tonusoo

tonusoo

root@bird1:~# # acknowledgements to the client(10.10.10.1) are withheld until the hot backup has received the corresponding data
root@bird1:~# tshark -c 4 -i enp7s0 -f 'tcp and port 179'
Running as user "root" and group "root". This could be dangerous.
Capturing on 'enp7s0'
    1 0.000000000   10.10.10.1 → 10.10.10.0   BGP 85 KEEPALIVE Message
    2 0.601193559   10.10.10.0 → 10.10.10.1   TCP 66 179 → 60153 [ACK] Seq=1 Ack=20 Win=16384 Len=0 TSval=2273170037 TSecr=1268402651
    3 4.135022182   10.10.10.0 → 10.10.10.1   BGP 85 KEEPALIVE Message
    4 4.135067259   10.10.10.1 → 10.10.10.0   TCP 66 60153 → 179 [ACK] Seq=20 Ack=20 Win=126 Len=0 TSval=1268406786 TSecr=2273173570
4 packets captured
root@bird1:~#

tonusoo

#!/usr/bin/env bash

# Configures Juniper router to inject a 0x0b control character to
# "Shutdown Communication" field(RFC 9003) of a BGP cease NOTIFICATION message.
#
# Usage example:
# ./shutdown-bgp-session.bash | ssh [email protected] -p 830 -s netconf


vertical_tab=$'\v'

tonusoo

--- net/ipv6/route.c~   2025-08-08 13:44:04.928000000 +0300
+++ net/ipv6/route.c    2025-08-08 13:48:01.448000000 +0300
@@ -2221,24 +2221,13 @@
 int fib6_table_lookup(struct net *net, struct fib6_table *table, int oif,
                      struct flowi6 *fl6, struct fib6_result *res, int strict)
 {
-       struct fib6_node *fn, *saved_fn;
+       struct fib6_node *fn;

        fn = fib6_node_lookup(&table->tb6_root, &fl6->daddr, &fl6->saddr);

tonusoo

qemu-nbd --connect=/dev/nbd0 vJunos-router-23.2R1.15.qcow2
fdisk -l /dev/nbd0
mkdir -p /tmp/nbd0p2
mount -v /dev/nbd0p2 /tmp/nbd0p2
qemu-nbd --connect=/dev/nbd1 /tmp/nbd0p2/home/pfe/junos/junos-virtual-x86-64-23.2R1.15.qcow2
mkdir -p /tmp/nbd1p3
mount -t ufs -v -o ro,ufstype=44bsd /dev/nbd1p3 /tmp/nbd1p3
cp -v /tmp/nbd1p3/boot/loader.rc .
umount /tmp/nbd1p3
qemu-nbd --disconnect /dev/nbd1

tonusoo

[edit policy-options]
+   prefix-list DC1-aggregate {
+       10.10.0.0/23;
+   }
[edit policy-options]
+   policy-statement ISP-B-out-v4 {
+       term conditional-announcement {
+           from {
+               prefix-list DC1-aggregate;
+               condition conditional-announcement;

tonusoo

#!/usr/bin/env bash

# Find IPv4 prefixes which have non-unique origin AS number, i.e. the rightmost AS number.

get_origin_asn() {

    last_asn_elem="${1##* }"
    case "$last_asn_elem" in
        "{"*"}")
            # It's an AS-set.

tonusoo

BGP full feed in lab environment with gobgpd and BIRD

Prefixes are injected with patched gobgp. Systemd service template for gobgpd processes:

martin@bgp-feed:~$ cat /etc/systemd/system/[email protected]
[Unit]
Description=GoBGP Routing Daemon - instance %i
After=network.target syslog.service
ConditionPathExists=/usr/local/etc/gobgpd-%i.conf

tonusoo

#!/usr/bin/env bash

# Title               : systemd-networkd-confgen
# Last modified date  : 8.02.2024
# Author              : Martin Tonusoo
# Description         : Script manages systemd-networkd conf files
#                       with "[IPv6Prefix]" and "[IPv6SendRA]" configuration
#                       sections in /run/systemd/network/10-br0.network.d/
#                       directory. "[IPv6Prefix]" configuration is built based
#                       on the content of the files in /run/prefix-capture/

tonusoo

--- bgp_simple.pl~      2024-11-27 12:26:17.057483859 +0200
+++ bgp_simple.pl       2024-11-27 14:46:48.435675124 +0200
@@ -16,6 +16,8 @@
 use Net::BGP;
 use Net::BGP::Process;

+STDOUT->autoflush(1);
+
 my $version = "v0.12";
 my $version_date = "22-Jan-2011";