3,981 reputation
918
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location London, United Kingdom
age 43
visits member for 5 years, 6 months
seen Nov 25 at 16:54
Quite boring, really. Have faffed about with computers since the mid-80s, have worked as a network engineer, unix sysadmin and (occasionally) developer.

Jan
8
comment Does Removing a WIC from a Cisco router ever effect the Saved Configuration?
If I'd been able to give an extra +1 for "also copy the config off to somewhere else", I would've, as is I could only give one +1 for the general answer.
Jan
8
comment Cisco IOS: access-list logging rate-limited or missed packets
I believe that is a minimum time between ACL log messages. Basically, you need to allow more log messages to be generated. But, the 871 is not the fastest hardware platform around and I don't know if "have ACL" directly implies "process-switched" or not. You may actually be on the limit of what your hardware can do.
Jan
7
comment Is Internet routing (BGP) fully automated?
RIPE also publishes RR-set information (essentially AS-owner-edited information on each As's routing policy, tehre are automatic tools to build ACL rules to ensure that the routes you accept in correspon exactly to the published RR-set policy, adding another layer of protection for your routing).
Jan
3
comment BVI vs Bridge routers
@GeorgeBailey If you have an interface BVI17, all interfaces with "bridge-group 17" will be in the same group and BVI17 will provide the L3 connectivity.
Dec
23
comment Latency in TCP/IP-over-Ethernet networks
And if you're relying on jumbo frames, remember that you'll need to have jumbo frames enabled end-to-end to get any benefit from them...
Dec
23
comment Sending a UDP message to a computer inside a network
Er? That doesn't make sense, you seem t obe treating L2 addressing (MACs) like L3 addressing (in this case, NAT). The source MAC is always replaced on forwardíng through an L3 device (but shouldn't be, when sent through an L2 device).
Dec
22
comment Ethernet: network topology
Well, all ports except the ingress port, typically.
Dec
22
comment Forward differing hostnames to different internal IPs through NAT router
I think this might work, but you MAY be in for a surprise if people contact your reverse proxy and do assorted "nasty" things to it.
Dec
22
comment Is it feasible to poll traffic readings from Cisco switches more often than every five minutes?
As a general rule, if your Cisco kit hits somewhere between 50% and 60% as "average CPU", you're looking at a bit of a surprise, next time there's a perfect packet storm (as in "watchdog timer triggered, causing platform to reboot").
Dec
4
comment Dropped packets in Linux
@joris: As long as you remember that any "loss" or "slowness" seen in the middle of the trace, exceeding that to the end, is down to how intermediate routers respond to ICMP... I've had more than one "fault" reported because people can't properly interpret MTR reports.
Dec
2
comment Different ways to shut down a system
Don't forget "kill -9 1" on most unixoid systems (read that as "it has worked to shut the system down on all I've tried it on", but I admit I havent tried it for QUITE a few years).
Nov
30
comment Attempting to find a device from MAC/IP
The same port showing up with multiple MAC addresses indicate that you have hubs or switches out of of those ports.
Nov
25
comment Rackmount cable length calculations & best practices
One possibility would be to have a long piece of cable, with an TJ-45 connector at one end, having marked distances for each "standard" cable length you have. This would allow you to find the distance needed with something having the exact properties of a cable, routed "properly" and would probably lead to a good intuition for the required lengths after few iterations.
Nov
25
comment How to find a rogue machine on your network with the wrong ip address
you can (probably) run "show mac-address-table address 2222.aaaa.bbbb" (or "sh mac addr ...", as I usually shorten IOS commands, relying on the CLI parser to do its job), instead of filtering.
Nov
24
comment Is NAT the same as a Routing with DHCP in the virtual VMnet 8 (NAT) in VMWare?
And DHCP is a method of providing address, default gateway, DNS and other information.
Nov
15
comment Why does 1GBit card have output limited to 80 MiB?
Erm, no. If the other end was running at 10 Mbps, you'd be unable to push more than about 1.2 MB/s (slightly less, in fact) and if it was running 100 Mbps, you'd be looking at a peak somewhere in the 11.9 MB/s range. "Gig ethernet" is not "gigabyte", it's "gigabit" (and it's a "base 10" gig, at that, so 10^9, not 2^30).
Nov
12
comment init.d scripts written in Python
@Zoredache - Ayup. Typically, you know that "has happened" when you're late in the "multi-user" RC sequence.
Nov
10
comment how to resolve connection problem at network
That Depends... What's the other end running? What protocol are you using? If it's HTTP, what you can or cannot search for depends on the installed web server. If it's Windows file-sharing, you'll need to look into the Samba suite. But, the error message you're getting looks to be network-related, so that needs to be resolved. It could just be an error message indicating that whatever you're expecting to be running on the remote end isn't.
Nov
9
comment How can I troubleshoot excessive latency between client and server?
Depends on how "from the ground up" you want to go. I'd, personally, start by doing a tcpdump of a request/response pair, see if there are any associated requests going out from the server and take it from there. Bit hard to say, though, without knowing the application, at all.
Nov
8
comment How can I troubleshoot excessive latency between client and server?
The interesting bit isn't if the client end has DNS issues, it's if the server end has it.