I…
user3146180
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