Linux, FreeBSD, Juniper, Cisco / Network security articles and troubleshooting guides

**Posted:** Tue Nov 25, 2014 9:08 pm

Router model: Linksys WRT1900AC This is a 4-antenna 2.4 / 5.0 Ghz router.

The issue that I'm having is rather simple, though, I thought I would share the question out here on this forum for experts to answer from their own experiences with the problem I'm facing. I'm sure there is some way to do this, so can I receive a few replies please from different people?

This evening I set up a bridge with ...

**Posted:** Sun Jun 10, 2012 3:33 pm

FreeBSD TCP stack behavior for one connection under sockstress flood (zero window attack):

15:10:18.794551 IP 10.1.23.2.64980 > 10.1.22.3.80: S 246816765:246816765(0) win 59395 <eol> ---> SYN
15:10:18.796141 IP 10.1.22.3.80 > 10.1.23.2.64980: S 2890464131:2890464131(0) ack 246816766 win 65535 <mss 1460> ---> SYN+ACK
15:10:18.796167 IP 10.1.23.2.64980 > 10.1.22.3.80: . ack 1 win 0 <eol> ---> ACK (Zero window)
15:11:18.798688 IP 10.1.22.3.80 > 10.1.23.2.64980: F 1:1(0) ack 1 win 65535 ---> FIN
15:11:18.798717 IP 10.1.22.3.80 > 10.1.23.2.64980: F ...

**Posted:** Sun Jul 25, 2010 10:28 am

This topic is purposed for discussions on the new DNS & Network tools: http://dnstools.ivorde.ro

http://dnstools.ivorde.ro - DNS queries & Network Tools (PING and Traceroute)

**Posted:** Fri Jun 11, 2010 10:56 am

When having IP aliases on one interface, by default, the kernel will choose the main IP as a source. Example:

Code:

server# ip a l bond1
3: bond1: <BROADCAST,MULTICAST,MASTER,UP> mtu 1500 qdisc noqueue
    link/ether 00:0e:0c:6f:25:a1 brd ff:ff:ff:ff:ff:ff
    inet 168.22.13.11/24 brd 172.22.11.255 scope global bond1
    inet 168.22.13.15/32 scope global bond1
server# ip ro get 10.1.1.1
10.1.1.1 via 168.22.13.254 dev bond1  src 168.22.13.11
    cache  mtu 1500 advmss 1460 hoplimit 64

Changing a route (in this case, ...

**Posted:** Wed May 26, 2010 11:14 am

1. Define the FTP user and password

Code:

CISCO#conf t
Enter configuration commands, one per line.  End with CNTL/Z.
CISCO(config)#ip ftp username my_username
CISCO(config)#ip ftp password my_password

2. Find the file that you wish to upload

Code:

CISCO# dir
Directory of disk0:/

    1  -rw-    20744144   Feb 4 2000 20:48:26 +01:00  c7301-itpk9-mz.124-11.SW3.bin
    3  -rw-          75  Mar 28 2008 13:26:50 +01:00  pc-route-table
    4  -rw-         132  Mar 21 2008 09:00:14 +01:00  gtt-route-table

3. Upload the file
CISCO#copy c7301-itpk9-mz.124-11.SW3.bin ftp:
Address ...

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